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This paper investigates the impact of shock trains on the flow dynamics and efficiency of mixed compression air intakes. The study explores a range of Air Intake Back Pressure Ratios (BPR) from 3 to 6. The simulations are conducted at a free stream Mach Number of 2.2 using RANS equations implemented in Ansys CFD Package. Specifically, the K-omega SST turbulence model is employed to accurately capture wall separation phenomena within the intake. The formation and behaviour of shock trains are scrutinized, revealing their substantial influence on the flow field within the duct and consequent deterioration of intake performance. Findings indicate that higher BPR ratios correspond to increased pressure losses, with a maximum loss of 25% observed at a BPR of 5 and a minimum loss of 6% at a BPR of 6. Moreover, shock trains induce significant flow distortion within the duct, exacerbating overall flow irregularities.

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Numerical Study of Shock Train Effects on Mixed Compression Air Intake Performance

  • 会议论文

  • 发表日期：

    2026年

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  • G. P. Bagri,
  • Madhav Sehgal,
  • Devabrata Sahoo,
  • Narender Singh,
  • R. K. Saluja,
  • Neeraj Kumar Gahlot

摘要

This paper investigates the impact of shock trains on the flow dynamics and efficiency of mixed compression air intakes. The study explores a range of Air Intake Back Pressure Ratios (BPR) from 3 to 6. The simulations are conducted at a free stream Mach Number of 2.2 using RANS equations implemented in Ansys CFD Package. Specifically, the K-omega SST turbulence model is employed to accurately capture wall separation phenomena within the intake. The formation and behaviour of shock trains are scrutinized, revealing their substantial influence on the flow field within the duct and consequent deterioration of intake performance. Findings indicate that higher BPR ratios correspond to increased pressure losses, with a maximum loss of 25% observed at a BPR of 5 and a minimum loss of 6% at a BPR of 6. Moreover, shock trains induce significant flow distortion within the duct, exacerbating overall flow irregularities.