Study on Effects of Blade Number on Stall Characteristics for Centrifugal Pump Impeller

doi:10.3901/JME.2016.10.207

Abstract

Abstract: In order to investigate the effects of blade number on stall characteristics for a centrifugal pump impeller, a developed Sub-grid scale model is applied to a centrifugal pump impeller with different blade number. The motion rule and characteristic parameters of stall cells are obtained, including the number, stall frequency and rotation speed. The results show that the blade number has significant effects on stall types. As the blade number is even, the alternative stall phenomenon occurs. Otherwise, when it is odd, the rotating stall phenomenon appears. Furthermore, the blade number also has influence on the characteristic parameters of stall cells. Under the alternative stall condition, as the increase of blade number, the number of stall cells increases, while the stall frequency decreases. The stall frequency of 4 blades is 2.4 times as large as that of 6 blades. Under the rotating stall condition, with the increase of blade number, the number of stall cells also increased. The speed of stall cells of the impeller with 7 blades is 1.8 times as fast as that with 5 blades. The stall frequency of 7 blades is 3.8 times as large as that with 5 blades.

Key words: alternative stall, blade number, centrifugal pump, rotating stall

CLC Number:

TH311

ZHOU Peijian, WANG Fujun, YAO Zhifeng. Study on Effects of Blade Number on Stall Characteristics for Centrifugal Pump Impeller[J]. Journal of Mechanical Engineering, 2016, 52(10): 207-212.

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