| Citation: | LAN Lei, LIN Zhengkang, HUANG Hexia, et al. Swirl characteristics of inward turning combined power inlet at low speed[J]. Journal of Aerospace Power, 2025, 40（9）：20240331 doi: 10.13224/j.cnki.jasp.20240331
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The swirl characteristics of the inward turning inlet under low incoming Mach number and the influences of inlet and outlet parameters were obtained by simulation. The results showed that at low speed, the flow coefficient of the inlet was large. Affected by the shape of the “V” lip, the encircling flow around the lip was significant, and there was a strong velocity gradient along the width direction. A pair of strong counter-rotating vortices were generated inside the lip, and gradually separated from the lip wall in the curved inner flow channel. When the incoming Mach number was low or the outlet Mach number was large (the flow coefficient was large), the vortex scale generated on the lip side was larger. The swirl angle of the outlet AIP (aerodynamics interface plane) cross section showed a “V” anti-symmetric distribution. With the increase of the outlet Mach number, it gradually developed into a “W” anti-symmetric distribution. The large-scale swirl angle extreme area merged with the small-scale swirl angle extreme area near the center of the pipeline, which increased the airflow distortion index. The swirl distortion index increased by about 1 times, and the circumferential total pressure distortion index increased by an order of magnitude.
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