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| Impeller design criterion based on numerical simulation of stock pump flow field and its application |
| 1.Institute of Fluid Engineering, Zhejiang University, Hangzhou, Zhejiang 310027, China; 2.Hangzhou Zhenxing Limited Company of Industrial Pump, Hangzhou, Zhejiang 311234, China; 3.College of Metrology and Measurement Engineering, China Jiliang University, Hangzhou, Zhejiang 310018, China) |
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Abstract The model of fiberflow coupling and the solving procedures are presented. The method is applied to the numerical simulation of the fiber suspension through the stock pump impeller. The results show that, the fiber orientations change drastically in the vicinity of the inlet; near the concave wall region the orientations flip obviously; and along the midstreamline and the streamline close to the convex wall, the orientations become more stable. The extra stress is significant along the concave wall close to the inlet, and it becomes uniform in the middle region and the downstream region. The results are further extended to the design of the stock pump impeller. Four design criterions are obtained as follows: the large radius of curvature on the first one third part of the blade, the channel expansion angle criterion, the large wrap angle criterion, and the blade outlet angle criterion. These criterions are added into the existing optimization system based on hydraulic design criterions. A stock pump impeller design system is developed. Then a new stock pump impeller is designed and the tested pump efficiency is 6％ more than the original machine, and is 3％ more than the Chinese stock pump standard.
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2011, Vol. 32 
