低速风洞拐角段的流动控制减阻研究

Numerical Study of Flow Control and Drag Reduction on the Corner of Low-speed Wind Tunnel

采用k-ε湍流模型对具有不同空间布局及数量导流片的低速风洞拐角段进行了三维全流场数值分析,得到减阻抑振的导流片空间布置参数.研究表明,导流片的布局、数目、弦长对拐角段导流片压力分布、涡量分布及全流场速度分布均会产生直接影响.通过不同安装形式的拐角段导流片对比分析,8片等差间距布置各导流片均具有较均衡的低阻力系数(均在0.5左右)和低脉动升力系数(均在0.4左右),具有更好的减阻减振效果从而提高整体结构的使用寿命,并得到了更均衡的流场品质.

This paper presents a numerical study of three-dimensional（3-D）flow past the corner of the low-speed wind tunnel placing with the different arrangement and the different number of the inducers was investigated by using the k-εturbulence model.The full field vorticity and velocity distributions as well as force coefficients were calculated in detail and the flow structures were presented.The results show that the drag,the vorticity and the velocity were directly affected by different ways of arrangement and selecting the inducers.Comparing with the different configured inducers,the eight-evenlyplaced arrangement can get the more uniform drag（all of them are about 0.5）,the lower drag coefficients and the lower fluctuating lift coefficients.It indicated that the number and the shape of the inducers have important combined effects on drag reduction and vibration suppression and hence have significant effects on the flow quality of the corner of the low-speed wind tunnel.