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Before running the jet engine, we needed to get the idle point as well as other off-design running state. To analyze the off-design point, we were required to first acquire performance map of each component.
Before running the jet engine, we needed to get the idle point as well as other off-design running state. To analyze the off-design point, we were required to first acquire performance map of each component.
Performance map
Performance map
Compressor performance map was generated by compressor CFD, in which the CFD setup had been validated from the compressor rig experiment.
Combustor performance map was separated into two sub-maps: pressure loss map, which was approximated by the cool flow combustor experiment, and burning map, which was generated by combustor burning experiment.
Turbine performance map was generated by turbine-rotor CFD, where we could not validate the CFD results because of the cost and complexity of setting up a turbine rig test.
Nozzle performance was directly modeled in the off-design program because of the simple design of our exhaust nozzle.
Off design analysis
Off design analysis
This specialized program found the running point at off-design RPM.
This specialized program found the running point at off-design RPM.
The program helped us to get the steady state working point at idle point, which was the very critical information while starting the jet engine. At specific RPM, the program would generate four plots: Match mass flow & Match work plot, power vs mass flow plot, BPR plot, and Compressor & Turbine plot. These four plots gave the information about whether the jet engine can run at current state or not. After running Off Design.m, we ran the program BurningMap_after.m to observe the working point on the burning map. Therefore, we could examine the burning state to check if it fell into the safe burning region.
Operation line
Operation line
After running off-design analysis for several RPM, we constructed the steady state working line on compressor, burning, and turbine map. The idle point was estimated at 14,000RPM, T4 = 900K.
After running off-design analysis for several RPM, we constructed the steady state working line on compressor, burning, and turbine map. The idle point was estimated at 14,000RPM, T4 = 900K.
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