Study on flow field and remote suction performance of tornado generator with cap-shaped rotating disk

Abstract

Flow visualization experiments with smoke and particle image velocimetry are conducted to investigate the characteristics of tornado-like swirling flow generated by a tornado-type remote suction device. The experimental parameters controlled in this flow are configuration of the rotating disk and rotation number. The results obtained are as follows. Swirling flow with cap-shaped rotating disk is stronger than that with flat rotating disk. In addition, outer fins attached on cap-shaped rotating disk strengthen the flow generated by rotating disk. The larger the degree from horizontal plane of cap-shaped rotating disk is, the stronger the swirling flow generated by the disk becomes. Proper balance of upflow and swirling flow is required to generate stable tornado-like swirling flow. Under the condition of tornado generation, the tangential velocity component of tornado becomes larger for smaller disk angle from horizontal plane.