CFD application in optimization improvement design of a low specific speed centrifugal pump impeller

There are some problems of hydraulic performance in the low specific speed centrifugal pump, such as small capacity, low efficiency. In this paper, the long-short blade method and enlarging flow method is applied to optimize the impeller. In design of impeller optimizing, author uses CFD technology to predict model performance, analyzes the test results, finally gets the best parameters combination of the impeller. Testing result for the prototype of product proves that the optimized impeller model has a good hydraulic performance, indicating that CFD will help designer optimize centrifugal pumps.