This paper investigates the energy dissipation mechanism of the internal flow field of the full tubular pump during reverse power generation and pump conditions, utilizing CFD and model test methods to research the device’s hydraulic characteristics, internal flow field and entropy production. The results indicate that the reverse power generation and pump conditions’ performance curves have opposite trends. Under PRPG conditions, the flow uniformity and weighted average angle of the impeller inlet flow field are smaller and the inlet flow field is poor. The stator-rotor gap flow under PRPG conditions increases with the increase in total flow, the gap flow under the design flow is 2.88 L/s, and the torque is 7.35 N·m. Under the PRPG condition, the turbulent and wall entropy production ratio increases gradually with the flow increase. Under the design flow rate, the entropy production rate of the impeller is 55.07%, and the entropy production rate of the impeller is the largest among the components under different flow rates. The entropy production of the outlet channel rises significantly with the flow rate. The research results of this paper provide a theoretical basis for the distribution of energy loss in reverse power generation of the full tubular pump.

中文翻译：

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利用熵产理论研究全贯流泵逆发电条件下的能量损失机理

本文研究了全贯流泵在反向发电和泵工况下内部流场的耗能机理，利用CFD和模型试验方法研究了装置的水力特性、内部流场和熵产生。结果表明，反向发电量与泵工况性能曲线具有相反的趋势。PRPG工况下，叶轮入口流场流动均匀度和加权平均角较小，入口流场较差。PRPG工况下的定转子间隙流量随着总流量的增加而增大，设计流量下的间隙流量为2.88 L/s，扭矩为7.35 N·m。在PRPG条件下，随着流量的增加，湍流与壁面熵产比逐渐增大。在设计流量下，叶轮的熵产率为55.07%，叶轮在不同流量下的部件中熵产率最大。出口通道的熵产随着流速的增加而显着增加。本文的研究成果为全贯流泵反向发电能量损失的分布提供了理论依据。