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A review of impinging jets during rocket launching

机译：火箭发射过程中撞击式射流的回顾

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During rocket launching, the engine exhaust impinges on the launch structures, such as the launch platform and the jet deflector, leading to a complex flowfield and generating strong noise. The engine exhaust impingement induces large aerothermodynamic and acoustic loads on the launch structures and the rocket, the overload of which is a potential risk to the rocket launch. Thus, it is important to predict and reduce the loads. Although the jet impingement during rocket launching has been studied extensively, the jet impingement during rocket launching is a complex phenomenon, where multiple mechanisms are coupled. In most researches, several mechanisms are studied separately or in a partially-coupled way. Still, there are a lot of issues on the jet impingement remaining to be solved, especially when quantitative relations are taken into account.In this article, several issues involved are reviewed, to present an overview on progresses and perspectives of the jet impingement research for rocket launching. It starts with a summary of the results accessed for normal and inclined jets impinging on flat plates, then the interactive mechanisms between impinging jets and the launch platform or the deflector system, together with relevant factors that affect the flowfield and noise. Additionally, discussions on the interaction of impinging jets with multiphase flows are also presented.
机译：在火箭发射过程中，发动机废气撞击在发射结构上，例如发射平台和射流偏转器，导致流场复杂并产生强烈的噪音。发动机排气的撞击会在发射结构和火箭上产生很大的空气热力学和声学载荷，过载会给火箭发射带来潜在风险。因此，预测和减少负载很重要。尽管已经对火箭发射过程中的射流撞击进行了广泛的研究，但是火箭发射过程中的射流撞击是一个复杂的现象，其中多种机制耦合在一起。在大多数研究中，分别或以部分耦合的方式研究了几种机制。尽管如此，射流冲击仍有许多问题有待解决，尤其是在考虑到定量关系时。本文对其中涉及的几个问题进行了综述，以概述射流冲击研究的进展和前景。火箭发射。首先概述撞击在平板上的法向和倾斜射流的结果，然后是撞击射流与发射平台或导流板系统之间的相互作用机制，以及影响流场和噪声的相关因素。此外，还介绍了撞击射流与多相流相互作用的讨论。

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