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混流式水輪機轉輪優(yōu)化設計的空化流計
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Simulation of Francis Turbine Runner for Hydraulic Optimization Design
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    摘要:

    采用求解時均N-S方程，結合氣液質量輸運方程的兩相流方法，在水輪機優(yōu)化設計中進行轉輪的空化流場分析。結果顯示：在高水頭下適當增加葉片包角，延長出水邊，數(shù)值計算效率為94.7%，明顯高于改型前的93.4%；葉片壓力分布更為均勻，最優(yōu)工況點的臨界空化系數(shù)也低于改型前的0.03, 空穴區(qū)域減小，轉輪的空化性能得到改善。計算結果與實驗結果相符，為轉輪的再優(yōu)化設計提供了參考依據(jù)。

    Abstract:

    The simulation of cavitating flows in hydraulic runner for the hydraulic optimal design was presented by using the two-phase flow method through the solution of the time-average Navier-Stokes equations based on the mass transport equation. The results show that the efficiency apparently increases from 93.4% to 94.7% when the wrap angle of the blade enlarges and the trailing edges of the blade extend. The pressure on the blades is well distributed and the critical cavitation coefficient at optimum operating condition is lower than unmodified, 0.03, and the cavity domain are also decreased. Finally, the cavitation performance of runner is improved. The computational results, which agree with experimental data, provide a correct direction for further optimal design for the runner.

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王磊,常近時.混流式水輪機轉輪優(yōu)化設計的空化流計[J].農(nóng)業(yè)機械學報,2009,40(9):98-102. Simulation of Francis Turbine Runner for Hydraulic Optimization Design[J]. Transactions of the Chinese Society for Agricultural Machinery,2009,40(9):98-102.

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