| Citation: | LIU Zhimin, YAN Panpan, ZHANG Qunfeng, et al. Unsteady flow characteristics of dorsal inlet under low-energy inflow[J]. Journal of Beijing University of Aeronautics and Astronautics, 2019, 45(4): 672-680. doi: 10.13700/j.bh.1001-5965.2018.0573(in Chinese)
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To improve the dorsal S-shaped inlet flow performance of low-energy inflow.The flow fields of both original and improved dorsal inlet were studied by using improved delayed detached-eddy simulation (IDDES) method, and the mass flow and pressure fluctuation characteristics of the two inlets were compared. The results show that, influenced by the fuselage, airflow turning angle near the inlet lip is very large and this will cause the formation of separation bubbles. The intensity of the separation vortex at the lip of the original inlet is very high. When the separation bubbles with high energy break down at the top of the inlet, massive high-strength vortices are created. These high-strength vortices aggravate the separation near the inlet top and cause fierce pressure fluctuations inside the S-shaped inlet. The amplitude of the sound pressure level can reach 145 dB. The strength of separation bubbles inside the improved inlet issuccessfully decreased, which enlarges the effective flow area of the inlet and increases mass flux. The pressure fluctuations inside the S-shaped inlet decrease and the reduction of sound pressure level is up to 8 dB. Meanwhile, the comprehensive distortion coefficient decreased by 9.5% which improves the characteristic of outlet flow field.
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