安装涡发生器的矩形截面螺旋通道内流体流动

对安装三角翼型涡发生器的曲率为0.05的矩形截面螺旋通道内的流场进行了实验测量，并将测量值与模拟值进行比较，二者吻合较好。利用数值模拟方法研究了矩形截面螺旋通道内涡量的演变过程，研究了曲率及Reynolds数对涡发生器有效作用距离的影响。结果表明，安装三角翼型涡发生器后，矩形截面内靠近内壁处新出现了两个common-flow-down型的二次涡，新出现的额外涡量的极值为原有涡量的2.0~2.8倍。Reynolds数越大，曲率越小，涡发生器的有效作用距离越长。当曲率为0.05，迎流角为10°，Reynolds数为5370时，其值可达翼高的79倍。

Fluid flow in rectangular helical channels with vortex generator

The flow field of rectangular helical channel with triangle winglet pair vortex generator was measured experimentally. The curvature of the helical channel was 0.05. The experimental data are in good agreement with the calculated data. The evolution of vorticity in the helical channel and the influence of Reynolds number and the curvature on the effective influence distance of vortex generator were investigated by numerical method. The results show that, two extra vortices in common-flow-down type emerge near the inner wall in the rectangular cross section of the helical channel with triangle winglet pair vortex generator. The values of extra vorticity are 2.0-2.8 times those of the original vorticity. The effective influence distance of the vortex generator increases with the decrease of curvature and the increase of Reynolds number. It can reach 79 times of the height of the vortex generator with the curvature of 0.05, attack angle of 10° and Reynolds number of 5370.