Improvement of Investigation technique of Tornado-like Swirling Upwind by Experiment and CFD

为研究不同进口气流条件对类龙卷风旋转逆风特性的影响，研制了多风机多叶片类龙卷风流动模拟装置。另一方面，开发了可以再现龙卷风流模拟器中的流的CFD技术。计算流体力学分析的结果表明，叶片周围的流动是分离的，流动控制是不完全的。这一结果明确了模拟器的改进方向。

Tornado-like flow simulator with multi-fan and multi-vane was developed to investigate effects of inlet flow condition on characteristics of tornado-like swirling upwind by PIV method. On the other hand, CFD technique, which can reproduce the flow in the tornado-like flow simulator, was developed. The results of this CFD analysis indicated that the flow around vanes is separating and the control of flow is incomplete. The improvement direction of the simulator was clarified by this result.