外源激励作用下火箭发动机输流管路振动特性研究

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振动与冲击 ›› 2024, Vol. 43 ›› Issue (2) : 60-70.

论文

苏勇1,何江2，张淼2，宫武旗1

作者信息 +

Vibration characteristics of a rocket engine flow pipeline under external excitation

SU Yong1，HE Jiang2，ZHANG Miao2，GONG Wuqi1

Author information +

文章历史 +

摘要

液氧煤油火箭发动机中煤油输送管路除受到管内高压流体自激激励外，还受到外来压力脉动、发动机主体振动等外源激励，因此经常发生强烈振动，已严重威胁火箭发动机安全。本文建立了包含波纹管、多段弯管和其他附属结构的三维管路模型，采用双向流固耦合方法，对输送管路的振动特性进行研究。研究结果表明，管道低频振动由流体自激的压力脉动引起，高频振动源于发动机主体振动，而外来压力脉动激励对管道振动无明显影响。另外，可视化结果表明热试车工况下，管道振动剧烈位置主要集中在进出口与两个波纹管之间，而波纹管、弯管和支撑处的应力值较大，是容易结构失效的危险位置，应重点关注。研究结果对发火箭发动机结构优化有积极意义。

Abstract

In addition to the self-excited excitation of high-pressure fluid in the tube, the kerosene pipeline in the liquid oxygen kerosene rocket engine is also subjected to external excitation such as external pressure pulsation and engine body vibration. Therefore, strong vibration often occurs, which has seriously threatened the safety of the rocket engine.In this paper, the vibration characteristics of the conveying pipeline are studied by using the established three-dimensional pipeline model including bellows, multi-section bends and other auxiliary structures, combined with the two-way fluid-solid coupling method.The results show that the low-frequency vibration of the pipeline is caused by the self-excited pressure pulsation of the fluid, and the high-frequency vibration is derived from the vibration of the engine body, while the external pressure pulsation excitation has no significant effect on the pipeline vibration.The visualization results show that the severe vibration position of the pipeline thermal test is mainly concentrated between the inlet and outlet and the two bellows.Bellows, elbows, and supports have high stress values, making them risky positions vulnerable to structural failure that need to be focused on. The findings of this study are significant in a good way for rocket engine structural optimization.

导出引用

苏勇1,何江2，张淼2，宫武旗1. 外源激励作用下火箭发动机输流管路振动特性研究[J]. 振动与冲击, 2024, 43(2): 60-70

SU Yong1，HE Jiang2，ZHANG Miao2，GONG Wuqi1. Vibration characteristics of a rocket engine flow pipeline under external excitation[J]. Journal of Vibration and Shock, 2024, 43(2): 60-70

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