| Citation: | JIANG Tianmu, ZHANG Xiaobo, WANG Zhanxue, et al. Analysis of lift fan system parameter matching and operating characteristics[J]. Journal of Aerospace Power, 2025, 40（12）：20230789 doi: 10.13224/j.cnki.jasp.20230789
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Through force analysis and thermodynamic process analysis, a component-level performance calculation model for the lift fan system was established. The impact of design parameters on performance was analyzed, and based on this, a preliminary design method for the lift fan system was proposed. By deriving the common working equations and calculating the common operating lines through numerical methods, the characteristics of the lift fan operating lines and the influences of various parameters on these lines were examined. The altitude-speed characteristics and lift adjustment characteristics of the lift fan system were calculated, and a multi-parameter joint control law for lift adjustment was proposed. The results showed that the performance calculation model’s results were consistent with the trends of CFD simulation results; increasing the design flow rate and pressure ratio can enhance the lift, but a high pressure ratio design may lead to lower lift efficiency. As the rotational speed decreased, the working line gradually dispersed from a power function of converted flow rate and pressure ratio into a cluster of curves related to Mach number, with the steady-state and dynamic operating lines being essentially consistent. The multi-parameter joint control law can adjust the lift of the lift fan system while maintaining constant rotational speed and margin.
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