A STUDY OF THE FLOW STRUCTURE AROUND A CONSTANT-RATE PITCHING AIRFOIL
-
摘要: 本文通过在翼型上游和翼表面边界层内放置产生氢气泡的铂丝的方法,清楚地显示了上仰翼型分离剪切层的结构。揭示了在不同的翼型转动角速度范围内,存在三种分离流结构。研究了失速涡,剪切涡及起动涡随时间的演变,它们之间的相互作用和转动角速度等参数的影响,分离剪切层的流动显示结果,结合翼型上气动力与流场中涡量矩的关系的理论,定性地解释了上仰翼型产生非定常高升力的原因。Abstract: This paper presents a flow visualization study of the flow structure arounda constant-rate pitching airfoil using hydrogen bubble technique. It is shown that there exist three types of separated flow structure for different pitching rate. The time evolution of the dymamic stall vortex, shear layer vortices and trailing edge vortex is visualized, and their mutual interaction is studied. The flow visualization results, combining with theoretical analysis in literature, qualitatively explains the mechanism of ...
-
Key words:
- pitching airfoil /
- separated flow /
- dynamic stall /
- flow visualization
-
点击查看大图
计量
- 文章访问数: 1584
- HTML全文浏览量: 81
- PDF下载量: 577
- 被引次数: 0
下载:
