Volume 41 Issue 5
May  2026
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WANG Yining, JI Jiayuan, ZHANG Xintao, et al. CFD-based research on exhaust characteristics of ejector for a propfan engine nacelle ventilating[J]. Journal of Aerospace Power, 2026, 41(5):20240555 doi: 10.13224/j.cnki.jasp.20240555
Citation: WANG Yining, JI Jiayuan, ZHANG Xintao, et al. CFD-based research on exhaust characteristics of ejector for a propfan engine nacelle ventilating[J]. Journal of Aerospace Power, 2026, 41(5):20240555 doi: 10.13224/j.cnki.jasp.20240555

CFD-based research on exhaust characteristics of ejector for a propfan engine nacelle ventilating

doi: 10.13224/j.cnki.jasp.20240555
  • Received Date: 2024-08-07
    Available Online: 2026-02-13
  • In order to analyze the influence of ejection ventilation structure on exhaust flow performance under low altitude and low speed conditions of a propfan engine configuration, a simulation model incorporating core compartment/internal nozzle/ejection outlet was constructed. The influences of various ejection structure schemes on exhaust characteristics were researched by numerical simulation method, and the causes for the change were analyzed from the perspective of flow mechanism. The results showed that the secondary flow coefficient decreased with the increase of the length ratio of the ejector outlet under low-altitude and low-speed conditions, and the trend was gentle later, simultaneously the peak appeared near a certain value with the decrease of the opening ratio D2/D1. The state of the mixing point (the uniform point of the boundary velocity of the primary and secondary flows) can indicate the uniform mixing of the boundary layer of primary and secondary flows. The pumping capacity of the mainstream to the secondary flow increased with the decrease of the length ratio of the ejector outlet, and reached the maximum when the length ratio L1/D1 was near 0.66. With the increase of Mach number from 0.01 to 0.2, the trend of the conversion flow ratio at each Mach number was similar, and the flow coefficient of each profile was higher than that of the low-flow Mach number scheme, which proved the severity of the ventilation of the engine under the low-altitude and low-speed conditions under the flight envelope. Finally, an empirical correlation fitting model between flow coefficient and length ratio and opening ratio was proposed.

     

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