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采用数值计算方法研究轴流式水轮机的能量特性。计算模型建立在雷诺平均的Navier-Stokes方程的基础上 ,采用k -ε紊流模型 ,对水轮机流道内部流动进行三维紊流计算。计算不同的工况下机组的特性 ,绘制转轮在不同桨叶角度下的定桨特性曲线 ,在此基础上得出转轮的协联曲线及综合运转特性曲线 ,从而对机组的能量性能作出合理的判断。轴流转桨式水轮机运行效率较高的关键在于 ,其活动导叶和转轮桨叶之间具有最佳可调性能的协联关系。目前对协联线的绘制有包络线法和最高效率点法 ,采用何种方法值得进一步研究 ,针对具体电站机组 ,应该在最优效率区并偏重安全运行特性来绘制
Numerical Calculation of Axial Flow Turbine Energy Characteristics. The calculation model is based on the Reynolds-averaged Navier-Stokes equations and the k-ε turbulence model is used to calculate the three-dimensional turbulent flow in the flow field of the turbine. Calculate the characteristics of the unit under different operating conditions, draw the rotor at different blade angle of the paddle under the characteristic curve, and then come to the runner’s synergic curve and the integrated operating characteristics of the energy performance of the unit Reasonable judgment. The key to the high operating efficiency of the Kaplan turbine is that it has the best adjustable coupling relationship between the moving vane and the rotor blade. At present, the enveloping line method and the highest efficiency point method are drawn for the concatenation lines. Which method is used is worth further study. For the specific power station units, the optimal efficiency area should be emphasized with emphasis on the safe operation characteristics