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为全面了解进口安放角对离心泵性能的影响,在型号为DFG150-9离心泵叶轮水力模型基础上添加正负冲角,获得6组叶片模型,利用RNGκ-ε模型考虑湍流影响,采用均质多相模型和Rayleigh-Plesset方程考虑空泡生长和溃灭,对6组模型进行三维定常湍流数值模拟,并对效率、扬程和空化余量等进行预测和对比分析。结果表明,添加负冲角,泵效率下降很多,效率曲线向小流量方向偏移,且加速泵抗空化性能恶化;添加0°～15°冲角,所加正冲角越大,小流量区效率越低,大流量区效率越高,且效率曲线向大流量方向偏移,对泵空化性能影响不明显;当正冲角添加至20°时,泵抗空化性能急剧下降,泵效率下降很多。
In order to fully understand the influence of inlet angle on centrifugal pump performance, positive and negative angles of attack were added on the basis of model DFG150-9 centrifugal pump impeller hydraulic model, and 6 groups of blade models were obtained. Taking RNG κ-ε model into consideration, The multiphase model and the Rayleigh-Plesset equation consider the growth and collapse of cavitation bubble. The six groups of models are numerically simulated by three-dimensional steady turbulence. The efficiency, lift and cavitation margin are predicted and compared. The results show that adding negative angle decreases the efficiency of the pump, the efficiency curve shifts to the low flow rate, and the anti-cavitation performance of the acceleration pump deteriorates. When the angle of attack is 0 ° ~ 15 °, the larger the positive angle of attack, The lower the district efficiency, the higher the efficiency of the large flow area and the shift of the efficiency curve to the large flow direction, which has no obvious effect on the cavitation performance of the pump. When the positive angle of attack is added to 20 °, the anti-cavitation performance of the pump drops sharply. The efficiency drops a lot.