flightgear-mirage2000
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5H1N0B11
Engine tuning
Engine have to be computed (maybe to have a constant thrust with a given throttle position =>I need to re read the pilot handbook about that)
I think that if the engine is computed for a specific thrust. The air pressure (altitude) should be taken into consideration. (I don't expect the engine at half the throttle to have the same thrust asl than at FL500 (50, 000f)).
Maybe it should be mapped in combination of the throttle position with the static pressure and the cd factor to be able to expect the same speed under any given throttle pos, flight level and loadout configuration.
This refers to the "Engine Control Logic" in the diagram below. I haven't been able to find any information (or clues) as to how the logic operates.
So all that we do know is that the following are inputs
- Total Pressure
- Alpha (angle of attack)
- Inlet temperature
- Engine Mode
- HPCpressure
- HPC temperature
Which does include the items you mention; we just have to figure out what it does.
If we can't find specific information then probably we'll just have to adopt controls from a similar engine - for example the P&W F100 (JTF22) has extensive documentation on "multivariate control"
References:
- https://apps.dtic.mil/docs/citations/ADA052420
- https://apps.dtic.mil/docs/citations/ADA052346
- https://www.sciencedirect.com/science/article/pii/B9780080220109500578
- https://ntrs.nasa.gov/search.jsp?R=19790016844
- https://core.ac.uk/reader/301546517