ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Typical aerodynamic characteristics and flow mechanisms of dorsal inlet
Received date: 2025-05-28
Revised date: 2025-06-04
Accepted date: 2025-06-16
Online published: 2025-06-27
Supported by
National Natural Science Foundation of China(12302299);National Key Laboratory Foundation of Ramjet(2023-JCJQ-LB-018-007)
Numerical simulations were conducted to investigate the flow characteristics and flow formation mechanism of a typical layout of dorsal binary curved compression inlet at different angles of attack. The results show that the flow coefficient of the inlet and the total pressure recovery coefficient of the throat decrease simultaneously with the increase of the angle of attack， and the flow coefficient decreases by 24.4% and the total pressure recovery coefficient decreases by 14.8% when the angle of attack increases from 0° to 10°. The boundary layer diverter can effectively improve the flow coefficient and total pressure recovery coefficient of the inlet channel， the flow coefficient increases by about 4%， and the total pressure recovery coefficient of the throat channel increases by about 0.02. The analysis of the study shows that， with the increase of the angle of attack of the flight， the masking effect of the forebody on the dorsal inlet induces the appearance of the forebody expansion wave， which causes the acceleration of the airflow in front of the inlet. The higher Mach number and uneven distribution in front of the inlet are the main reasons for the simultaneous decrease of the flow coefficient and the total pressure recovery coefficient. Accordingly， a theoretical model of the flow characteristics of the forebody/inlet for this type of dorsal layout is established， which reveals the linear correlation between the Mach number in front of the inlet and the angle of attack， which can be used to predict the flow characteristics of the inlet accordingly. By changing the relative position of the inlet along the flow direction in the forebody， the influence of the boundary layer on the inlet flow can be improved， and the flow coefficient and total pressure recovery coefficient can be enhanced， but the enhancement is limited due to the fact that the Mach number in front of the inlet is still high and unevenly distributed.
Shanchao YANG , Hongyin LONG , Huacheng YUAN . Typical aerodynamic characteristics and flow mechanisms of dorsal inlet[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2025 , 46(24) : 632314 -632314 . DOI: 10.7527/S1000-6893.2025.32314
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