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采用发展的Reynolds-Averaged Navier-Stokes方程和液相/气相界面跟踪方法的单相空化模型数值求解技术,开展了空化数对离心泵的水力性能影响特性的数值研究。在两种空化数下,数值预测的离心泵水力性能与试验数据具有很好的一致性,验证了数值预测方法的可靠性和实用性。研究了不同空化数下离心泵水力性能能头的变化规律和离心泵叶轮内附着空化空泡的形状变化特性。研究结果表明,离心泵内空化空泡尺寸随着空化数的降低而增加,离心叶轮附着空化空泡尺寸的增加降低了离心泵的能头,使得离心泵水力性能下降。
The numerical study of the influence of cavitation number on the hydraulic performance of a centrifugal pump was carried out by using the developed numerical solution of the single-phase cavitation model with the Reynolds-Averaged Navier-Stokes equation and the liquid / vapor interface tracking method. Under two kinds of cavitation numbers, the numerical prediction of centrifugal pump hydraulic performance and test data has a good consistency, validates the numerical prediction method reliability and practicability. The variation law of hydraulic performance head of centrifugal pump under different cavitation numbers and the shape change of cavitation bubble attached to impeller of centrifugal pump were studied. The results show that the size of cavitation bubbles increases with the decrease of cavitation number in centrifugal pump. The increase of cavitation bubble size decreases the head of centrifugal pump, which decreases the hydraulic performance of centrifugal pump.