| Citation: | WEN Y F，ZHANG W Q，HAO S S. Investigation on unsteady flow characteristics of a supersonic inlet with exit blocked[J]. Journal of Beijing University of Aeronautics and Astronautics，2025，51（3）：772-783 （in Chinese） doi: 10.13700/j.bh.1001-5965.2023.0142
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Cavity flow oscillation phenomenon would occur during the transiton of ramjet with the inlet entrance unobstructed while its exit blocked. As the flow oscillating dramatically, the flight vehicle would face a crisis of instability attitude controlling and structural failure. Due to the problem of fluctuation flow, the unsteady flow characteristics of a supersonic twin-duct inlet with its exit blocked were studied by wind tunnel test and numerical simulation. The effects of the model scale, Mach number of the incoming flow, and boundary layer suction on the characteristics of oscillating pressure of the inlet were acquired. The results indicate that periodic oscillating flow is observed when the exit of the inlet is blocked. The frequency of the oscillating flow is positively correlated to the acoustic velocity of the incoming flow but inversely correlated to the length of the inlet. The oscillating pressure peak is found to approximate the total pressure value of the incoming flow, and it raises obviously with the increment of the Mach number of the incoming flow. The unsteady flow of the inlet with its exit blocked is approximately simulated by the numerical method adopted in this paper, and the numerical simulation result agrees well with that of the wind tunnel test. Furthermore, unsteady simulation results show that the inlet’s pressure is relieved in the duration of flow oscillation by conducting the boundary layer suction method at the internal contracted region, which results in a shock-on-lip state during the backward movement of the shock wave system. A rise of captured flow coefficient is observed when compared to the inlet without boundary layer suction, leading to a 49.47% increase of amplitude peak while 21.78% descending of the frequency for the oscillating pressure.
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