自激振荡气蚀射流喷管内水声学理论及其应用

Hydroacoustics of Self--excited and Cavitating Jet Pipe and Its Application

本文阐述了自激振荡气蚀射流动力学的研究内容、现状及发展趋势．利用流体瞬变流和水声学理论分析了自激振荡气蚀射流喷管内的流动规律，建立了喷管内水声学特性的特征方程，并给出了数值解．分析了外界扰动波在喷管内的传播规律，为优化设计喷管结构和实现无源控制射流流场提供了理论依据，并在此基础上，给出了适合钻头的自激振荡气蚀射流喷管的设计模式，计算结果表明在钻头体有限空间内安装自激振荡气蚀射流喷管，管子阶数不宜超过２，喷管出口直径最好在３～７毫米内。

Research contents present state and development tend of self-excited pulsing and cavitating jet dynamics is described. Theoretical analysis of the jet feed pipe flow is given on the basis of fluid transient and hydroacoustics. Characteristic equation of internal hydroacoustics of the jet pipe is established and numerically solved. A design theory of selfexcited and cavitating jet pipe for tri-cone roller bit is established. And the propegstjon of hydroacoustic standing wave in the feed pipe is analyed, providing theoretical basis for optimization of the jet pipe configuration and passive control the jet flowfield. Numerical results show that the model number of the jet pipe is not more than two and the outlet diameter prefers to 3～7mm.