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首页> 外文期刊>Computers & Fluids >Application of the two-phase three-component computational model to predict cavitating flow in a centrifugal pump and its validation
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Application of the two-phase three-component computational model to predict cavitating flow in a centrifugal pump and its validation

机译：两相三成分计算模型在离心泵空化流量预测中的应用及验证

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摘要

To improve the numerical simulation accuracy of predicting the cavitating flow in centrifugal pumps, a new developed cavitating flow computational model, named two-phase three-component computational model, is proposed. To evaluate its performance, the comparisons are carried out among CFX default cavitating flow computational model, the optimal computational model and the proposed model, concerning a centrifugal pump. Meanwhile, the experiments are conducted to validate the calculations, including pump head drop test and cavitating flow visualization at the pump inlet. The results show that the two-phase three-component computational model has better performance both on predicting pump head drop and bubble structure. It is observed in the current work that the sheet cavity firstly occurs on the leading edge of the suction side of the impeller. With the cavitation number decreasing, the cavity length grows rapidly along the suction side towards impeller outlet. Simultaneously, the cavity starts to extend to the pressure side. Based on the analysis of the blade pressure load on the blade surface and total pressure coefficient distribution in the channel, it is found that the cavitation has great effect on blade pressure load. Besides, the total pressure coefficient drops mainly take place on the upstream, that is to say, the growth of cavitation affects downstream rarely. (C) 2016 Elsevier Ltd. All rights reserved.
机译：为了提高预测离心泵中空化流的数值模拟精度，提出了一种新的发展的空化流计算模型，称为两相三分量计算模型。为了评估其性能，在涉及离心泵的CFX默认空化流计算模型，最佳计算模型和提出的模型之间进行了比较。同时，进行了实验以验证计算结果，包括泵压头下降试验和泵入口处的空化流可视化。结果表明，两相三分量计算模型在预测泵压降和气泡结构方面都有较好的表现。在当前工作中观察到，片腔首先出现在叶轮的吸入侧的前缘上。随着空化次数的减少，空腔长度沿吸力侧向叶轮出口迅速增长。同时，空腔开始向压力侧延伸。通过对叶片表面的叶片压力载荷和通道内总压力系数分布的分析，发现空化对叶片压力载荷有很大的影响。此外，总压力系数的下降主要发生在上游，也就是说，空化的增长很少影响下游。 （C）2016 Elsevier Ltd.保留所有权利。

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