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首页> 外文期刊>Engineering Applications of Computational Fluid Mechanics >Principal Parameters in Flow Separation Patterns of Over-Expanded Single Expansion RAMP Nozzle
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Principal Parameters in Flow Separation Patterns of Over-Expanded Single Expansion RAMP Nozzle

机译：超膨胀单膨胀RAMP喷嘴的流分离模式中的主要参数

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AbstractThe paper investigates the loss of performance due to flow separation in an over-expanded single expansion ramp nozzle (SERN) during the startup and shutdown process. Characterization of the performance of SERN in this flight regime is complicated as the high degree of asymmetry in the geometry of SERN results in asymmetric separation patterns. In this investigation, the various separation patterns of SERN have been studied by way of numerical simulations. The characteristics of the over-expanded separation patterns have been detailed, and the effects of the critical parameters, such as the length of the flap, the expansion ramp angle and the Mach number, have been analyzed. The outcome of the simulations indicates that restricted shock separation (RSS) accounts for the largest range of over-expanded pressure ratios. The length of the flap can affect the separation patterns, and RSS on the flap does not occur for a short flap SERN. Moreover, with the ramp angle larger than 27 degrees, RSS on the r...
机译：摘要本文研究了在启动和关闭过程中由于过度膨胀的单膨胀斜面喷嘴（SERN）中的流动分离而导致的性能损失。在这种飞行状态下，SERN的性能表征十分复杂，因为SERN几何形状的高度不对称会导致不对称的分离模式。在这项研究中，已通过数值模拟研究了SERN的各种分离模式。详细介绍了过度膨胀分离模式的特性，并分析了关键参数（如襟翼的长度，膨胀斜角和马赫数）的影响。模拟结果表明，受限的冲击分离（RSS）导致了最大范围的过度膨胀压力比。阀瓣的长度会影响分离模式，对于较短的阀瓣SERN，阀瓣上的RSS不会发生。此外，当倾斜角度大于27度时，RS ...

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