Prediction of cavitation performance of axial—flow pump based on CFD
Yang Zhengjunl,Wang Fujunl,Liu Zhuqing1,Zhang Zhimin2
(1.College of Conservancy and Civil Engineering,China Ashcultural University,Beijing 100083,China;2.China Institute ofWater
Resources and Hydropower Research,Beijing 100038,China)
Abstract:Abstract:The flow field in an axial-flow pump at different inlet pressure conditions including cavitating and non-cavitating conditions was simulated by using the computational fluid dynamics(CFD)approach based on theory of bubble dynamics and steam-liquid two-phase flow.The velocity field and pressure
distribution were analysed during cavitation progress and the pump characteristics were predicted.The results show that under the non—cavitating condition,the pump head-flow relationship is well predicted with an inaccuracy within 2%.While under the cavitating condition。the cavitation occurring and develo-ping processes are captured successfully by CFD simulation.The cavitation directly affects the pressure distribution on impeller blade surfaces,and also results in change of the pump head and power eharacteristics.Under the cavitation condition,the cavitation area can be found at the leading edge of the guidevane suction sides.Similarity of the cavitation distribution are found among the different impeller passages.But significant differences of the cavitation distribution are revealed among the different guide vanepassages.which is one of the primary factors that result in unstable operation of an axial-flow pump.
杨正军,王福军,刘竹青,张志民 . 基于CFD的轴流泵空化特性预测[J]. 排灌机械工程学报, 2011, 29(1): 11-15.
Yang Zhengjun,Wang Fujun,Liu Zhuqing,Zhang Zhimin . Prediction of cavitation performance of axial—flow pump based on CFD. Journal of Drainage and Irrigation Machinery Engin, 2011, 29(1): 11-15.
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