压气机叶片的带平台圆弧形前缘

Circular leading edge with a flat for compressor blades

关键词:  压气机叶片  前缘  带平台圆弧形前缘+  数值仿真

Key words:  Compressor blade  Leading edge  Circular leading edge with a flat~+  Numerical simulation

摘要:

带平台圆弧形前缘的研究是为了优化前缘形状,抑制前缘流动分离。研究中使用了数值模拟方法和氢气泡流动显示实验方法。对带平台圆弧形前缘设计参数做了定义,并讨论了参数选择的准则。此前缘特有的双吸力峰的强度远远弱于圆弧形前缘的单吸力峰。在不同攻角下,其削弱前缘吸力峰,抑制流动分离的效果不亚于椭圆形(长短轴比=2)前缘,而且对加工精度要求低,更适合工程实际应用。

Abstract:

To improve the leading edge shape, weaken the suction spike and reduce or eliminate the separation bubble, the circular leading edge with a flat was investigated both numerically by using CFD and experimentally by using hydrogen bubble visualization technique in a water tunnel. Definition and criteria for flat design are also discussed. It is found that the double suction spikes on the flat edges are much weaker than the single spike that appears on a circular leading edge. At high incidence, the separation on downstream of the leading edge is weaker in the case with a flat, and the blade performance is improved by comparing it with the case of circular leading edge without a flat. The improvement is similar to or better than that with an elliptical leading edge, but the circular leading edge with a flat has an advantage of being more tolerant with manufacturing inaccuracy thus more acceptable for the practical application than that with elliptic leading edge.