适用于发动机散热器的壁面函数改进

doi:10.13229/j.cnki.jdxbgxb201703016

摘要/Abstract

摘要： 在发动机散热器的数值计算中,需要对壁面函数进行改进。为了构造一种适用于发动机散热器的壁面函数,对标准壁面函数(SWF)进行混合处理并引入压力梯度影响系数,构造了一种改进的混合型壁面函数(IBWF)。基于一款管带式散热器,在Fluent中应用IBWF及不同近壁处理方法进行了数值模拟,并在RWT800散热器性能试验风洞中进行了试验验证。结果表明:与SWF相比,IBWF对压降和温差的预测误差分别减小了9.1%和14.5%,并节省了一半以上的求解时间,为散热器数值计算提供了一种更经济、可靠的近壁处理方法。

关键词: 动力机械工程, 壁面函数, 散热器, 数值模拟

Abstract: The accuracy of wall functions needs improvement for near-wall flow in engine radiators. In order to make wall functions suitable for engine radiators, Improved Blended Wall Functions (IBWFs) were customized by blending the Standard Wall Functions (SWFs) and introducing influence coefficients of pressure gradients. Numerical simulations were conducted in Fluent. In the simulations, different near-wall treatments including IBWFs were applied on a tube-and-corrugated- fin type radiator. Experimental verifications were carried out in RWT800 radiator wind tunnel . The results indicate that the IBWFs save more than half of computational time of SWFs, meanwhile, the deviations of pressure drop and temperature differences between inlet and outlet decrease 9.1% and 14.5% respectively. The IBWFs provide a more efficient and reliable near-wall treatment for radiator numerical simulations.

Key words: power mechanical engineering, wall functions, radiator, numerical simulation

中图分类号:

TK422

彭玮, 李国祥, 闫伟. 适用于发动机散热器的壁面函数改进[J]. 吉林大学学报(工学版), 2017, 47(3): 804-810.

PENG Wei, LI Guo-xiang, YAN Wei. Improvement in wall functions for engine radiators[J]. 吉林大学学报(工学版), 2017, 47(3): 804-810.

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