Abstract

In high-pressure gas–jet Hartmann generators, the source of acoustic energy is kinetic energy of a gas jet by the supercritical ratio between the operation and ambient pressure. Under certain conditions, onflow of a supersonic jet to a resonator is accompanied by powerful self-sustained oscillations with irradiation of acoustic waves into the environment and resonator cavity. A model of a self-oscillating process arising from the interaction of a nonisobaric jet with semi-closed cylindrical cavities is considered, which allows one to identify typical elements of the gas-dynamic structure of the forming flow. The physical pattern of the flow in the gas–jet generator has been discussed and the study of the dependence of the self-sustained oscillation characteristics on the key gas-dynamic and geometric parameters has been performed.

中文翻译：

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超音速超膨胀射流与圆柱腔相互作用引起的自持振荡的声学特性

摘要

在高压气体喷射Hartmann发生器中，声能的来源是气体喷射的动能，其大小取决于运行压力与环境压力之间的超临界比。在某些条件下，超音速喷射流进入谐振器会伴随着强大的自持振荡，并向环境和谐振器腔内辐射声波。考虑了一种由非等压射流与半封闭圆柱体腔相互作用产生的自激过程的模型，该模型可以识别成形流的气体动力结构的典型要素。讨论了气体喷射发生器中流动的物理模式，并研究了自持振荡特性对关键气体动力学和几何参数的依赖性。