Numerical simulation of two-way ultra-low head pump
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Abstract:
For a new type of bi-directional ultra-low lift pump device which can be used for two-way pumping, the CFX software was used to perform three-dimensional flow numerical simulation. The internal flow characteristics of the pump device were ana lyzed and the overall performance of the pump device was predicted. The calculation results showed that under the designed con dition (flow Q=4. 8 m3/s) and the large flow condition (flow Q=5. 4 m3/s) , the flow velocity uniformity at the impeller inlet section reached about 90%. The flow pattern at the impeller inlet section was good enough to ensure the performance of the wa ter pump. The flow line at the outlet section of the diffusion guide vane was smooth, and the recovery of the flow velocity circu lation by the diffusion guide vane was good. The hydraulic loss of the inlet water of the pump device was small, while the hy draulic loss of the outlet water was large. The device had the highest efficiency (71. 09%) under the designed working condition (flow Q=4. 8 m3/s), while the corresponding lift was 1. 345 m. The flow range in the high-efficiency zone of the pump device was relatively large,and the highest efficiency exceeded the existing low-lift pump device of the same type by more than 5%. The new type of bi-directional ultra—low lift pump device was a desirable scheme in the riverside and lakeside areas along the river where gravity drainage and the actual lift was very low.
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