DEFINITIONS
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
-#define ID_PISTON "$Id: FGPiston.h,v 1.29 2011/06/16 16:32:10 jentron Exp $";
+#define ID_PISTON "$Id: FGPiston.h,v 1.35 2012/04/07 01:50:54 jentron Exp $";
#define FG_MAX_BOOST_SPEEDS 3
/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
<air-intake-impedance-factor> {number} </air-intake-impedance-factor>
<ram-air-factor> {number} </ram-air-factor>
<cooling-factor> {number} </cooling-factor>
+ <man-press-lag> {number} </man-press-lag>
+ <starter-torque> {number} </starter-torque>
+ <starter-rpm> {number} </starter-rpm>
<cylinder-head-mass unit="{KG | LBS}"> {number} </cylinder-head-mass>
<bsfc unit="{LBS/HP*HR | "KG/KW*HR"}"> {number} </bsfc>
<volumetric-efficiency> {number} </volumetric-efficiency>
<numboostspeeds> {number} </numboostspeeds>
<boostoverride> {0 | 1} </boostoverride>
<boostmanual> {0 | 1} </boostmanual>
+ <boost-loss-factor> {number} </boost-loss-factor>
<ratedboost1 unit="{INHG | PA | ATM}"> {number} </ratedboost1>
<ratedpower1 unit="{HP | WATTS}"> {number} </ratedpower1>
<ratedrpm1> {number} </ratedrpm1>
- \b maxmp - this value is the nominal maximum manifold pressure at sea-level
without boost. Along with maxrpm it determines the resistance of the
aircraft intake system. Overridden by air-intake-impedance-factor
+- \b man-press-lag - Delay in seconds for manifold pressure changes to take effect
+- \b starter-torque - A value specifing the zero RPM torque in lb*ft the starter motor
+ provides. Current default value is 40% of the horse power value.
+- \b starter-rpm - A value specifing the maximum RPM the unloaded starter motor
+ can achieve. Loads placed on the engine by the propeller and throttle will
+ further limit RPM achieved in practice.
- \b idlerpm - this value affects the throttle fall off and the engine stops
running if it is slowed below 80% of this value. The engine starts
running when it reaches 80% of this value.
supercharger speeds. Merlin XII had 1 speed, Merlin 61 had 2, a late
Griffon engine apparently had 3. No known engine more than 3, although
some German engines had continuously variable-speed superchargers.
-- \b boostoverride - unused
+- \b boostoverride - whether or not to clip output to the wastegate value
+- \b boost-loss-factor - zero (or not present) for 'free' supercharging. A value entered
+ will be used as a multiplier to the power required to compress the input air. Typical
+ value should be 1.15 to 1.20.
- \b boostmanual - whether a multispeed supercharger will manually or
automatically shift boost speeds. On manual shifting the boost speeds is
accomplished by controlling the property propulsion/engine/boostspeed.
@author David Megginson (initial porting and additional code)
@author Ron Jensen (additional engine code)
@see Taylor, Charles Fayette, "The Internal Combustion Engine in Theory and Practice"
- @version $Id: FGPiston.h,v 1.29 2011/06/16 16:32:10 jentron Exp $
+ @version $Id: FGPiston.h,v 1.35 2012/04/07 01:50:54 jentron Exp $
*/
/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
{
public:
/// Constructor
- FGPiston(FGFDMExec* exec, Element* el, int engine_number);
+ FGPiston(FGFDMExec* exec, Element* el, int engine_number, struct Inputs& input);
/// Destructor
~FGPiston();
int crank_counter;
double IndicatedHorsePower;
+ double IndicatedPower;
double PMEP;
double FMEP;
double FMEPDynamic;
double FMEPStatic;
-
- // timestep
- double dt;
+ double T_Intake;
void doEngineStartup(void);
void doBoostControl(void);
void doCHT(void);
void doOilPressure(void);
void doOilTemperature(void);
+ double GetStdPressure100K(double altitude) const;
int InitRunning(void);
double MinManifoldPressure_inHg; // Inches Hg
double MaxManifoldPressure_inHg; // Inches Hg
double MaxManifoldPressure_Percent; // MaxManifoldPressure / 29.92
+ double ManifoldPressureLag; // Manifold Pressure delay in seconds.
double Displacement; // cubic inches
double displacement_SI; // cubic meters
double MaxHP; // horsepower
double RatedMeanPistonSpeed_fps; // ft/sec derived from MaxRPM and stroke.
double Ram_Air_Factor; // number
- double StarterHP; // initial horsepower of starter motor
+ double StarterTorque;// Peak Torque of the starter motor
+ double StarterRPM; // Peak RPM of the starter motor
+ double StarterGain; // control the torque of the starter motor.
int BoostSpeeds; // Number of super/turbocharger boost speeds - zero implies no turbo/supercharging.
int BoostSpeed; // The current boost-speed (zero-based).
bool Boosted; // Set true for boosted engine.
double RatedMAP[FG_MAX_BOOST_SPEEDS]; // Rated manifold absolute pressure [Pa] (BCV clamp)
double TakeoffMAP[FG_MAX_BOOST_SPEEDS]; // Takeoff setting manifold absolute pressure [Pa] (BCV clamp)
double BoostSwitchHysteresis; // Pa.
+ double BoostLossFactor; // multiplier for HP consumed by the supercharger
double minMAP; // Pa
double maxMAP; // Pa
//
// Inputs (in addition to those in FGEngine).
//
+ double TotalDeltaT; // Time in seconds between calls.
double p_amb; // Pascals
double p_ram; // Pascals
double T_amb; // degrees Kelvin
//
double rho_air;
double volumetric_efficiency;
+ double volumetric_efficiency_reduced;
double map_coefficient;
double m_dot_air;
+ double v_dot_air;
double equivalence_ratio;
double m_dot_fuel;
double HP;
+ double BoostLossHP;
double combustion_efficiency;
double ExhaustGasTemp_degK;
double EGT_degC;
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