Unsteady Cavitation Analysis of the Centrifugal Pump Based on Entropy Production and Pressure Fluctuation

IF 1.3 Q2 ENGINEERING, AEROSPACE

International Journal of Turbomachinery, Propulsion and Power Pub Date : 2023-11-11 DOI:10.3390/ijtpp8040046

Qiaorui Si, Fanjie Deng, Yu Lu, Minquan Liao, Shouqi Yuan

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引用次数: 0

Abstract

A numerical method using combined detached-eddy simulation (DES) and a cavitation model considering the rotation effect is used for unsteady cavitation flow field of the centrifugal pump. A closed-type pump test system was established to obtain the pump performance and pressure pulsation characteristics under different flow rates and cavitation condition, which provide boundary conditions and verification of calculations. Based on the calculation results of the unsteady flow field of the centrifugal pump cavitation, the entropy generation analysis of the flow field and an analysis of the pressure fluctuation characteristics were carried out. Then, we tried to reveal the relationship between cavitation and the deterioration of the centrifugal pump performance and the generation of the unstable operation excitation force. The internal energy loss is mainly concentrated in the impeller, volute, and pump cavity area, which accounts for more than 85% of the total entropy generation. The characteristic frequency of a Strouhal number of about 0.333 appears at the volute tongue due to the cavitation flow spread downstream.

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基于熵产和压力波动的离心泵非定常空化分析

采用结合分离涡模拟(DES)和考虑旋转效应的空化模型对离心泵非定常空化流场进行了数值模拟。建立了闭式泵试验系统，获得了不同流量和空化条件下泵的性能和压力脉动特性，为计算提供了边界条件和验证。在离心泵空化非定常流场计算结果的基础上，进行了流场熵产分析和压力脉动特性分析。然后，我们试图揭示空化与离心泵性能恶化和不稳定运行激励力的产生之间的关系。内部能量损失主要集中在叶轮、蜗壳和泵腔区域，占总熵产的85%以上。由于空化流向下游扩散，在蜗壳舌处出现了斯特劳哈尔数约0.333的特征频率。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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