|
|
|
| Experiment investigation into measures for eliminating hump in head curve of IS type centrifugal pumps |
| CHEN Yan, WANG Tianzhou, BAI Xiaobang, LUO Shaohua, ZHANG Yongxiang |
| National Enterprise Technology Center, Chongqing Pump Industry Co. Ltd., Chongqing 400033, China |
|
|
|
|
Abstract Experiments showed that there was a hump in the head curve of a single-stage end-suction centrifugal pump. To eliminate the hump and improve the stability of the curve, three measures were taken:(1)reducing impeller inlet diameter and blade outlet width,(2)installing two baffles arranged symmetrically in the suction nozzle, and(3)adding one baffle in the nozzle only. The tested results showed that measure(1)made the shape of the head curve almost unchanged, thus the hump was still present, just as a whole the head suffered from a certain amount of reduction. This suggests measure(1)generates no obviously positive effect on the hump elimination. After measure(2)or(3)was taken, the hump in the head curve almost disappeared, but also the losses in the head and efficiency were minor. The effect of these two measures on eliminating the hump was significant. To validate measure(3)further, the performance curves of another single-stage end-suction centrifugal pump with and without a baffle were tested. The tested data revealed that the added baffle resulted in the hump eliminated basically with a slight loss in the pump performance only, and the effectiveness of the treatment has been confirmed.
|
|
Received: 11 June 2018
|
|
|
|
|
|
|
