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Supervised by Ministry of Industry and Information Technology of The People''s Republic of China Sponsored by Harbin Institute of Technology Editor-in-chief Yu Zhou ISSNISSN 1005-9113 CNCN 23-1378/T

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Related citation:Qinglin Niu,Biao Chen,Zhihong He,Jianfei Tong,Shikui Dong.Heat Transfer and Flow Characteristics Predictions with a Refined k-ε-fu Turbulent Model in Impinging Jet[J].Journal of Harbin Institute Of Technology(New Series),2019,26(4):9-17.DOI:10.11916/j.issn.1005-9113.17116.
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Heat Transfer and Flow Characteristics Predictions with a Refined k-ε-fu Turbulent Model in Impinging Jet
Qinglin Niu1, Biao Chen1,Zhihong He1, Jianfei Tong1,2,Shikui Dong1
(1. Key Laboratory of Aerospace Thermophysics, Ministry of Industry and Information Technology, Harbin Institute of Technology, Harbin 150001, China; 2. Dongguan Branch, Institute of High Energy Physics, Chinese Academy of Sciences, Dongguan 523803, Guangdong, China)
Abstract:
Local heat transfer and flow characteristics in a round turbulent impinging jet for Re≈23 000 is predicted numerically with the RANS approach and a k-ε-fu turbulence model. The heat transfer predictions and turbulence parameters are verified against the axis-symmetric free jet impingement measurements and compared with previous other turbulence models, and results show the k-ε-fu model has a good performance in predictions of the local wall heat transfer coefficient, and in agreement with measurements in mean velocity profiles at different radial positions as well. The numerical model is further used to examine the effect of the fully confined impingement jet on the local Nusselt number. Local Nusselt profiles in x and y-centerlines for the target plate over three separation distances are predicted. Compared with the experimental data, the numerical results are accurate in the central domain around the stagnation region and present a consistent structure distribution.
Key words:  heat transfer  impingement flow  k-ε-fu turbulence model  Nusselt number
DOI:10.11916/j.issn.1005-9113.17116
Clc Number:TK124
Fund:
Descriptions in Chinese:
  

基于改进的k-ε-fu湍流模型的冲击射流换热特性数值分析

牛青林1,陈彪1,贺志宏1,童剑飞1,2,董士奎1

(1.哈尔滨工业大学,工信部空天热物理重点实验室,哈尔滨 150001;2.中国科学院,高能物理研究所东莞分部,广东 东莞 523803)

创新点说明:

1)采用改进的k-ε-fu湍流模型对射流冲击平板换热问题进行分析,并与实验结果和众多现有其他模型进行对照,验证了本模型的优越性。

2) 对受限空间内的射流冲击问题进行不同冲击距离下换热特性的研究,并与实验结果进行对照。

研究目的:

为解决射流冲击换热计算中湍流模型预测精度较低,以及验证k-ε-fu湍流模型在预测自由和受限空间射流冲击问题方面的可靠性。

研究方法

通过有限体积法求解雷诺平均的N-S方程,采用k-ε-fu湍流模型对雷诺数为23000的自由射流冲击平板算例进行计算,并与实验和其他湍流模型结果进行对照。基于该湍流模型,数值分析了受限空间内不同冲击距离下的射流冲击换热问题,并与实验结果进行对照。

结果:

1)自由射流冲击平板算例中,k-ε-fu湍流模型在整个计算域内对努塞尔数的预测结果与实验结果吻合较好。

2)k-ε-fu湍流模型在受限空间内射流问题中,能准确获得射流中心范围内的换热系数,并能捕获周围区域的努塞尔数分布趋势。

结论:

k-ε-fu湍流模型在Re≈23000的自由射流冲击平板换热方面具有优越的预测能力,且能较准确预测受限空间射流的流动特征结构。

关键词:

传热,冲击射流,k-ε-fu湍流模型,努塞尔数

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