基于CFD技术—避免机组功率振荡的明渠消能坎水力设计

Based on CFD Technology—Hydraulic Design of Open Channel Energy Elimination Sill to Avoid Unit Power Oscillation

某电站采用两机共尾水明渠的形式,运行中机组间出现功率振荡,试验与历史数据分析表明该现象与尾水系统明渠水力设计有关。为有效解决其有功功率波动问题,需增大其尾水明渠流道的阻尼,拟设置消能坎。采用CFD技术进行消能坎水力设计,基于FLUENT的数值模拟计算确定了消能坎的形式与尺寸,最终将设计结果运用于工程实践,成功解决了某电站尾水系统造成的功率振荡问题,为解决此类问题提供了新的思路与方法。

A hydropower station adopts the form of two units sharing a tailwater open channel,and power oscillations occur among the units during operation.Tests and historical data analysis show that this phenomenon is related to the hydraulic design of the tailrace system open channel.In order to effectively solve the problem of active power fluctuation,it is necessary to increase the damping of the tailwater open channel runner,and it is planned to set up energy elimination sill.CFD technology is used for hydraulic design of the energy dissipation sill,and the form and size of the energy dissipation sill are determined based on the numerical simulation calculation of FLUENT.The design results are applied to engineering practice,and it successfully solves the power oscillation problem caused by the tailwater system of a certain hydropower station,and provides new ideas and methods for solving such problems.