Date started: 08/24/00
Purpose: Encapsulates the nozzle object
- ------------- Copyright (C) 2000 Jon S. Berndt (jsb@hal-pc.org) -------------
+ ------------- Copyright (C) 2000 Jon S. Berndt (jon@jsbsim.org) -------------
This program is free software; you can redistribute it and/or modify it under
- the terms of the GNU General Public License as published by the Free Software
+ the terms of the GNU Lesser General Public License as published by the Free Software
Foundation; either version 2 of the License, or (at your option) any later
version.
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
+ FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
details.
- You should have received a copy of the GNU General Public License along with
+ You should have received a copy of the GNU Lesser General Public License along with
this program; if not, write to the Free Software Foundation, Inc., 59 Temple
Place - Suite 330, Boston, MA 02111-1307, USA.
- Further information about the GNU General Public License can also be found on
+ Further information about the GNU Lesser General Public License can also be found on
the world wide web at http://www.gnu.org.
FUNCTIONAL DESCRIPTION
INCLUDES
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
+#include <iostream>
#include <sstream>
+#include <cstdlib>
#include "FGNozzle.h"
-#include <models/FGAtmosphere.h>
+#include "models/FGAtmosphere.h"
+#include "input_output/FGXMLElement.h"
+
+using namespace std;
namespace JSBSim {
-static const char *IdSrc = "$Id$";
+static const char *IdSrc = "$Id: FGNozzle.cpp,v 1.13 2009/10/26 03:49:58 jberndt Exp $";
static const char *IdHdr = ID_NOZZLE;
/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
-FGNozzle::FGNozzle(FGFDMExec* FDMExec, Element* nozzle_element, int num) : FGThruster(FDMExec)
+FGNozzle::FGNozzle(FGFDMExec* FDMExec, Element* nozzle_element, int num)
+ : FGThruster(FDMExec, nozzle_element, num)
{
-
- if (nozzle_element->FindElement("pe"))
- PE = nozzle_element->FindElementValueAsNumberConvertTo("pe", "PSF");
+ if (nozzle_element->FindElement("area"))
+ Area = nozzle_element->FindElementValueAsNumberConvertTo("area", "FT2");
else {
- cerr << "Fatal Error: Nozzle exit pressure must be given in nozzle config file." << endl;
+ cerr << "Fatal Error: Nozzle exit area must be given in nozzle config file." << endl;
exit(-1);
}
- if (nozzle_element->FindElement("expr"))
- ExpR = nozzle_element->FindElementValueAsNumber("expr");
- else {
- cerr << "Fatal Error: Nozzle expansion ratio must be given in nozzle config file." << endl;
- exit(-1);
- }
- if (nozzle_element->FindElement("nzl_eff"))
- nzlEff = nozzle_element->FindElementValueAsNumber("nzl_eff");
- else {
- cerr << "Fatal Error: Nozzle efficiency must be given in nozzle config file." << endl;
- exit(-1);
- }
- if (nozzle_element->FindElement("diam"))
- Diameter = nozzle_element->FindElementValueAsNumberConvertTo("diam", "FT");
+/*
+ if (nozzle_element->FindElement("pe"))
+ PE = nozzle_element->FindElementValueAsNumberConvertTo("pe", "PSF");
else {
- cerr << "Fatal Error: Nozzle diameter must be given in nozzle config file." << endl;
+ cerr << "Fatal Error: Nozzle exit pressure must be given in nozzle config file." << endl;
exit(-1);
}
-
+*/
Thrust = 0;
- ReverserAngle = 0.0;
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 FGNozzle::Calculate(double vacThrust)
{
double pAtm = fdmex->GetAtmosphere()->GetPressure();
- Thrust = max((double)0.0, (CfPc * AreaT + (PE - pAtm)*Area2) * nzlEff);
- vFn(1) = Thrust * cos(ReverserAngle);
+ Thrust = max((double)0.0, vacThrust - pAtm*Area);
- ThrustCoeff = max((double)0.0, CfPc / ((pAtm - PE) * Area2));
+ vFn(1) = Thrust * cos(ReverserAngle);
return Thrust;
}
//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-double FGNozzle::GetPowerRequired(void)
-{
- return PE;
-}
-
-//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-
string FGNozzle::GetThrusterLabels(int id, string delimeter)
{
std::ostringstream buf;
- buf << Name << "_Thrust[" << id << ']';
+ buf << Name << " Thrust (engine " << id << " in lbs)";
return buf.str();
}
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;
+ cout << " Nozzle Exit Area = " << Area << endl;
}
}
if (debug_lvl & 2 ) { // Instantiation/Destruction notification
projects / flightgear.git / blobdiff