143 lines
4.8 KiB
C++
143 lines
4.8 KiB
C++
/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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Header: FGRocket.h
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Author: Jon S. Berndt
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Date started: 09/12/2000
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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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HISTORY
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--------------------------------------------------------------------------------
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09/12/2000 JSB Created
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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SENTRY
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
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#ifndef FGROCKET_H
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#define FGROCKET_H
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/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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INCLUDES
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
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#include "FGEngine.h"
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#include "FGConfigFile.h"
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/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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DEFINITIONS
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
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#define ID_ROCKET "$Id$"
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/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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FORWARD DECLARATIONS
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
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namespace JSBSim {
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/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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CLASS DOCUMENTATION
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
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/** Models a generic rocket engine.
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The rocket engine is modeled given the following parameters:
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<ul>
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<li>Chamber pressure (in psf)</li>
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<li>Specific heat ratio (usually about 1.2 for hydrocarbon fuel and LOX)</li>
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<li>Propulsive efficiency (in percent, from 0 to 1.0)</li>
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<li>Variance (in percent, from 0 to 1.0, nominally 0.05)</li>
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</ul>
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Additionally, the following control inputs, operating characteristics, and
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location are required, as with all other engine types:
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<ul>
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<li>Throttle setting (in percent, from 0 to 1.0)</li>
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<li>Maximum allowable throttle setting</li>
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<li>Minimum working throttle setting</li>
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<li>Sea level fuel flow at maximum thrust</li>
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<li>Sea level oxidizer flow at maximum thrust</li>
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<li>X, Y, Z location in structural coordinate frame</li>
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<li>Pitch and Yaw</li>
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</ul>
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The nozzle exit pressure (p2) is returned via a
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call to FGNozzle::GetPowerRequired(). This exit pressure is used,
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along with chamber pressure and specific heat ratio, to get the
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thrust coefficient for the throttle setting. This thrust
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coefficient is multiplied by the chamber pressure and then passed
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to the nozzle Calculate() routine, where the thrust force is
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determined.
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@author Jon S. Berndt
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$Id$
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@see FGNozzle,
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FGThruster,
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FGForce,
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FGEngine,
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FGPropulsion,
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FGTank
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*/
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/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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CLASS DECLARATION
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
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class FGRocket : public FGEngine
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{
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public:
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/** Constructor.
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@param exec pointer to JSBSim parent object, the FDM Executive.
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@param Eng_cfg pointer to the config file object.
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@param engine_number engine number */
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FGRocket(FGFDMExec* exec, FGConfigFile* Eng_cfg, int engine_number);
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/** Destructor */
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~FGRocket(void);
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/** Determines the thrust coefficient.
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@return thrust coefficient times chamber pressure */
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double Calculate(void);
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/** Gets the chamber pressure.
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@return chamber pressure in psf. */
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double GetChamberPressure(void) {return PC;}
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/** Gets the flame-out status.
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The engine will "flame out" if the throttle is set below the minimum
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sustainable setting.
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@return true if engine has flamed out. */
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bool GetFlameout(void) {return Flameout;}
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string GetEngineLabels(void);
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string GetEngineValues(void);
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private:
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double SHR;
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double maxPC;
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double propEff;
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double kFactor;
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double Variance;
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double PC;
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bool Flameout;
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void Debug(int from);
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};
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}
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//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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#endif
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