肋板绕流场可视化测试与数值研究

Visualized test and numerical investigation on flow around ribs

用粒子图像测速仪(PIV)设备对不同高度下肋板的非定常绕流场进行了全场测试,揭示了肋板尾流场旋涡随时间推进所经历的非线性演化过程.同时将瞬时流谱与不同时间间隔下的时均流谱及流场数值计算结果相比较,分析了它们之间的差别.并且通过对不同肋板高度的时均流场的分析,得出了其尾旋涡尺度与肋板高度之间的非线性变化规律.

By taking advantage of PIV (Particle Image Velocimetry) technique,the unsteady flow fields around different ribs are captured,which reveals the nonlinear evolution processes of vortices.The instantanuous and time-averaged stream patterns in different time intervals are compared and their differences are analyzed.The results of the PIV test also indicate the nonlinear relationship exists between the vortex scale and the rib height.