Wall Pressure Distribution Induced by Saw-Tooth Flap
-
摘要: 在风洞用电子扫描阀进行测压,研究了绕平板扰流片和锯齿扰流片分离流动的壁面压力分布.结果表明平板扰流片和锯齿扰流片均在上游x/h=-6处剪切层开始分离,并再附于下游x/h≈20的位置.锯齿扰流片横向位置的变化对壁面平均压力分布几乎没有影响,但通过锯齿槽流向的压力脉动一般大于通过锯齿尖点流向的脉动.从平均压力分布看,锯齿高度可以增加扰流片阻流效果,采用锯齿扰流片可以减小下游壁面压力的脉动.Abstract: Wall pressure distribution induced by the saw-tooth flap has been investigated with electronic pressure scanner in wind tunnel. The results showed that the shear layer of the saw-tooth flap separated at x/h=(6 upstream and reattached at x/h≈20 downstream, which is the same with the plate flap; The transverse location of the flap has little influence on the mean pressure distribution, and the distribution of pressure fluctuation along the saw-tooth groove is greater than that along the saw-tooth tip; The saw-tooth can block the flow and much more effectively reduce the pressure fluctuation downstream.
-
Key words:
- flow separation /
- saw-teeth /
- pressure distribution /
- flow reattachment /
- flap
-
[1] Everitt K W. A normal flat plate close to a large plane surface[J]. Aero Quarterly, 1982, 33(1):90~104. [2]Yeung W W. Reduction of transient adverse effect of spoilers[J]. J of Aircraft, 1997, 34(4):479~484. [3]Yeung W W, Xu C,Gu W D. Separated flows around spoilers and forward-facing flaps[J]. J of Aircraft, 1998, 35(1):53~59. [4]Fang F M, Wang D Y. On the flow around a vertical porous fence[J]. J of Wind Eng and Industrial Aero,1997, 67&68(4):415~424. [5]Subhas C, Yaragal H S,Govinda R,et al. An experimental investigation of flow fields downstream of solid and porous fences[J]. J of Wind Eng and Industrial Aero, 1997, 66(1):127~140. [6]Lee S J,Kim H B. Laboratory measurements of velocity and turbulence field behind porous fences[J]. J of Wind Eng and Industrial Aero, 1999, 80(3):311~326. -
点击查看大图
计量
- 文章访问数: 2753
- HTML全文浏览量: 186
- PDF下载量: 868
- 被引次数: 0
下载:
