抽水蓄能电站引水岔管水力特性数值模拟

通过对某抽水蓄能电站在不同工况（抽水或发电）、不同分流比（单台机或多台机运行）情况下引水岔管的水力特性进行三维数值模拟计算，采用非结构化网格离散计算区域，使用有限体积法将方程的积分形式转化为代数方程组，为保证计算精度，采用二阶迎风格式，隐式求解，速度和压力方程用SIMPLE算法耦合．分析了各工况下岔管处水头损失变化和水流流态情况．结果表明，计算结果与试验较吻合，由于夹带不同能量水流汇合后“能量相互传递”，抽水工况水头损失出现了负值，发电工况流态好于抽水工况流态；分流（发电）水头损失较大，合流（抽水）水头损失较小，为机组运行方式的选择提供了依据，可使岔管能量损失降低到最小程度．

Numerical simulation on hydraulic characteristics in water diversion bifurcated pipes of pumped storage power station

The hydraulic characteristics in water diversion bifurcated pipes in pumped storage plant were calculated by 3 -D numerical simulation under different operation conditions （pumping or generating）and different flow ratio （single machine operation or many）. Unstructured grid was used to discretize the model, finite volume method was used to divert equation＇s integral pattern into algebra equations, second order upwind scheme was used and calculated by implicit method to ensure precision, and SIMPLE meth- od was adopted to couple pressure and velocity. Water head loss and the flow pattern were analyzed under various conditions in bifurcated pipes. It is shown that the computation results are consistent with the experimental data. Because the energy transfers after converging current from different energy, water head loss in pumping is minus, the flow pattern in generating is better than that in pumping; and water head loss is larger in generating and smaller in pumping. The results provide the basis for turbine＇s running mode, and minimize the energy loss to the least.