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壁面湍流质量注入减阻效应的数值研究

DOI: 10.3969/j.issn.1006-7043.201312072

Keywords: 壁面湍流, RANS, 质量注入, 湍流模式, 减阻效应, 速度剖面, 湍动能, 涡粘系数

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Abstract:

为解释边界层质量注入减少摩擦阻力机理,采用雷诺平均纳维-斯托克斯方程,基于最近发展的的Wilcox k-ω湍流模式,对二维壁湍流质量注入进行了数值研究.计算得到的局部摩擦阻力系数与试验结果比较,表明该模式在该情况下具有较高的精度. 在其他参数保持不变的条件下,分有无质量注入2种情况,确认了质量注入会增加边界层厚度的膨胀效应,促进了边界层内湍流的发展程度,解释了减阻效应.通过速度剖面分布、湍动能及涡粘系数的分布比较,有助于加深人们对该流动现象的认识.

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