src/lagrangian/dieselSpray/injector/commonRailInjector/commonRailInjector.C

   1 /*---------------------------------------------------------------------------*\
   2   =========                 |
   3   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   4    \\    /   O peration     |
   5     \\  /    A nd           | Copyright (C) 1991-2009 OpenCFD Ltd.
   6      \\/     M anipulation  |
   7 -------------------------------------------------------------------------------
   8 License
   9     This file is part of OpenFOAM.
  10
  11     OpenFOAM is free software; you can redistribute it and/or modify it
  12     under the terms of the GNU General Public License as published by the
  13     Free Software Foundation; either version 2 of the License, or (at your
  14     option) any later version.
  15
  16     OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
  17     ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  18     FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  19     for more details.
  20
  21     You should have received a copy of the GNU General Public License
  22     along with OpenFOAM; if not, write to the Free Software Foundation,
  23     Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  24
  25 \*---------------------------------------------------------------------------*/
  26
  27 #include "commonRailInjector.H"
  28 #include "addToRunTimeSelectionTable.H"
  29 #include "Random.H"
  30 #include "mathematicalConstants.H"
  31
  32 // * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
  33 namespace Foam
  34 {
  35
  36 defineTypeNameAndDebug(commonRailInjector, 0);
  37
  38 addToRunTimeSelectionTable
  39 (
  40     injectorType,
  41     commonRailInjector,
  42     dictionary
  43 );
  44 }
  45 // * * * * * * * * * * * * * Private Member Functions  * * * * * * * * * * * //
  46
  47 // * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
  48
  49 // Construct from components
  50 Foam::commonRailInjector::commonRailInjector
  51 (
  52     const Foam::Time& t,
  53     const Foam::dictionary& dict
  54 )
  55 :
  56     injectorType(t, dict),
  57     propsDict_(dict.subDict(typeName + "Props")),
  58     position_(propsDict_.lookup("position")),
  59     direction_(propsDict_.lookup("direction")),
  60     d_(readScalar(propsDict_.lookup("diameter"))),
  61     mass_(readScalar(propsDict_.lookup("mass"))),
  62     injectionPressure_(readScalar(propsDict_.lookup("injectionPressure"))),
  63     T_(readScalar(propsDict_.lookup("temperature"))),
  64     nParcels_(readLabel(propsDict_.lookup("nParcels"))),
  65     X_(propsDict_.lookup("X")),
  66     massFlowRateProfile_(propsDict_.lookup("massFlowRateProfile")),
  67     velocityProfile_(massFlowRateProfile_),
  68     injectionPressureProfile_(propsDict_.lookup("injectionPressureProfile")),
  69     CdProfile_(massFlowRateProfile_),
  70     TProfile_(massFlowRateProfile_),
  71     averageParcelMass_(mass_/nParcels_),
  72     pressureIndependentVelocity_(false)
  73 {
  74
  75     // convert CA to real time
  76     forAll(massFlowRateProfile_, i)
  77     {
  78         massFlowRateProfile_[i][0] = t.userTimeToTime(massFlowRateProfile_[i][0]);
  79         velocityProfile_[i][0] = t.userTimeToTime(massFlowRateProfile_[i][0]);
  80     }
  81
  82     forAll(injectionPressureProfile_, i)
  83     {
  84         injectionPressureProfile_[i][0] = t.userTimeToTime(injectionPressureProfile_[i][0]);
  85     }
  86
  87     if (mag(injectionPressureProfile_[0][0]-massFlowRateProfile_[0][0]) > SMALL)
  88     {
  89         FatalError << "commonRailInjector::commonRailInjector(const time& t, const dictionary dict) " << endl
  90                 << " start-time entries for injectionPressureProfile and massFlowRateProfile do no match"
  91                 << abort(FatalError);
  92     }
  93     Info << "injectionPressureProfile_.size() = " << injectionPressureProfile_.size()
  94         << ", massFlowRateProfile_.size() = " << massFlowRateProfile_.size()
  95         << endl;
