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压气机叶片前缘形状与局部损失相关性

DOI: 10.3969/j.issn.1006-7043.201402014

Keywords: 压气机, 叶片造型, 椭圆形前缘, 前缘, 曲率, 局部损失, 切向速度, 速度分布

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Abstract:

压气机叶型的椭圆形前缘相比传统圆弧形前缘能减小流动损失,扩大攻角范围,但加工难度提高.为了尽可能减少加工成本、充分利用椭圆形前缘的气动优势,研究了在不同来流条件下椭圆形前缘与圆弧形前缘的气动性能差异.利用椭圆方程重新设计CDA叶型的前缘;引入SST湍流模型加γ-θ转捩模型对计算模型进行数值模拟,分析叶片前缘的切向速度与熵分布;研究了叶片前缘曲率与局部流动损失的相关性,并详细比较了在不同来流条件下椭圆形前缘与圆弧形前缘的气动性能.分析结果表明,在攻角小于2°的正攻角、较高来流马赫数、较低来流湍流度与雷诺数条件下椭圆形前缘优势更明显.

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