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γ-Reθ转捩模型在风力机翼型数值计算中的应用

DOI: 10.3969/j.issn.1006-7043.201309013

Keywords: γ-Reθ转捩模型, 转捩动量厚度雷诺数, 间歇因子, 风力机, 翼型

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Abstract:

很多湍流模型忽略了层流区域的存在, 但实际流动在翼型某位置处开始转捩, 此时模型显然偏离实质, 计算结果精度较低。因此加入γ-Reθ转捩模型, 将转捩动量厚度雷诺数Reθ作为经验关联函数来控制边界层内间歇因子γ的生成, 再通过间歇因子来控制湍动能产生项, 使湍流模型在层流区域失效。首先为了验证数值计算的准确性, 采用上述方法针对风力机翼型A2121, 在高雷诺数4×106下对几种典型攻角的气动性能进行计算, 对比普通全湍流模型、湍流转捩模型和风洞试验的计算结果, 发现湍流转捩模型结果更精确。之后在更大攻角范围-10.14°~25.09°内, 采用此转捩模型数值方法进行气动仿真, 发现其总体计算结果与风洞试验实验数据较吻合, 验证了此数值方法的正确性和有效性。

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