  96
  97     if (mag(injectionPressureProfile_[injectionPressureProfile_.size()-1][0]-massFlowRateProfile_[massFlowRateProfile_.size()-1][0]) > SMALL)
  98     {
  99         FatalError << "commonRailInjector::commonRailInjector(const time& t, const dictionary dict) " << endl
 100                 << " end-time entries for injectionPressureProfile and massFlowRateProfile do no match"
 101                 << abort(FatalError);
 102     }
 103
 104     scalar integratedMFR = integrateTable(massFlowRateProfile_);
 105     scalar integratedP = integrateTable(injectionPressureProfile_)/(teoi()-tsoi());
 106
 107     forAll(massFlowRateProfile_, i)
 108     {
 109         // correct the massFlowRateProfile to match the injected mass
 110         massFlowRateProfile_[i][1] *= mass_/integratedMFR;
 111
 112         TProfile_[i][0] = massFlowRateProfile_[i][0];
 113         TProfile_[i][1] = T_;
 114
 115         CdProfile_[i][0] = massFlowRateProfile_[i][0];
 116
 117     }
 118
 119     forAll(injectionPressureProfile_, i)
 120     {
 121         injectionPressureProfile_[i][1] *= injectionPressure_/integratedP;
 122     }
 123     // Normalize the direction vector
 124     direction_ /= mag(direction_);
 125
 126     setTangentialVectors();
 127
 128     // check molar fractions
 129     scalar Xsum = 0.0;
 130     forAll(X_, i)
 131     {
 132         Xsum += X_[i];
 133     }
 134
 135     if (mag(Xsum - 1.0) > SMALL)
 136     {
 137         Info << "Warning!!!\n commonRailInjector::commonRailInjector(const time& t, Istream& is)"
 138             << "X does not add up to 1.0, correcting molar fractions."
 139             << endl;
 140         forAll(X_, i)
 141         {
 142             X_[i] /= Xsum;
 143         }
 144     }
 145     Info << "end constructor. in commonRail" << endl;
 146
 147 }
 148
 149 // * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //
 150
 151 Foam::commonRailInjector::~commonRailInjector()
 152 {}
 153
 154
 155 // * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 156
 157 void Foam::commonRailInjector::setTangentialVectors()
 158 {
 159     Random rndGen(label(0));
 160     scalar magV = 0.0;
 161     vector tangent;
 162
 163     while (magV < SMALL)
 164     {
 165         vector testThis = rndGen.vector01();
 166
 167         tangent = testThis - (testThis & direction_)*direction_;
 168         magV = mag(tangent);
 169     }
 170
 171     tangentialInjectionVector1_ = tangent/magV;
 172     tangentialInjectionVector2_ = direction_ ^ tangentialInjectionVector1_;
 173
 174 }
 175
 176
 177 Foam::label Foam::commonRailInjector::nParcelsToInject
 178 (
 179     const scalar time0,
 180     const scalar time1
 181 ) const
 182 {
 183
 184     scalar mInj = mass_*(fractionOfInjection(time1)-fractionOfInjection(time0));
 185     label nParcels = label(mInj/averageParcelMass_ + 0.49);
 186
 187     return nParcels;
 188 }
 189
 190 const Foam::vector Foam::commonRailInjector::position(const label n) const
 191 {
 192     return position_;
 193 }
 194
 195 Foam::vector Foam::commonRailInjector::position
 196 (
 197     const label n,
 198     const scalar time,
 199     const bool twoD,
 200     const scalar angleOfWedge,
 201     const vector& axisOfSymmetry,
 202     const vector& axisOfWedge,
 203     const vector& axisOfWedgeNormal,
 204     Random& rndGen
 205 ) const
 206 {
 207     if (twoD)
 208     {
 209         scalar is = position_ & axisOfSymmetry;
 210         scalar magInj = mag(position_ - is*axisOfSymmetry);
 211
 212         vector halfWedge =
 213             axisOfWedge*cos(0.5*angleOfWedge)
 214           + axisOfWedgeNormal*sin(0.5*angleOfWedge);
 215         halfWedge /= mag(halfWedge);
 216
 217         return (is*axisOfSymmetry + magInj*halfWedge);
 218     }
 219     else
 220     {
 221         // otherwise, disc injection
 222         scalar iRadius = d_*rndGen.scalar01();
 223         scalar iAngle = 2.0*mathematicalConstant::pi*rndGen.scalar01();
 224
 225         return
 226         (
 227             position_
