立式导叶蜗壳式离心泵反转能量回收特性分析

Analysis of Reverse Energy Recovery Characteristics of Vertical Guide Vane Volute Centrifugal Pump

立式离心泵反转可作能量回收,利用水力机械的可逆性,实现电网的调节和碳排放的降低。泵工况与水轮机工况运行存在差异,是反转能量回收需要明确的一点。本文旨在模型实验的基础上,引用湍流控制方程,进行以计算流体动力学(CFD)为基础的分析,将泵工况与水轮机工况性能模拟结果、过流部件水力损失、流动能量损失评估方法进行对比,得到在不同水轮机工况与泵工况下的工作特点规律,以此来讨论立式导叶蜗壳式离心泵反转能量回收的特性,并且评估反转能量回收的可行性。结果表明,水轮机工况(反转)的高效区对应流量比泵工况略大。泵工况水力损失以叶轮出口和导叶为主,水轮机工况则以叶轮和尾水管为主。本研究可对水力机械反转能量回收技术提供进一步科学支持。

Vertical centrifugal pump inversion can be used for energy recovery,using the reversibility of hydraulic machinery to achieve power grid regulation and reduce carbon emissions.There is a difference between pump and water turbine operating conditions,which is a point that needs to be clarified for reversing energy recovery.Based on the model experiment,this paper uses the governing equation of turbulence to conduct the analysis based on computational fluid dynamics(CFD),and compares the performance simulation results of pump working conditions and water turbine working conditions,the hydraulic loss of the passing parts and the evaluation methods of flow energy loss,so as to obtain the working characteristics and rules under different turbine working conditions and pump working conditions.This paper discusses the characteristics of reverse energy recovery of vertical guide vane volute centrifugal pump and evaluates the feasibility of reverse energy recovery.The results show that the corresponding flow rate in the high efficiency zone of the turbine condition(inversion)is slightly larger than that in the pump condition.The hydraulic loss is mainly to impeller outlet and guide vane under pump condition,while impeller and tailpipe under turbine condition.This study can provide further scientific support for the energy recovery technology of hydraulic machinery reversal.