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Numerical study of impinging jets heat transfer with different nozzle geometries and arrangements for a ground fast cooling simulation device

机译:地面快速冷却模拟装置不同喷嘴几何形状和布置的冲击射流传热的数值研究

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摘要

In this paper, a comparative study is performed to check the nozzle geometry and arrangement effects on impinging jets heat transfer performance to help the design of a ground fast cooling simulation device which is used for the thermal tests of high speed flight vehicles. Based on the simplified physical model, the impinging jets heat transfer is modeled using the shear-stress transport (SST) k-ω turbulence model. A total of 21 different nozzle configurations including 7 geometries are considered in the numerical simulation. Heat transfer performances concerning heat transfer intensity and heat flux uniformity in different cases are compared with each other. Analysis is given on the corresponding flow fields and surface heat flux distributions. To help the optimization of nozzle geometry and arrangement in designing the device, an indicator named QU ratio is proposed for the overall performance evaluation of the nozzle configurations. The effectiveness of the QU ratio is validated based on the numerical results and it can be used to help determine the best design for certain given conditions of the ground fast cooling device.
机译:在本文中,进行了一项比较研究,以检查喷嘴几何形状和布置对撞击射流传热性能的影响,以帮助设计用于高速飞行器热测试的地面快速冷却模拟设备。基于简化的物理模型,使用切应力传输(SST)k-ω湍流模型对射流的传热进行建模。在数值模拟中考虑了总共21种不同的喷嘴配置,包括7种几何形状。比较了不同情况下有关传热强度和热通量均匀性的传热性能。分析了相应的流场和表面热通量分布。为了在设计设备时帮助优化喷嘴的几何形状和布置,提出了一种名为QU比率的指示器,用于评估喷嘴配置的整体性能。根据数值结果验证了QU比率的有效性,它可用于帮助为地面快速冷却设备的某些给定条件确定最佳设计。

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