 228           + iRadius
 229           * (
 230               tangentialInjectionVector1_*cos(iAngle)
 231             + tangentialInjectionVector2_*sin(iAngle)
 232           )
 233         );
 234
 235     }
 236
 237     return position_;
 238 }
 239
 240 Foam::label Foam::commonRailInjector::nHoles() const
 241 {
 242     return 1;
 243 }
 244
 245 Foam::scalar Foam::commonRailInjector::d() const
 246 {
 247     return d_;
 248 }
 249
 250 const Foam::vector& Foam::commonRailInjector::direction
 251 (
 252     const label i,
 253     const scalar time
 254 ) const
 255 {
 256     return direction_;
 257 }
 258
 259 Foam::scalar Foam::commonRailInjector::mass
 260 (
 261     const scalar time0,
 262     const scalar time1,
 263     const bool twoD,
 264     const scalar angleOfWedge
 265 ) const
 266 {
 267     scalar mInj = mass_*(fractionOfInjection(time1)-fractionOfInjection(time0));
 268
 269     // correct mass if calculation is 2D
 270     if (twoD)
 271     {
 272         mInj *= 0.5*angleOfWedge/mathematicalConstant::pi;
 273     }
 274
 275     return mInj;
 276 }
 277
 278 Foam::scalar Foam::commonRailInjector::mass() const
 279 {
 280     return mass_;
 281 }
 282
 283 const Foam::scalarField& Foam::commonRailInjector::X() const
 284 {
 285     return X_;
 286 }
 287
 288 Foam::List<Foam::commonRailInjector::pair> Foam::commonRailInjector::T() const
 289 {
 290     return TProfile_;
 291 }
 292
 293 Foam::scalar Foam::commonRailInjector::T(const scalar time) const
 294 {
 295     return T_;
 296 }
 297
 298 Foam::scalar Foam::commonRailInjector::tsoi() const
 299 {
 300     return massFlowRateProfile_[0][0];
 301 }
 302
 303 Foam::scalar Foam::commonRailInjector::teoi() const
 304 {
 305     return massFlowRateProfile_[massFlowRateProfile_.size()-1][0];
 306 }
 307
 308 Foam::scalar Foam::commonRailInjector::massFlowRate
 309 (
 310     const scalar time
 311 ) const
 312 {
 313     return getTableValue(massFlowRateProfile_, time);
 314 }
 315
 316 Foam::scalar Foam::commonRailInjector::injectionPressure
 317 (
 318     const scalar time
 319 ) const
 320 {
 321     return getTableValue(injectionPressureProfile_, time);
 322 }
 323
 324 Foam::scalar Foam::commonRailInjector::velocity
 325 (
 326     const scalar time
 327 ) const
 328 {
 329     return getTableValue(velocityProfile_, time);
 330 }
 331
 332 Foam::List<Foam::commonRailInjector::pair> Foam::commonRailInjector::CdProfile() const
 333 {
 334     return CdProfile_;
 335 }
 336
 337 Foam::scalar Foam::commonRailInjector::Cd
 338 (
 339     const scalar time
 340 ) const
 341 {
 342     return getTableValue(CdProfile_, time);
 343 }
 344
 345 Foam::scalar Foam::commonRailInjector::fractionOfInjection(const scalar time) const
 346 {
 347     return integrateTable(massFlowRateProfile_, time)/mass_;
 348 }
 349
 350 Foam::scalar Foam::commonRailInjector::injectedMass
 351 (
 352     const scalar t
 353 ) const
 354 {
 355     return mass_*fractionOfInjection(t);
 356 }
 357
 358
 359 void Foam::commonRailInjector::correctProfiles
 360 (
 361     const liquidMixture& fuel,
 362     const scalar referencePressure
 363 )
 364 {
 365     scalar A = 0.25*mathematicalConstant::pi*pow(d_, 2.0);
 366     scalar pDummy = 1.0e+5;
 367     scalar rho = fuel.rho(pDummy, T_, X_);
 368
 369     forAll(velocityProfile_, i)
 370     {
 371         scalar Pinj = getTableValue(injectionPressureProfile_, velocityProfile_[i][0]);
 372         scalar Vinj = sqrt(2.0*(Pinj - referencePressure)/rho);
 373         scalar mfr = massFlowRateProfile_[i][1]/(rho*A);
 374         scalar Cd = mfr/Vinj;
 375         velocityProfile_[i][1] = Vinj;
 376         CdProfile_[i][1] = Cd;
 377     }
 378 }
 379
 380 Foam::vector Foam::commonRailInjector::tan1(const label n) const
 381 {
 382     return tangentialInjectionVector1_;
 383 }
 384
 385 Foam::vector Foam::commonRailInjector::tan2(const label n) const
 386 {
 387     return tangentialInjectionVector2_;
 388 }
 389
 390 // ************************************************************************* //