INCLUDES
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
+#include <sstream>
+
#include "FGNozzle.h"
+#include "FGAtmosphere.h"
+
+namespace JSBSim {
-static const char *IdSrc = "$Header$";
+static const char *IdSrc = "$Id$";
static const char *IdHdr = ID_NOZZLE;
/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
-FGNozzle::FGNozzle(FGFDMExec *FDMExec) : FGThruster(FDMExec)
+FGNozzle::FGNozzle(FGFDMExec* FDMExec, FGConfigFile* Nzl_cfg, int num) : FGThruster(FDMExec)
+{
+ string token;
+
+ Name = Nzl_cfg->GetValue("NAME");
+ Nzl_cfg->GetNextConfigLine();
+ while (Nzl_cfg->GetValue() != string("/FG_NOZZLE")) {
+ *Nzl_cfg >> token;
+ if (token == "PE") *Nzl_cfg >> PE;
+ else if (token == "EXPR") *Nzl_cfg >> ExpR;
+ else if (token == "NZL_EFF") *Nzl_cfg >> nzlEff;
+ else if (token == "DIAM") *Nzl_cfg >> Diameter;
+ else cerr << "Unhandled token in Nozzle config file: " << token << endl;
+ }
+
+ Thrust = 0;
+ Type = ttNozzle;
+ Area2 = (Diameter*Diameter/4.0)*M_PI;
+ AreaT = Area2/ExpR;
+
+ char property_name[80];
+ snprintf(property_name, 80, "propulsion/c-thrust[%u]", EngineNum);
+ PropertyManager->Tie( property_name, &ThrustCoeff );
+
+ Debug(0);
+}
+
+//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+FGNozzle::~FGNozzle()
+{
+ char property_name[80];
+ snprintf(property_name, 80, "propulsion/c-thrust[%u]", EngineNum);
+ PropertyManager->Untie( property_name );
+
+ Debug(1);
+}
+
+//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+double FGNozzle::Calculate(double CfPc)
{
+ double pAtm = fdmex->GetAtmosphere()->GetPressure();
+ Thrust = max((double)0.0, (CfPc * AreaT + (PE - pAtm)*Area2) * nzlEff);
+ vFn(1) = Thrust;
+ ThrustCoeff = max((double)0.0, CfPc / ((pAtm - PE) * Area2));
+
+ return Thrust;
}
+//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-void FGNozzle::Calculate(void)
+double FGNozzle::GetPowerRequired(void)
{
- FGThruster::Calculate();
+ return PE;
+}
+
+//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+string FGNozzle::GetThrusterLabels(int id, string delimeter)
+{
+ std::ostringstream buf;
+
+ buf << Name << "_Thrust[" << id << ']';
+
+ return buf.str();
+}
+
+//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+string FGNozzle::GetThrusterValues(int id, string delimeter)
+{
+ std::ostringstream buf;
+
+ buf << Thrust;
+
+ return buf.str();
+}
+
+//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+// The bitmasked value choices are as follows:
+// unset: In this case (the default) JSBSim would only print
+// out the normally expected messages, essentially echoing
+// the config files as they are read. If the environment
+// variable is not set, debug_lvl is set to 1 internally
+// 0: This requests JSBSim not to output any messages
+// whatsoever.
+// 1: This value explicity requests the normal JSBSim
+// startup messages
+// 2: This value asks for a message to be printed out when
+// a class is instantiated
+// 4: When this value is set, a message is displayed when a
+// FGModel object executes its Run() method
+// 8: When this value is set, various runtime state variables
+// are printed out periodically
+// 16: When set various parameters are sanity checked and
+// a message is printed out when they go out of bounds
+
+void FGNozzle::Debug(int from)
+{
+ if (debug_lvl <= 0) return;
+
+ if (debug_lvl & 1) { // Standard console startup message output
+ if (from == 0) { // Constructor
+ cout << " Nozzle Name: " << Name << endl;
+ cout << " Nozzle Exit Pressure = " << PE << endl;
+ cout << " Nozzle Expansion Ratio = " << ExpR << endl;
+ cout << " Nozzle Efficiency = " << nzlEff << endl;
+ cout << " Nozzle Diameter = " << Diameter << endl;
+ }
+ }
+ if (debug_lvl & 2 ) { // Instantiation/Destruction notification
+ if (from == 0) cout << "Instantiated: FGNozzle" << endl;
+ if (from == 1) cout << "Destroyed: FGNozzle" << endl;
+ }
+ if (debug_lvl & 4 ) { // Run() method entry print for FGModel-derived objects
+ }
+ if (debug_lvl & 8 ) { // Runtime state variables
+ }
+ if (debug_lvl & 16) { // Sanity checking
+ }
+ if (debug_lvl & 64) {
+ if (from == 0) { // Constructor
+ cout << IdSrc << endl;
+ cout << IdHdr << endl;
+ }
+ }
+}
}