作　　者： (）;

机构地区： School of Mechanical and Automotive Engineering, South China University of Technology, Guang- zhou, Guangdong 510640, China

出　　处： 《排灌机械工程学报》 2016年第9期737-741,共5页

摘　　要： The instantaneous variations of the hydraulic characteristics take place in centrifugal pumps during their start-up,shutdown and other variable speed operations.In this paper,the variable speed method was proposed to simulate the transient internal flow field and the external performance of the pump during starting and stopping periods.The terms of accelerations due to variable speeds in the flow governing equations were analyzed in a multiple reference of frame(MRF).A transient CFD simulation was performed for a typical centrifugal pump by using ANSYS-CFX with the standard k-εturbulence model.The entire simulation process was composed of four stages:start-up,normal run,shutdown and post-shutdown.The function of rotating speed with regard to time was set by CEL language directly into the impeller domain in the pre-processor of the software to conduct variable speed simulation.The variations of the flow field in the centrifugal pump were obtained from the transient simulation.The changing laws of flow rate,head and other performance parameters over time were also analyzed and summarized. The instantaneous variations of the hydraulic characteristics take place in centrifugal pumps during their start-up,shutdown and other variable speed operations. In this paper,the variable speed method was proposed to simulate the transient internal flow field and the external performance of the pump during starting and stopping periods. The terms of accelerations due to variable speeds in the flow governing equations were analyzed in a multiple reference of frame( MRF). A transient CFD simulation was performed for a typical centrifugal pump by using ANSYS-CFX with the standard k- ε turbulence model. The entire simulation process was composed of four stages: start-up,normal run,shutdown and post-shutdown. The function of rotating speed with regard to time was set by CEL language directly into the impeller domain in the pre-processor of the software to conduct variable speed simulation. The variations of the flow field in the centrifugal pump were obtained from the transient simulation. The changing laws of flow rate,head and other performance parameters over time were also analyzed and summarized.