分离与再循环流动的壁面热规律

D. Cruz, A. P. Silva Freire
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引用次数: 0

摘要

本文研究了分离点附近湍流边界层的特性。重点给出了速度和温度近壁解的解析表达式,该解析表达式在逆流区也是有效的。然后,这些表达式可以用作使用双方程微分模型的数值格式中的边界条件。本文提出了一种描述近壁特征长度的新表达式,该表达式在逆流区也适用。指定的速度剖面是基于Cruz和Silva Freire (IJHMT, 41, 2097 - 2111, 1998)先前对问题的表述,但正如本文所写的那样,它们是第一次提出。壁面附近的温度分布也用一个新提出的表达式来描述,该表达式在附着区域中简化为对数分布,并在分离点处假设为负一半幂律分布。在分离区域,恢复对数剖面。所有结果都通过Vogel和Eaton (Trans.)的数据进行了验证。中华医学杂志,1997,922 - 929,1985)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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A Thermal Law of the Wall for Separating and Recirculating Flows
The characteristics of the turbulent boundary layer near a separation point are studied here. The emphasis is on providing analytical expressions for the velocity and temperature near wall solutions which are also valid in the region of reverse flow. These expressions can then be used as boundary conditions in numerical schemes that use two-equation differential models. The paper proposes a new expression for the description of the near wall characteristic length which is shown to hold also in the reverse flow region. The specified velocity profiles are based on a previous formulation of the problem by Cruz and Silva Freire (IJHMT, 41, 2097 2111, 1998) but, as written here, they are presented for the first time. The temperature profiles near the wall are also described by a newly proposed expression that reduces to the logarithmic profile in the attached region, and assumes a minus half power law profile at the separation point. In the separated region, the logarithmic profile is recovered. All results are validated through the data of Vogel and Eaton (Trans. ASME JHT, 107, 922 929, 1985).
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