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Pulsatory phenomenon in a thrust optimized contour nozzle

机译:推力优化轮廓喷嘴中的脉动现象

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摘要

A numerical study of the flow in an axisymmetric overexpanded thrust optimized contour nozzle is presented. The separation flow structures at different pressure ratios are investigated. The start-up process exhibits two different shock structures. For a range of pressure ratios, hysteresis phenomenon occurs between these two separation patterns. For a larger pressure ratio, where the principal separation point is always inside the nozzle, another phenomenon appears. This phenomenon results in an oscillatory longitudinal quasi periodic movement of the separation structure. The computed nozzle wall pressures show a correct agreement with the experimental measurements and the pulsations frequency of the oscillatory phenomenon is also well predicted.
机译:给出了轴对称超扩推力优化轮廓喷嘴内流动的数值研究。研究了不同压力比下的分离流结构。启动过程表现出两种不同的冲击结构。对于一定范围的压力比,在这两个分离模式之间会出现滞后现象。对于较大的压力比,主要分离点始终在喷嘴内部,这时会出现另一种现象。这种现象导致分离结构的纵向纵向准周期性振荡。计算出的喷嘴壁压力显示出与实验测量值的正确一致性,并且也很好地预测了振荡现象的脉动频率。

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