1 /*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
6 Purpose: Encapsulates the nozzle object
8 ------------- Copyright (C) 2000 Jon S. Berndt (jsb@hal-pc.org) -------------
10 This program is free software; you can redistribute it and/or modify it under
11 the terms of the GNU General Public License as published by the Free Software
12 Foundation; either version 2 of the License, or (at your option) any later
15 This program is distributed in the hope that it will be useful, but WITHOUT
16 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
17 FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
20 You should have received a copy of the GNU General Public License along with
21 this program; if not, write to the Free Software Foundation, Inc., 59 Temple
22 Place - Suite 330, Boston, MA 02111-1307, USA.
24 Further information about the GNU General Public License can also be found on
25 the world wide web at http://www.gnu.org.
27 FUNCTIONAL DESCRIPTION
28 --------------------------------------------------------------------------------
31 --------------------------------------------------------------------------------
34 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
36 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
39 # include <simgear/compiler.h>
40 # include STL_ALGORITHM
47 static const char *IdSrc = "$Id$";
48 static const char *IdHdr = ID_NOZZLE;
50 /*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
52 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
55 FGNozzle::FGNozzle(FGFDMExec* FDMExec, FGConfigFile* Nzl_cfg) : FGThruster(FDMExec)
59 Name = Nzl_cfg->GetValue("NAME");
60 Nzl_cfg->GetNextConfigLine();
61 while (Nzl_cfg->GetValue() != "/FG_NOZZLE") {
63 if (token == "PE") *Nzl_cfg >> PE;
64 else if (token == "EXPR") *Nzl_cfg >> ExpR;
65 else if (token == "NZL_EFF") *Nzl_cfg >> nzlEff;
66 else if (token == "DIAM") *Nzl_cfg >> Diameter;
67 else cerr << "Unhandled token in Nozzle config file: " << token << endl;
71 cout << " Nozzle Name: " << Name << endl;
72 cout << " Nozzle Exit Pressure = " << PE << endl;
73 cout << " Nozzle Expansion Ratio = " << ExpR << endl;
74 cout << " Nozzle Efficiency = " << nzlEff << endl;
75 cout << " Nozzle Diameter = " << Diameter << endl;
80 Area2 = (Diameter*Diameter/4.0)*M_PI;
83 if (debug_lvl & 2) cout << "Instantiated: FGNozzle" << endl;
86 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
90 if (debug_lvl & 2) cout << "Destroyed: FGNozzle" << endl;
93 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
95 float FGNozzle::Calculate(float CfPc)
97 float pAtm = fdmex->GetAtmosphere()->GetPressure();
98 Thrust = max((float)0.0, (CfPc * AreaT + (PE - pAtm)*Area2) * nzlEff);
104 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
106 float FGNozzle::GetPowerRequired(void)
111 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
113 void FGNozzle::Debug(void)
115 //TODO: Add your source code here