旋流泵内部盐析颗粒流场PIV试验

为探索旋流泵内盐析颗粒的流动规律,利用PIV粒子图像速度场仪对泵内颗粒流场进行了测量,获得了颗粒准三维速度场分布,初步掌握了泵内不同工况下颗粒的流动特征.结果表明,叶轮各轴截面上速度分布差异显著,无叶腔中速度分布呈现强迫涡旋和自由涡旋的特征；流量增加,颗粒流在叶轮进口处相对速度增大,出口处相对液流角也增大,无叶腔小半径处颗粒径向速度分量随之增大；颗粒流存在纵向涡旋,涡旋中心位于叶轮流道中部,且随流量变化并不明显.

Salt-out Particle Flow Field in a Vortex Pump by PIV Measurement

In order to understand the flow pattern of salt-out particles in a vortex pump, PIV was adopted to measure the particle flow field. The quasi three dimensions velocity field of the particles was obtained. The particle flow characteristics were primarily known under several running conditions. It is indicated that velocity distributions are obviously different on various axial sections in the impeller. The forced and free vortexes were both existed in the vaneless volute. When the pump flow rate increased, particle relative flow velocity increased at the impeller inlet, as well as the relative flow angle at the impeller outlet. Near the small radius area of vaneless volute, radial velocity component increased with the flow rate changed. There is also portrait vortex of particle flow, and the vortex center is located around the centre of impeller flow passage. It is almost no change with the flow rate.