大型立式离心泵反转全特性曲线S区研究

Research on Characteristics of Reverse S Region of Large Vertical Centrifugal Pump

随着化石燃料的快速消耗和产生的环境污染,许多公用事业已将其发电来源改为可再生能源。我国大型清洁可再生能源基地的集约化开发以及国家电网的智能化建设,需要大量的电站来进行电网调节。大型离心泵是一种用于大规模调水的通用机械,作为叶片式水力机械,它本身也具有可逆运行的能力。现有的大型离心泵机组,可实现反转发电的功能。本文以某大型立式离心泵为研究对象,在试验研究的基础上开展了水泵反转作水轮机S区数值模拟,对S区中的稳定区、近飞逸区、近零流量区以及反水泵区共四个特殊运行工况的压力、速度以及湍动能等特性进行了分析,对利用现有的水库与水力机械辅助低碳电网运行具有重要意义。

With the rapid consumption of fossil fuels and environmental pollution,many public utilities have switched their power generation sources to renewable energy.The intensive development of largescale clean renewable energy bases in China and the intelligent construction of the national power grid require a large number of power stations for grid regulation.Large centrifugal pumps are a universal machinery used for large-scale water transfer,as blade type hydraulic machinery.It also has the ability to operate reversibly.The existing large centrifugal pump units can achieve the function of reverse power generation.This article takes a large vertical centrifugal pump as the research object,and based on experimental research,carries out numerical simulation of the S zone of a water turbine with reverse pump operation.The pressure,velocity and turbulent kinetic energy characteristics of four special operating conditions in the S region,including stable zone,near runaway zone,near zero flow zone and reverse pump zone are analyzed.This is of great significance for utilizing existing reservoirs and hydraulic machinery to assist in the operation of low-carbon power grids.