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Controlled flow regime transition in a dual bell nozzle by secondary radial injection
Experiments in Fluids ( IF 2.4 ) Pub Date : 2020-11-08 , DOI: 10.1007/s00348-020-03086-3
L. Léger , V. Zmijanovic , M. Sellam , A. Chpoun

With the ever rising demands for cheaper payload delivery to orbit, dual bell nozzle with a potential theoretical performance gain of up to 10% can represents one of the major ways of advance to achieve the goal. The well-known transition unsteadiness in a dual-bell rocket nozzle represents one of the major concerns for the development of such altitude compensating type nozzle (ACN). The present study proposes and investigates the possibilities of secondary radial injection for flow regime transition control. Present experimental results demonstrate potential effects of secondary injection on transition and re-transition control even with a relatively low secondary injection mass flow rates. Doing so, the transition and retransition process were significantly delayed towards the ideal transition point. In addition, side loads have been found to be greatly decreased or even eliminated.

中文翻译:

通过二次径向喷射控制双钟形喷嘴中的流态转变

随着对更便宜的有效载荷输送到轨道的需求不断增加,具有高达 10% 的潜在理论性能增益的双钟形喷嘴可以代表实现目标的主要方法之一。众所周知,双钟罩火箭喷嘴的过渡不稳定性是开发这种高度补偿型喷嘴 (ACN) 的主要问题之一。本研究提出并研究了二次径向喷射用于流态转换控制的可能性。目前的实验结果表明,即使二次喷射质量流量相对较低,二次喷射对转变和再转变控制的潜在影响也是如此。这样做,过渡和重新过渡过程明显延迟到理想的过渡点。此外,
更新日期:2020-11-08
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