|
|
Influence of liquid viscosity on internal flow structure in vortex pumps |
QUAN Hui1* ,YU Xinyang1 ,LI Yanan1,SONG Kai1,PU Haiyan2,WANG Weihua2 |
1. College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China; 2. Jiangsu Shuangda Pump Industry Co., Ltd., Jingjiang, Jiangsu 225300, China |
|
|
Abstract Taking 150WX-200-20 vortex pump as the research object, the change of pressure gradient and velocity gradient of the circulating and through flow in the vortex pump when transporting chemical waste liquid was analyzed, and the influence of viscosity on its internal flow structure was explored. The research results show that as the viscosity increases, the head of the vortex pump decreases, the shaft power increases, and the efficiency decreases. At the same time, the internal flow structure also changes. The circulating flow is compressed in the axial direction. A large amount of fluid accumulates in the retracting cavity, which reduces the efficiency of the swirl pump. The circulation flow and through flow in the vortex pump are quantified, and the best efficiency point in terms of pressure gradient and velocity gradient is analyzed. The change of viscosity changes the direction of the through flow velocity gradient, from first increase and then decrease to first decrease and then increase. For the circulating flow, the greater the difference between the maximum velocity gradient and the minimum velocity gradient when the viscosity is not higher than 0.10 Pa·s, the higher the efficiency, and when the viscosity is higher than 0.10 Pa·s, the smaller the difference, the higher the efficiency. This conclusion has important reference value and guiding significance for the application of rotary pump in the chemical field.
|
Received: 24 September 2021
|
|
|
|
|
|
|