117 lines
3.6 KiB
C++
117 lines
3.6 KiB
C++
/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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Module: FGNozzle.cpp
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Author: Jon S. Berndt
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Date started: 08/24/00
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Purpose: Encapsulates the nozzle object
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------------- Copyright (C) 2000 Jon S. Berndt (jsb@hal-pc.org) -------------
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This program is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free Software
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Foundation; either version 2 of the License, or (at your option) any later
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version.
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This program 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 FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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details.
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You should have received a copy of the GNU General Public License along with
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this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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Place - Suite 330, Boston, MA 02111-1307, USA.
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Further information about the GNU General Public License can also be found on
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the world wide web at http://www.gnu.org.
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FUNCTIONAL DESCRIPTION
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--------------------------------------------------------------------------------
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HISTORY
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--------------------------------------------------------------------------------
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08/24/00 JSB Created
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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INCLUDES
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
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#ifdef FGFS
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# include <simgear/compiler.h>
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# include STL_ALGORITHM
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#else
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# include <algorithm>
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#endif
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#include "FGNozzle.h"
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static const char *IdSrc = "$Id$";
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static const char *IdHdr = ID_NOZZLE;
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/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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CLASS IMPLEMENTATION
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
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FGNozzle::FGNozzle(FGFDMExec* FDMExec, FGConfigFile* Nzl_cfg) : FGThruster(FDMExec)
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{
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string token;
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Name = Nzl_cfg->GetValue("NAME");
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Nzl_cfg->GetNextConfigLine();
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while (Nzl_cfg->GetValue() != "/FG_NOZZLE") {
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*Nzl_cfg >> token;
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if (token == "PE") *Nzl_cfg >> PE;
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else if (token == "EXPR") *Nzl_cfg >> ExpR;
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else if (token == "NZL_EFF") *Nzl_cfg >> nzlEff;
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else if (token == "DIAM") *Nzl_cfg >> Diameter;
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else cerr << "Unhandled token in Nozzle config file: " << token << endl;
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}
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if (debug_lvl > 0) {
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cout << " Nozzle Name: " << Name << endl;
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cout << " Nozzle Exit Pressure = " << PE << endl;
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cout << " Nozzle Expansion Ratio = " << ExpR << endl;
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cout << " Nozzle Efficiency = " << nzlEff << endl;
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cout << " Nozzle Diameter = " << Diameter << endl;
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}
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Thrust = 0;
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Type = ttNozzle;
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Area2 = (Diameter*Diameter/4.0)*M_PI;
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AreaT = Area2/ExpR;
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if (debug_lvl & 2) cout << "Instantiated: FGNozzle" << endl;
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}
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//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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FGNozzle::~FGNozzle()
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{
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if (debug_lvl & 2) cout << "Destroyed: FGNozzle" << endl;
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}
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//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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float FGNozzle::Calculate(float CfPc)
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{
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float pAtm = fdmex->GetAtmosphere()->GetPressure();
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Thrust = max((float)0.0, (CfPc * AreaT + (PE - pAtm)*Area2) * nzlEff);
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vFn(1) = Thrust;
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return Thrust;
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}
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//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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float FGNozzle::GetPowerRequired(void)
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{
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return PE;
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}
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//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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void FGNozzle::Debug(void)
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{
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//TODO: Add your source code here
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}
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