| Citation: | YUAN Changkun, LIU Jiao, LIU Huoxing, et al. Second power system modeling and performance analysis[J]. Journal of Aerospace Power, 2024, 39（10）：20220197 doi: 10.13224/j.cnki.jasp.20220197
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In order to analyze the overall working characteristics of the second power system of aircraft, a component-level modeling method and multi-population genetic algorithm were used to model the second power system, which consisted of the auxiliary power unit (APU), exhaust pipe and air turbine starter (ATS). The reliability of the simulation model was verified by comparison with the reference data, and the error of the simulation results was less than 3.5%. The loss characteristics of the bleed air pipeline and the working characteristics of APU and ATS were obtained by simulation calculation. The temperature characteristics, altitude velocity characteristics and load characteristics of the system were obtained by simulation analysis for the whole system. The results showed that the efficiency of the bleed air pipeline changed significantly with the bleed air parameters, and there existed a coupling relationship between the components of the second power system. The overall performance parameters such as the equivalent power of the system decreased with the increase of altitude, and the efficiency of the system decreased with the increase of flight speed. The research conclusion can provide a reference for the design of advanced second power system.
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