具有强迫过流旋转圆盘系统流动实验研究

EXPERIMENTAL INVESTIGATION ON FLOW IN GAP BETWEEN A ROTATING AND A STATIONARY DISK WITH FORCED THROUGH FLOW

应用PIV技术,实验研究了具有大的径向过流的动静圆盘系统间隙内流动。实验在流量系数Cw=26705和间隙比G=0．0845下,实验获得了在不同雷诺数和过流方向时的涡量、湍流强度、雷诺应力和速度分布。实验表明过流方向是流场结构变化的主要因素。同时,实验发现了一个重要的物理现象,即具有强迫过流的动静圆盘系统的流场分布,是由无过流时的动静圆盘系统流场和具有强迫过流双静止圆盘系统流场的叠加而形成。

A Particle Image Velocimetry （PIV） is applied to measure turbulent flows in the whole gap between a rotating and a stationary disk with different Ren for flow coefficient Cw = 26705 and gap ratio G=0.0845 when the direction of through flow in the gap are both inward and outward. Distribution of velocity, vortices, turbulent intensity and Reynolds shear stress in the gap are obtained. Experiment shows that the direction of the forced through flow is the main influence factor of the flow structure. The important physics phenomena is found that the flow field with force through in rotating disk system is composed of flow fields with no through flow in the gap between rotating disk and a stationary disk and through flow in the gap between two stationary disk.