封闭缸体内旋转圆盘流动的PIV测试研究

PIV measurement on rotating disks flow in cylinder

本文使用PIV(Particle Image Velocimetry)测试方法对封闭缸体内的旋转圆盘间流动进行了测量与分析。旋转盘间流场轴向间隙和转速可调,隙径比G的范围在0.0375至0.3750之间,旋转雷诺数ReR范围在1.6×105至1.0×106之间。实验得到了盘间各轴向截面上的平均流动信息。对比M.Itoh等人(1992)使用热线测量的数据(G=0.08,ReR=1.0×106),核心区内平均周向速度分布规律吻合,但在小半径和大半径处有一定差别。通过讨论了核心区内部周向速度分别与r、ReR、G的关系,得到了封闭缸体内旋转圆盘流动K值和近壁面剪切层厚度的变化规律。

The flow field in an enclosed cylinder with a rotating disk was measured by P1V （Particle Image Velocimetry） method. A flexible test rig, in which the gap was variable, was set up. The gap ratio G, characterizing the rotor-stator cylinder, should be varied from 0.0375 to 0.3750. The rotational Reynolds numbers ReR is from 1.6×10^5 to 1.0×10^6. The mean flow information of the cross section was obtained, and the velocity profiles in the core and its surrounding flow field are in good agreement with the experimental data （G=-0.08, Ren=1.0×10^6） by means of hot-wire measurement in literature [Itoh M, Yamada Y, Imao S ＆ Gonda M. 1992 Experiments on turbulent flow due to an enclosed rotating disk. Experimental Thermal and Fluid Science vol. 5, pp. 359-368.], though differences exist in large and small radii locations. Through discussing the relationships between the core flow circumferential velocity and r, ReR, G, respectively, the variation law of the value of K and the thickness of the near wall shear layer in the rotating flow enclosed by a cylinder was obtained.