| Citation: | Gao Wenzhi, Yang Xicheng, Pei Chongzhi, et al. Suppression of shock train oscillation based on upstream wavy wall[J]. Journal of Aerospace Power, 2026, 42（X）：20250370 doi: 10.13224/j.cnki.jasp.20250370
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The effects of wavy walls on the suppression of shock train oscillations were investigated in a 32 mm high rectangular isolator under Mach 3 freestream flow. High-speed schlieren imaging and transient pressure measurements were employed to capture the shock train oscillation flow, which was induced with flat wall and sinusoidal wavy wall (with amplitudes from 0.25 mm to 1 mm) through steady throttle and 50 Hz to 250 Hz periodic throttle. For steady throttle flow, the shock train exhibited self-excited oscillation within small range. Wavy walls significantly altered the pressure signal spectrum and reduced the root mean square of wall pressure. 1 mm-wavy wall reduced the oscillation range of the leading-edge-shock. For periodic throttle flow, forced shock train oscillation emerged and wavy walls reduced the root mean square of pressure within the oscillation region. As the throttle frequency increased, the effects of 0.25 mm and 0.5 mm-wavy walls on the oscillation transferred from enhancement to suppression. Meanwhile, the 1 mm-wavy wall consistently led to an increase in the oscillation range. Overall, 0.25 mm-wavy wall exhibited the optimal suppression effects. Specifically, 0.25 mm-wavy wall reduced the oscillation range of 250 Hz condition by 32.2%. The analyses showed that the interference wave system and wake vortex effects induced by the wavy wall reduced the Mach number and total pressure recovery coefficient of the downstream flow, and generated regions of positive and negative pressure gradients on the downstream wall surface. For the present configuration, a small amplitude (0.25 mm) wavy wall can suppress shock train oscillation with a minimal drop of flow total pressure through vortex effects and variations of pressure gradient. It is necessary to consider the parameter matching between the wavy wall configuration and shock train oscillation flow in the practical application.
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