本文通过调整叶型中线分布设计了几种不同的跨音转子，并采用数值模拟的方法研究了其对跨音转子流场性能的影响。研究结果表明，高来流马赫数下跨音转子流场对叶型中线分布比较敏感，中线分布应尽可能保证负荷的平稳加载和预期的气流折转；跨音转子叶根区域仅在前缘附近存在局部超音区，较大的叶型折转对流场影响不大；其叶尖区域主要依靠激波增压且易诱发边界层分离，在设计中该区域的叶型折转应尽可能小，且应将叶型的折转主要集中在通道激波后的扩张段；跨音转子设计中，其最大厚度点之后的中线折转比重采用由叶根沿展向逐渐增大的分布规律可有效地降低流动分离损失；通道激波后出现的局部加速区有助于压制激波诱导的边界层分离。
Five transonic rotors with different camber line distribution were designed to investigate the effect of camber line distribution by numerical simulation method in this paper. The predicted results indicate that the flowfield is sensitive to the variation of camber line when inlet condition with high Mach number is imposed, and it should be adapted for the camber line to achieve a smooth loading distribution and anticipative flow deflection. Only local supersonic region exists near the leading edge of sections at the root area where larger profile camber angle can be afforded. However, the turning of profile at the tip should be much smaller and mainly focus on diffusion region behind the passage shock because of pressure rising by shock and easy-induced boundary separation. The spanwise turning proportion of camber line on the rotor should gradually increase from hub after the point with maximum thickness to minimize separation loss. In addition, the local acceleration area appeared behind the passage shock benefits to the suppression of boundary separation induced by shock.
参考文献
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