PDE出口爆轰波与射流诱发水中流场变化规律的数值仿真

Numerical Simulation of the Underwater Flow Field Induced by Detonation Wave and Jet from Pulse Detonation Engine Outlet

为研究脉冲爆轰发动机(PDE)在水下爆轰后的复杂流场特性,基于Mixture多相流模型原理,建立了PDE管外轴对称流场的多相流爆轰理论模型,采用Simple算法对燃气喷射进入流场的过程进行了数值仿真,研究了气泡的形成和发展过程,以及射流初期流场特性,分析了射流喷射过程中出现的颈缩与回流现象,讨论了射流喷射过程中流场的压力、速度等参数分布以及变化规律。仿真结果表明,爆轰波在水下会引起水流场产生强烈的掺混效应并伴随一些复杂的激波结构,射流在水中会产生胀鼓、颈缩现象。文中的研究可为水下PDE性能研究提供理论参考。

To reveal the complex flow field characteristics after underwater detonation of the pulse detonation engine （PDE）, a theoretical model of multi-phase detonation out of PDE tube was established following the principle of Mixture multiphase flow model. The Simple algorithm was used to simulate the process of gas injecting into the flow field. The formation and development of bubbles and the characteristics of initial flow field were investigated. The phenomena of neck shrinkage and reflow during jet injection were analyzed. And the distribution and variation of pressure and velocity in the flow field were discussed. Numerical simulation shows that underwater detonation waves make the flow field produce a strong blending effect with some complex shock structures, and the jet in the water produces bulging and necking phenomena. This study may provide theoretical guidance for performance research of underwater PDE.