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首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers >Numerical investigation of the effects of base size on supersonic flow through a sudden duct enlargement
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Numerical investigation of the effects of base size on supersonic flow through a sudden duct enlargement

机译：管道突然扩大时基体尺寸对超音速流动影响的数值研究

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An abrupt increase in duct cross-section is often found in pressure-reducing devices, valves of internal-combustion engines, flow control devices in pipe systems of power plants, launch tubes of the ballistic ranges, thrust augmentation systems for cruise missiles, zero secondary flow ejectors, etc. The objective of this study is to revisit the classical base flow fields in a wall-bounded supersonic flow past a sudden expansion, to study and exploit their dependence on the size of the enlarged part - termed as the base size. Two-dimensional numerical simulations are performed for a nozzle flow, which is suddenly expanded in a larger rectangular channel. Five different turbulence models have been utilized in this study. Flow determination near the base is influenced by the proper selection of the turbulence model. The numerical solutions are compared with available experimental data and good agreement is achieved with renormaliza-tion group k-ε turbulence model. This investigation is concerned with the determination of the base size, for which the jet characteristics and the base pressure become independent of the size of the enlarged part. For a given duct, base pressure tends to a minimum for a particular pressure ratio. In this study, the authors have been able to link the jet characteristics to the base size by both analytical and numerical methods. This has led to the conclusion that for a constant driving pressure, the base pressure asymptotically decreases when the base size is increased up to a critical value, and it becomes independent of the base size thereafter. It is believed that the results of this study can provide a better understanding of the wall-bounded supersonic flow past a sudden expansion. The relevance of the present observations in some of the engineering applications is also discussed.
机译：通常在减压装置，内燃机的阀门，发电厂的管道系统中的流量控制装置，弹道范围的发射管，巡航导弹的推力增强系统，零级辅助系统中发现导管横截面的突然增加。这项研究的目的是重新审视壁面超音速流中突然膨胀后的经典基础流场，以研究和利用它们对扩大部分的大小的依赖性（称为基础大小）。对喷嘴流进行二维数值模拟，喷嘴流突然在较大的矩形通道中扩展。这项研究使用了五种不同的湍流模型。基座附近的流量确定受湍流模型的正确选择影响。将数值解与可用的实验数据进行了比较，并且使用重归一化组k-ε湍流模型获得了良好的一致性。该研究涉及确定基础尺寸，为此确定喷射特性和基础压力与扩大部分的尺寸无关。对于给定的管道，对于特定的压力比，基本压力趋于最小。在这项研究中，作者已经能够通过分析和数值方法将射流特性与基本尺寸联系起来。由此得出结论，对于恒定的驱动压力，当基本尺寸增大到临界值时，基本压力逐渐减小，并且此后变得独立于基本尺寸。可以相信，这项研究的结果可以更好地理解壁垒超音速流动经过突然的膨胀。还讨论了当前观察结果在某些工程应用中的相关性。

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