| 摘要: |
| 通过数值模拟,分析了叶片周向弯曲对大折转角压气机叶栅内分离结构的影响。弯角分别为±10°,±20°,±30°。应用壁面流谱的拓扑法则,详细讨论了不同弯角下的分离形态。结果表明,正弯可以有效遏止角区分离,改变吸力面的分离形态,但不能完全消除吸力面的分离。因此一定范围内的叶片正弯可以改善流动,但当弯角大于20°时,流动重新恶化。反弯则使得叶栅内分离趋势增加,气动性能明显降低。 |
| 关键词: 大折转角+ 分离结构+ 周向弯曲+ 拓扑+ |
| DOI： |
| 分类号:V231.9 |
| 基金项目: |
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| Effect of bowed blades on the separation structures in high-turning compressor cascades |
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ZHANG Hua-liang1, WANG Song-tao2, WANG Zhong-qi3
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1.School of Energy Science and Engineering,Harbin Inst.of Technology,Harbin 150001,China;2.School of Energy Science and Engineering,Harbin Inst.of Technology,Harbin 150002,China;3.School of Energy Science and Engineering,Harbin Inst.of Technology,Harbin 150003,China
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| Abstract: |
| A numerical simulation was performed to analyze the effect of bowed blades on the separation structures in a high-turning compressor cascade.The bowed angles were ±10°,±20°,±30° respectively.Using the topological rules of the surface flow pattern,the separation configurations on the suction surface at different bowed angles is discussed.The results show that a positive bowed blade can restrain the corner separation and change the separation configuration,while it can not avoid the flow separation on the suction surface.So,although a positive bowed blade with a small angle can improve the flow performance,the flow becomes worse again when the positive bowed angle exceeds 20°.A negative bowed blade increases the flow separation and the flow performance is reduced remarkably. |
| Key words: High-turning+ Separation structure+ Bowed cascade+ Topology+ |
