| Citation: | TONG Jiahui, LI Bo, SU Jiayin, et al. Design and performance of serpentine inlet with bypass[J]. Journal of Aerospace Power, 2023, 38（5）：1166-1175 doi: 10.13224/j.cnki.jasp.20210608
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The aerodynamic design and performance simulation of a serpentine inlet with bypass were studied. The influence of alternating the first S-bend length on the inlet was explored. Through the analysis of the flow field and sand particles trajectories, the protype was modified. Then, on the basis of the modified benchmark model, the influences of different scavenge flow ratios and transition section area ratios on flow characteristics and sand separation efficiency in the inlet duct were emphatically studied by means of numerical simulation. The results showed that if the length of the first S-bend was too small, the aerodynamic performance was better but not favorable for sand separation; if the length was too large, the aerodynamic performance was worse but the sand separation effect was better. In the process of decreasing transition area ratio, the aerodynamic performance of inlet decreased slightly. When separation vortices were formed, the total pressure loss increased rapidly, but the outlet total pressure distortion coefficient decreased. And too large or too small area ratio was not conducive to the sand separation of inlet. With the increase of scavenge flow ratio, the performance of sand separation efficiency was improved, the total pressure recovery at the outlet was basically stable and the distortion was increased.
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