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
46 #include "FGAtmosphere.h"
50 static const char *IdSrc = "$Id$";
51 static const char *IdHdr = ID_NOZZLE;
53 /*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
55 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
58 FGNozzle::FGNozzle(FGFDMExec* FDMExec, FGConfigFile* Nzl_cfg) : FGThruster(FDMExec)
62 Name = Nzl_cfg->GetValue("NAME");
63 Nzl_cfg->GetNextConfigLine();
64 while (Nzl_cfg->GetValue() != string("/FG_NOZZLE")) {
66 if (token == "PE") *Nzl_cfg >> PE;
67 else if (token == "EXPR") *Nzl_cfg >> ExpR;
68 else if (token == "NZL_EFF") *Nzl_cfg >> nzlEff;
69 else if (token == "DIAM") *Nzl_cfg >> Diameter;
70 else cerr << "Unhandled token in Nozzle config file: " << token << endl;
76 Area2 = (Diameter*Diameter/4.0)*M_PI;
82 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
89 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
91 double FGNozzle::Calculate(double CfPc)
93 double pAtm = fdmex->GetAtmosphere()->GetPressure();
94 Thrust = max((double)0.0, (CfPc * AreaT + (PE - pAtm)*Area2) * nzlEff);
95 vFn(1) = Thrust * cos(ReverserAngle);
100 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
102 double FGNozzle::GetPowerRequired(void)
107 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
108 // The bitmasked value choices are as follows:
109 // unset: In this case (the default) JSBSim would only print
110 // out the normally expected messages, essentially echoing
111 // the config files as they are read. If the environment
112 // variable is not set, debug_lvl is set to 1 internally
113 // 0: This requests JSBSim not to output any messages
115 // 1: This value explicity requests the normal JSBSim
117 // 2: This value asks for a message to be printed out when
118 // a class is instantiated
119 // 4: When this value is set, a message is displayed when a
120 // FGModel object executes its Run() method
121 // 8: When this value is set, various runtime state variables
122 // are printed out periodically
123 // 16: When set various parameters are sanity checked and
124 // a message is printed out when they go out of bounds
126 void FGNozzle::Debug(int from)
128 if (debug_lvl <= 0) return;
130 if (debug_lvl & 1) { // Standard console startup message output
131 if (from == 0) { // Constructor
132 cout << " Nozzle Name: " << Name << endl;
133 cout << " Nozzle Exit Pressure = " << PE << endl;
134 cout << " Nozzle Expansion Ratio = " << ExpR << endl;
135 cout << " Nozzle Efficiency = " << nzlEff << endl;
136 cout << " Nozzle Diameter = " << Diameter << endl;
139 if (debug_lvl & 2 ) { // Instantiation/Destruction notification
140 if (from == 0) cout << "Instantiated: FGNozzle" << endl;
141 if (from == 1) cout << "Destroyed: FGNozzle" << endl;
143 if (debug_lvl & 4 ) { // Run() method entry print for FGModel-derived objects
145 if (debug_lvl & 8 ) { // Runtime state variables
147 if (debug_lvl & 16) { // Sanity checking
149 if (debug_lvl & 64) {
150 if (from == 0) { // Constructor
151 cout << IdSrc << endl;
152 cout << IdHdr << endl;