运西水电站竖井贯流式水轮机性能优化

发布时间：2018-12-18 01:16

【摘要】：采用雷诺时均方程(RANS),选择S-A湍流模型,运用SIMPLEC算法,利用CFD数值模拟技术,数值模拟了不同方案的运西水电站水轮机流道内流场,分析了转轮直径、叶片翼型、叶片个数、叶片安放角、转轮轮毂、转轮转速、导叶翼型、导叶轴线与机组中心线夹角、导叶个数、叶片及导叶安装位置、导叶开度对水轮机性能的影响,叶片数为3时水轮机装置性能较优,机组最高效率点分别在转速为187.5r/min、导叶个数为15时出现。对原有流道可改变部件做适当优化后,将优化后的转轮应用于电站进行数值计算,根据全流道的数值模拟结果,预测电站改造后机组的水力性能。根据数值计算的结果制作模型水轮机和真机进行模型试验和真机测试。结果表明,数值模拟结果与模型实验以及现场运行结果曲线的变化趋势一致,数值模拟结果基本能够准确反映电站的外特性和内部流场特征。
[Abstract]:The S-A turbulence model is chosen by using the Reynolds time average equation (RANS), and the SIMPLEC algorithm is used to simulate the flow field in the turbine runner of the Yunxi Hydropower Station with different schemes by using the CFD numerical simulation technique. The diameter of the runner and the blade airfoil are analyzed. The influence of blade number, blade placement angle, wheel hub, wheel speed, guide blade airfoil, angle between guide vane axis and center line of unit, number of guide vane, installation position of blade and guide vane, and guide vane opening on the performance of hydraulic turbine. The performance of the turbine unit is better when the number of blades is 3. The maximum efficiency point of the unit is 187.5 r / min, and the number of guide vane is 15:00. After the proper optimization of the original runner can be changed, the optimized runner is applied to the numerical calculation of the power station. According to the numerical simulation results of the full channel, the hydraulic performance of the unit after the transformation of the power station is predicted. According to the results of numerical calculation, model turbine and real machine are made for model test and real machine test. The results show that the numerical simulation results are consistent with those of the model experiments and the field operation results. The numerical simulation results can reflect the external characteristics and internal flow field characteristics of the power station accurately.
【作者单位】：江苏大学流体机械工程技术研究中心;江苏省灌溉总渠管理处;
【基金】：江苏省水利厅科技项目(2014021)~~
【分类号】：TK733

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