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Flow Structure and Pressure Oscillations during the Interaction of a Supersonic Underexpanded Gas Jet with a Tubular Cavity
Technical Physics ( IF 0.7 ) Pub Date : 2020-08-31 , DOI: 10.1134/s1063784220080228
K. N. Volkov , V. N. Emel’yanov , A. V. Efremov , A. I. Tsvetkov

Abstract

Supersonic jets are widely used in devices based on a self-oscillation process emerging during the interaction of a gas flow with tubular cavities (gas-jet acoustic emitters). We analyze the mechanisms for sustaining undamped pulsations of pressure and determine the flow field in a tubular cavity during the interaction of an underexpanded supersonic jet with it. We consider the physical pattern of the flow in the cavity of a gas-jet emitter, demonstrate the existence of odd longitudinal modes, and propose wave diagrams for describing the flow in odd longitudinal modes. Wave diagrams are constructed based on analysis of signals from piezoelectric sensors detecting pressure pulsations in a tubular cavity. The flow parameters in the tubular cavity in the longitudinal modes are calculated using the flow velocity–velocity of sound diagram.


中文翻译:

超音速超膨胀气体射流与管状空腔相互作用时的流动结构和压力振荡

摘要

超音速射流广泛用于基于自激过程的设备,该过程在气流与管状腔体(气体射流声发射器)相互作用期间出现。我们分析了维持未阻尼压力脉动的机制,并确定了超音速超音速射流与其相互作用期间管状腔体中的流场。我们考虑了气体喷射器腔体中流动的物理模式,论证了奇数纵向模式的存在,并提出了描述奇数纵向模式中流动的波形图。波形图是基于对检测管状腔中压力脉动的压电传感器的信号进行分析而构造的。纵向模式下,管状腔中的流动参数是使用声速图的流速-速度来计算的。
更新日期:2020-08-31
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