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437 lines
10 KiB
C
437 lines
10 KiB
C
/*---------------------------------------------------------------------------*\
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========= |
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\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
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\\ / O peration |
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\\ / A nd | Copyright (C) 1991-2010 OpenCFD Ltd.
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\\/ M anipulation |
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-------------------------------------------------------------------------------
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License
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This file is part of OpenFOAM.
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OpenFOAM is free software: you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with OpenFOAM. If not, see <http://www.gnu.org/licenses/>.
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\*---------------------------------------------------------------------------*/
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#include "commonRailInjector.H"
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#include "addToRunTimeSelectionTable.H"
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#include "mathematicalConstants.H"
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// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
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namespace Foam
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{
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defineTypeNameAndDebug(commonRailInjector, 0);
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addToRunTimeSelectionTable
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(
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injectorType,
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commonRailInjector,
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dictionary
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);
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}
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// * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * //
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Foam::commonRailInjector::commonRailInjector
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(
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const Foam::Time& t,
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const Foam::dictionary& dict
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)
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:
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injectorType(t, dict),
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propsDict_(dict.subDict(typeName + "Props")),
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position_(propsDict_.lookup("position")),
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direction_(propsDict_.lookup("direction")),
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d_(readScalar(propsDict_.lookup("diameter"))),
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mass_(readScalar(propsDict_.lookup("mass"))),
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injectionPressure_(readScalar(propsDict_.lookup("injectionPressure"))),
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T_(readScalar(propsDict_.lookup("temperature"))),
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nParcels_(readLabel(propsDict_.lookup("nParcels"))),
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X_(propsDict_.lookup("X")),
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massFlowRateProfile_(propsDict_.lookup("massFlowRateProfile")),
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velocityProfile_(massFlowRateProfile_),
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injectionPressureProfile_(propsDict_.lookup("injectionPressureProfile")),
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CdProfile_(massFlowRateProfile_),
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TProfile_(massFlowRateProfile_),
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averageParcelMass_(mass_/nParcels_),
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pressureIndependentVelocity_(false)
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{
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// convert CA to real time
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forAll(massFlowRateProfile_, i)
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{
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massFlowRateProfile_[i][0] =
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t.userTimeToTime(massFlowRateProfile_[i][0]);
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velocityProfile_[i][0] = t.userTimeToTime(massFlowRateProfile_[i][0]);
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}
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forAll(injectionPressureProfile_, i)
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{
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injectionPressureProfile_[i][0] =
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t.userTimeToTime(injectionPressureProfile_[i][0]);
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}
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if
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(
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mag(injectionPressureProfile_[0][0] - massFlowRateProfile_[0][0])
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> SMALL
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)
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{
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FatalErrorIn
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(
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"commonRailInjector::commonRailInjector"
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"(const time& t, const dictionary dict)"
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) << " start-time entries for injectionPressureProfile and "
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<< "massFlowRateProfile do no match"
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<< abort(FatalError);
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}
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Info<< "injectionPressureProfile_.size() = "
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<< injectionPressureProfile_.size()
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<< ", massFlowRateProfile_.size() = " << massFlowRateProfile_.size()
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<< endl;
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if
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(
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mag(injectionPressureProfile_.last()[0]
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- massFlowRateProfile_.last()[0])
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> SMALL
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)
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{
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FatalErrorIn
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(
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"commonRailInjector::commonRailInjector"
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"(const time& t, const dictionary dict)"
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) << "End-time entries for injectionPressureProfile and "
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<< "massFlowRateProfile do no match"
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<< abort(FatalError);
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}
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scalar integratedMFR = integrateTable(massFlowRateProfile_);
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scalar integratedP =
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integrateTable(injectionPressureProfile_)/(teoi() - tsoi());
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forAll(massFlowRateProfile_, i)
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{
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// correct the massFlowRateProfile to match the injected mass
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massFlowRateProfile_[i][1] *= mass_/integratedMFR;
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TProfile_[i][0] = massFlowRateProfile_[i][0];
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TProfile_[i][1] = T_;
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CdProfile_[i][0] = massFlowRateProfile_[i][0];
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}
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forAll(injectionPressureProfile_, i)
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{
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injectionPressureProfile_[i][1] *= injectionPressure_/integratedP;
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}
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// Normalize the direction vector
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direction_ /= mag(direction_);
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setTangentialVectors();
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// check molar fractions
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scalar Xsum = 0.0;
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forAll(X_, i)
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{
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Xsum += X_[i];
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}
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if (mag(Xsum - 1.0) > SMALL)
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{
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WarningIn
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(
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"commonRailInjector::commonRailInjector"
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"(const time& t, const dictionary dict)"
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) << "X does not add up to 1.0, correcting molar fractions."
