aircraft:tmd:turbo_engines
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aircraft:tmd:turbo_engines [2021/02/12 13:00] – [Step 6 - Engine control (FADEC)] jh | aircraft:tmd:turbo_engines [2021/02/12 13:51] – [Step 6 - Engine control (FADEC)] jh | ||
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Turbo-engines in real life are often controlled by full authority digital engine controllers (FADECs). These take sensor readings from the engine, air data computers, thrust lever angle and other inputs to compute the required engine fuel flow. | Turbo-engines in real life are often controlled by full authority digital engine controllers (FADECs). These take sensor readings from the engine, air data computers, thrust lever angle and other inputs to compute the required engine fuel flow. | ||
- | For a very basic fuel controller you can implement a fuel flow proportional to the compressor output pressure. | + | For a very basic fuel controller you can implement a fuel flow proportional to the compressor output pressure |
- | Do something like this in the tmd: | + | < |
- | < | + | Enrichment |
- | Enrichment | + | Gain = PitotTube.StaticPressure |
- | FuelFlowRaw = product( FuelFlowConstant | + | FuelFlowRaw = Gain * C_FF * ( Governor + Enrichment ) |
FuelFlow = clamp( FuelFlowRaw, | FuelFlow = clamp( FuelFlowRaw, | ||
+ | |||
+ | where C_Gov is your governor gain (about 0.2 is ok), and C_FF is your fuel flow constant, use your maximum takeoff fuel flow at the beginning. MinFuelFlow is your idle fuel flow at high altitude (high enough to prevent flame out) and MaxFuelFlow is your takeoff fuel flow plus a small amount. DesignCompressionRatio is the compression ratio that you see at takeoff power (depending on the engine data, ranges between like 11 to 42). | ||
aircraft/tmd/turbo_engines.txt · Last modified: 2022/08/02 10:00 by jh