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| 3-D turbulent calculation of hydraulic moment of axial-flow pump blades |
| DENG Dong-sheng1, MA Zhi-hua2, ZHU Hong-geng3 |
| 1.Jiangsu Water Supply Co., Ltd.for S-to-N Water Diversion Project, Nanjing, Jiangsu 210029, China; 2.Water Conservancy Engineering Beureau of Jiangsu Province, Nanjing, Jiangsu 210029, China; 3.College of Hydraulic Science and Engineering, Yangzhou University, Yangzhou, Jiangsu 225009, China |
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Abstract The Reynolds time-averaged Navier-Stokes equations with RNG turbulent model were studied to simulate the three-dimensional internal flow of an axial-flow pump.By calculating the flow rate,head,power and efficiency of the pump,the computed performance characteristics of the pump were compared with those from physical model test results.The former corresponds well with the latter,so the validity and effectiveness of the numerical model were verified. The method of calculating hydraulic moment on blades was discussed.The hydraulic moments under different conditions were calculated based on the computed results,and the changing features of hydraulic moment on blades with flow rates and pump head were analyzed in detail.There exists a saddle type zone in the hydraulic moment curve of axial-flow pump blades which corresponds to the saddle zone of discharge-head characteristic curve of the pump.In the small flow-rate zone,the moment goes up abruptly with the decrease of flow rate.The change of hydraulic moment on blades is closely related with pump characteristics,which should arouse the attention of pump designers.
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Received: 08 August 2013
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