Volume 38 Issue 12
Dec.  2023
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LI Zijie, WANG Hao, HUANG Hexia. Analysis of flow field of three-dimensional ejector nozzle with open-close alternate intake valve at transonic velocity[J]. Journal of Aerospace Power, 2023, 38(12):2937-2947 doi: 10.13224/j.cnki.jasp.20210581
Citation: LI Zijie, WANG Hao, HUANG Hexia. Analysis of flow field of three-dimensional ejector nozzle with open-close alternate intake valve at transonic velocity[J]. Journal of Aerospace Power, 2023, 38(12):2937-2947 doi: 10.13224/j.cnki.jasp.20210581

Analysis of flow field of three-dimensional ejector nozzle with open-close alternate intake valve at transonic velocity

doi: 10.13224/j.cnki.jasp.20210581
  • Received Date: 2021-10-13
    Available Online: 2023-10-08
  • To analyze the influence of different secondary air intake states, the flow characteristics of an ejector nozzle with open-close intake valves in the transonic flight state (Ma=1.2) were simulated and studied. By changing the nozzle pressure ratio (NPR) of the secondary flow, the flow state of the third flow, the development characteristics of the vortex, and the thrust performance in the nozzle were analyzed. The results showed that the airflow in the ejector nozzle with the open-close alternate intake valve had the phenomenon of lateral flow, forming a vortex ring that the size of the flow vortex gradually decreased along the flow direction. The main flow maintained an over-expansion state, which dominated the inner flow of the ejector nozzle, and formed a shear layer structure with the secondary flow. With the increase of the NPR of the secondary flow, the flow rates of the secondary and third flows increased, which led to a stronger binding effect on the main flow. Therefore, the mainstream over-expansion phenomenon was effectively suppressed, so the thrust performance increased from 0.698 to 0.819.

     

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