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首页> 外文期刊>Aerospace science and technology >Relation between shock unsteadiness and the origin of side-loads inside a thrust optimized parabolic rocket nozzle
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Relation between shock unsteadiness and the origin of side-loads inside a thrust optimized parabolic rocket nozzle

机译：推力优化的抛物线形火箭喷嘴内部冲击不稳定与侧向载荷起源之间的关系

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摘要

An experimental test campaign has been carried out on a sub-scale thrust optimized parabolic (TOP) nozzle to study the relation between unsteady characteristics of separation and reattachment shocks and the origin of side-loads in rocket nozzles. The study was conducted using wall pressure measurements both in streamwise and circumferential directions, surface oil visualization technique and signals from strain gauges installed on the nozzle bending tube. It is observed that the nozzle pressure ratio at which peaks in maximum rms values occur, for separation and reattachment shocks, coincide with the nozzle pressure ratio at which peaks in strain gauge signal are observed. This clearly demonstrates the unsteady nature of separation and reattachment shocks to be directly related to origin of side-loads in rocket nozzles.
机译：在次尺度推力优化的抛物线形（TOP）喷嘴上进行了实验测试，以研究分离和重装冲击的非稳态特性与火箭喷嘴中的侧向载荷来源之间的关系。这项研究是利用沿流向和周向的壁压测量，表面油可视化技术以及安装在喷嘴弯曲管上的应变仪的信号进行的。观察到，对于分离和重新附着冲击，在最大均方根值处出现峰值的喷嘴压力比与在应变仪信号中观察到峰值的喷嘴压力比一致。这清楚地证明了分离和重新附着冲击的不稳定性质，与火箭喷嘴的侧向载荷的产生直接相关。

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