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<< endl;
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forAll(X_, i)
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{
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X_[i] /= Xsum;
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}
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}
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Info<< "end constructor. in commonRail" << endl;
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}
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// * * * * * * * * * * * * * * * * Destructor * * * * * * * * * * * * * * * //
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Foam::commonRailInjector::~commonRailInjector()
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{}
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// * * * * * * * * * * * * * * * Member Functions * * * * * * * * * * * * * //
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void Foam::commonRailInjector::setTangentialVectors()
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{
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cachedRandom rndGen(label(0), -1);
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scalar magV = 0.0;
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vector tangent;
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while (magV < SMALL)
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{
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vector testThis = rndGen.sample01<vector>();
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tangent = testThis - (testThis & direction_)*direction_;
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magV = mag(tangent);
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}
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tangentialInjectionVector1_ = tangent/magV;
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tangentialInjectionVector2_ = direction_ ^ tangentialInjectionVector1_;
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}
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Foam::label Foam::commonRailInjector::nParcelsToInject
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(
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const scalar time0,
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const scalar time1
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) const
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{
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scalar mInj =
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mass_*(fractionOfInjection(time1) - fractionOfInjection(time0));
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label nParcels = label(mInj/averageParcelMass_ + 0.49);
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return nParcels;
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}
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const Foam::vector Foam::commonRailInjector::position(const label n) const
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{
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return position_;
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}
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Foam::vector Foam::commonRailInjector::position
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(
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const label n,
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const scalar time,
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const bool twoD,
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const scalar angleOfWedge,
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const vector& axisOfSymmetry,
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const vector& axisOfWedge,
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const vector& axisOfWedgeNormal,
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cachedRandom& rndGen
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) const
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{
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if (twoD)
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{
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scalar is = position_ & axisOfSymmetry;
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scalar magInj = mag(position_ - is*axisOfSymmetry);
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vector halfWedge =
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axisOfWedge*cos(0.5*angleOfWedge)
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+ axisOfWedgeNormal*sin(0.5*angleOfWedge);
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halfWedge /= mag(halfWedge);
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return (is*axisOfSymmetry + magInj*halfWedge);
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}
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else
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{
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// otherwise, disc injection
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scalar iRadius = d_*rndGen.sample01<scalar>();
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scalar iAngle = constant::mathematical::twoPi*rndGen.sample01<scalar>();
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return
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(
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position_
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+ iRadius
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*(
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tangentialInjectionVector1_*cos(iAngle)
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+ tangentialInjectionVector2_*sin(iAngle)
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)
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);
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}
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return position_;
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}
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Foam::label Foam::commonRailInjector::nHoles() const
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{
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return 1;
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}
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Foam::scalar Foam::commonRailInjector::d() const
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{
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return d_;
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}
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const Foam::vector& Foam::commonRailInjector::direction
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(
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const label i,
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const scalar time
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) const
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{
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return direction_;
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}
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Foam::scalar Foam::commonRailInjector::mass
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(
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const scalar time0,
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const scalar time1,
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const bool twoD,
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const scalar angleOfWedge
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) const
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{
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scalar mInj =
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mass_*(fractionOfInjection(time1) - fractionOfInjection(time0));
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// correct mass if calculation is 2D
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if (twoD)
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{
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mInj *= 0.5*angleOfWedge/constant::mathematical::pi;
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}
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return mInj;
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}
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Foam::scalar Foam::commonRailInjector::mass() const
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{
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return mass_;
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}
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const Foam::scalarField& Foam::commonRailInjector::X() const
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{
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return X_;
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}
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Foam::List<Foam::commonRailInjector::pair> Foam::commonRailInjector::T() const
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{
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return TProfile_;
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}
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Foam::scalar Foam::commonRailInjector::T(const scalar time) const
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{
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return T_;
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}
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Foam::scalar Foam::commonRailInjector::tsoi() const
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{
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return massFlowRateProfile_.first()[0];
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}
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Foam::scalar Foam::commonRailInjector::teoi() const
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{
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return massFlowRateProfile_.last()[0];
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}
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Foam::scalar Foam::commonRailInjector::massFlowRate
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(
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const scalar time
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) const
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{
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return getTableValue(massFlowRateProfile_, time);
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}
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Foam::scalar Foam::commonRailInjector::injectionPressure
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(
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const scalar time
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) const
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{
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return getTableValue(injectionPressureProfile_, time);
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}
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Foam::scalar Foam::commonRailInjector::velocity
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(
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const scalar time
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) const
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{
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return getTableValue(velocityProfile_, time);
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}
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Foam::List<Foam::commonRailInjector::pair> Foam::commonRailInjector::CdProfile()
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const
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{
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return CdProfile_;
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}
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Foam::scalar Foam::commonRailInjector::Cd
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(
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const scalar time
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) const
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{
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return getTableValue(CdProfile_, time);
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}
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Foam::scalar Foam::commonRailInjector::fractionOfInjection
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(
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const scalar time
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) const
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{
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return integrateTable(massFlowRateProfile_, time)/mass_;
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}
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Foam::scalar Foam::commonRailInjector::injectedMass
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(
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const scalar t
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) const
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{
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return mass_*fractionOfInjection(t);
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}
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void Foam::commonRailInjector::correctProfiles
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(
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const liquidMixture& fuel,
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const scalar referencePressure
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)
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{
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scalar A = 0.25*constant::mathematical::pi*sqr(d_);
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scalar pDummy = 1.0e+5;
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scalar rho = fuel.rho(pDummy, T_, X_);
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forAll(velocityProfile_, i)
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{
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scalar Pinj =
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getTableValue(injectionPressureProfile_, velocityProfile_[i][0]);
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scalar Vinj = sqrt(2.0*(Pinj - referencePressure)/rho);
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scalar mfr = massFlowRateProfile_[i][1]/(rho*A);
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scalar Cd = mfr/Vinj;
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velocityProfile_[i][1] = Vinj;
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CdProfile_[i][1] = Cd;
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}
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}
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Foam::vector Foam::commonRailInjector::tan1(const label n) const
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{
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return tangentialInjectionVector1_;
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}
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Foam::vector Foam::commonRailInjector::tan2(const label n) const
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{
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return tangentialInjectionVector2_;
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}
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// ************************************************************************* //
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