抽水蓄能电站甩负荷过渡过程下活动导叶水力特性数值模拟研究

Numerical Simulation and Hydraulic Characteristics of Moving Guide Vane in Pumped Storage Units

摘要: 为探究抽水蓄能机组在甩负荷工况下的活动导叶水力特性，对包含全过流系统的抽蓄电站稳定发电工况及甩负荷过渡过程进行了数值模拟，并对活动导叶的水力特性进行了分析研究，获得了机组在甩负荷过程中的导叶水力矩和内流特性，发现相对于机组的稳定发电工况，导叶的水力矩在甩负荷过程中存在较大的波动，当机组转速接近飞逸转速时，水力矩出现瞬时最大值，通过对比可以发现，导叶3水力矩监测相对其它导叶最大瞬时数值较大，约为80 kN•m，其余导叶瞬时水力矩最大值均在70 kN•m左右，转轮内部的涡核旋转失速和叶片出水边出现的脱流现象是造成这种力矩波动的主要原因。

Abstract: To explore the activities of the pumped storage units in load rejection condition guide vane hy-draulic characteristics, containing the full flow system of stable power generation pump storage power station operating mode and the load rejection transient numerical simulation of the guide vane and the activities, this paper analyzes the hydraulic characteristics of the unit in the process of load rejection guide vane water moment and internal flow characteristics, finding that relative to the working condition of the stability of the power unit, the water of the guide blade moment in the larger fluctuations in load rejection process, when the unit speed is close to runaway speed and the maximum water appears instantaneous torque, can be found by comparison, and guide vane 3 water monitoring torque relative to other guide vane maximum instantaneous value is bigger. It is about 80 kN•m, and the maximum value of water moment of the other instantaneous blade is about 70 kN•m. The vortex core in the inner rotor and the out-of-water edge of the blade are the main reasons for this torque fluctuation.