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Optimization method for offset splitting blades based on advanced control flow theory |
Jia Ruixuan, Xu Hong |
(Key Laboratory of Condition Monitoring and Control for Power Plant Equipment(North China Electric Power University), Ministry of Education, Beijing 102206, China) |
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Abstract To overcome the shortcomings of fully depending on experience in the past while choosing the offset position and offset angle of splitting blades in centrifugal pump compound impellers, the advanced controlflow theory was used to optimize splitting blades design. First of all, on the basis of the fluid element stress conditions in flow passage of centrifugal backward sweep impellers, the equilibrium of force perpendicular to the streamline was established. Subsequently, along normal orientation to the streamline, the relevant formula between pressure gradient and relative velocity gradient was deduced from relatively movement Bernoulli equation. Furthermore, the relation between pressure gradient normal to the streamline and geometry structure was obtained. Then the prime offset location was identified by analyzing several correlative formulas. At the same time, splitting blade inlet was offsetted moderately to suction side to realize the after loading characteristic. The test results show that the analysis conclusions match the experimental data very well and are proved to be reasonable.
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Received: 31 December 2009
Published: 30 September 2010
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