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摘要
Based on the dynamic mesh method, the shock train oscillation flows of a two-dimensional inlet/isolator configuration caused by periodical throttle at frequencies from 50 to 500 Hz were investigated through numerical simulations under Mach number 6 freestream. The results showed that evident shock train oscillations appeared as the throttling ratio varied periodically within the range of (0.2? 0.32), and the oscillation frequency accorded with the throttling disturbance frequency. The throttling frequency evidently affected the oscillation amplitude of the shock train and the characteristics of the wall pressure fluctuation. The oscillation ranges of shock train decreased with the increase of throttling frequency higher than or equal to 100 Hz, despite of the similar values between 50 Hz and 100 Hz conditions. The streamwise oscillation range was 15.5 mm and 10.8 mm under 100 Hz and 500 Hz conditions, respectively. Variation law of wall pressure with throttling frequency was complex. Time-averaged magnitudes and mean square deviations of the wall pressures decreased as the throttling frequency increased for the upstream section of the central part of cavity, while the variation laws of wall pressure were ambiguous for the downstream section. The highest square mean deviation was 21 times the freestream static pressure for the cowl sidewall pressure under 50 Hz condition. The analyses showed that variations of shock train oscillation with frequency were related to the response time of inlet/isolator flows to throttle disturbances. It is necessary to comprehensively consider the influences of configurations and back pressure parameters on shock train oscillation in engineering design. ? 2023 BUAA Press.
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