喷射方法对尾流旋涡脱落的抑制

采用数值模拟的方法研究了尾部喷射对波动来流绕圆柱流动旋涡脱落的抑制,进而研究圆柱尾流控制机理.研究流场的无量纲波频范围为0².8,来流波动的无量纲幅值为0.2,雷诺数=200.在圆柱尾部沿圆柱母线开宽度为0.04倍柱体直径的缝隙,从缝隙中射出流体对尾流进行抑制,寻找可有效抑制旋涡脱落的喷射速度范围,进而求出雷诺数=200,无量纲振幅为0.2时有效抑制范围.当喷射速度在一定范围内时,可有效抑制旋涡脱落,并且随着无量纲频率的增大,有效抑制范围逐步减小.

Suppression of vortex shedding behind a cylinder by base blowing

The numerical simulation method was applied to study the suppression of vortex shedding in wave current past a cylinder by using base blowing and the wake flow control mechanism. The dimensionless wave frequency was from 0 to 2.8 and the fluctuation amplitude was 0.2 while Reynolds number was 200. The base blowing of 0.04 times the diameter of the cylinder was injected from the slit which was along the bus line of the cylinder to obtain the range of speed of blowing . We could get the range when the Reynolds number was 200 and the fluctuation amplitude was 0.2. Research shows that vortex shedding can be effectively suppressed in a certain range of the blowing speed, and the range will be smaller when the fluctuation amplitude increases.