The effect of impeller cut on the performance of middle specific speed centrifugal pump

摘要

For researching the influence of impeller cut ways and methods on the external characteristics of centrifugal pump,the flow m IS125-100-216 pump was simulated by using FLUENT software after impeller cut,and the external characteristics were also predicted.The predicted external characteristics show that the head reducing value after cutting impeller is significantly greater than that after cuttmg blade in the same cut value.When the cut angle is in the range of 0° to 10°,the efficiency in the forward skew cut is higher than that in the straight cut and the backward skew cut.The shaft power in the impeller cut is obviously lower than that in blade cut.When the cut angle is in the range of-10° to 10°,the shaft power in the skew cut is lower than that in the straight cut.The results of the inner flow analysis indicate that in the same cut value the forward skew cut significantly weakens the vortex phenomenon in the straight cut with the increase of the cut angle.No matter the straight cut or the skew cut is conducted,the effect of blade cut is better than that of impeller cut in the same cut value.