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首页> 外文期刊>International Journal of Heat and Fluid Flow >Large-Eddy simulation of an impinging heated jet for a small nozzle-to-plate distance and high Reynolds number
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Large-Eddy simulation of an impinging heated jet for a small nozzle-to-plate distance and high Reynolds number

机译：喷嘴到板的距离短且雷诺数高时，撞击热射流的大涡模拟

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This paper reports on the investigation of an original impinging jet configuration through a wall-resolved large eddy simulation. The heated jet issues from a fully developed pipe flow at temperature of 130 degrees C and a Reynolds number based on the bulk velocity of 60000. The impinged plate is located three diameters downstream of the pipe exit. The CFD results have been validated against a specifically-created experimental database (Grenson et al., 2016). The overall statistical fields are well retrieved by the simulation both in the free jet and the wall jet region. In particular, the secondary maximum at the radial location r/D = 2 in the Nusselt number distribution is well predicted by the simulation. The underlying mechanisms from which the secondary maximum originates has been investigated. This analysis revealed that small-scale hot spots of strong convective heat transfer coefficient are responsible for the emergence of this secondary maximum. It is shown that the hot spots can be associated either to local unsteady "separation" of the flow or streaks-like structures above the impinging plate.
机译：本文报告了通过壁解析大涡模拟对原始撞击射流构型的研究。加热后的射流是由温度为130℃的充分发展的管道流和基于60000的整体速度的雷诺数产生的。受冲击的板位于管道出口下游的三个直径处。 CFD结果已针对专门创建的实验数据库进行了验证（Grenson等，2016）。通过模拟，可以在自由射流和壁射流区域中很好地检索总体统计字段。尤其是，通过模拟可以很好地预测Nusselt数分布在径向位置r / D = 2处的次要最大值。已经研究了次要最大值产生的潜在机制。该分析表明，具有强对流传热系数的小规模热点是造成该次要最大值的原因。示出的是，热点可能与流的局部不稳定的“分离”或在撞击板上的条纹状结构有关。

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