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为提高水泵水轮机综合效率,提出一种长短叶片型转轮以改善机组运行在发电与抽水两工况下内流特性。以可逆式水泵水轮机作为研究对象,将长短叶片数目与骨线出口边直径比例作为优化目标切入点,借用软件SolidWorks建立不同的水泵水轮机三维模型,并通过CFD数值模拟手段验证优化思路。ICEM软件用于划分各过流域网格,分离涡湍流模型(DES)用于求解内流场,重点研究水轮机工况与水泵工况下可逆机组内流场特性并量化运行参数。研究结果表明:长短叶片转轮相对全长叶片转轮在抗空化性能方面表现出较好的优良性,具体体现在叶片宽口边有回压。6长6短、7长7短、8长8短叶片转轮在水轮机工况下效率分别提高了3.463%、3.198%和1.119%;水泵工况下6长6短和8长8短叶片转轮效率均降低约4个百分点,而7长7短叶片转轮效率提升约4个百分点。此外,长叶片骨线出口边直径与短叶片骨线出口边直径最优比例为2/3。研究成果可为新一代水力机械的设计提供一定的参考。
Abstract：In order to enhance the comprehensive efficiency of pump-turbine, a kind of runner with long and short blades is proposed herein, so as to improve the internal flow characteristics of the pump-turbine unit under both the operation conditions of power generating mode and pumping mode. By taking reversible pump-turbine as the study object, and the ratio of the number of long and short blades to the diameter of the exit edge of the runner blade profile center line as the breakthrough point of the optimization objective, different 3-D models of pump-turbine are established with the software—SolidWorks, and then the optimized content is verified through CFD numerical simulation. The internal flow characteristics of reversible pump-turbine unit under both the operation conditions of the turbine mode and pump mode are emphatically studied, and the relevant operation parameters are quantitized by means of applying the software—ICEM to the division of the grids of all the flow-passing regions. Detached eddy simulation(DES) is used to solve the internal flow field. The study result shows that the runner with long and short blades exhibits a better performance in the aspect of cavitation erosion resistance with the specific embodiment that back pressure is there at the wide edge of the blade. Under the operating condition of turbine mode, the efficiencies of the runners with six long and six short blades, seven long and seven short blades and eight long and eight short blades are increased by 3.463%, 3.198% and 1.119% respectively, while both the efficiencies of the runners with six long and six short blades, eight long and eight short blades are decreased by about 4%, but the efficiency of the runner with seven long and seven short blades is increased by about 4% under the operation condition of pump mode. Additionally, the optimal ratio of the diameter of the exit edge of the profile center line of long blade to the diameter of the exit edge of the profile center line of short blade is 2/3. The study result can provide a certain reference to the design of the new generation of hydraulic machinery.
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基本信息:
DOI：10.13928/j.cnki.wrahe.2021.04.012
中图分类号:TV734.1
引用信息:
[1]宋晓峰,毛秀丽,陆家豪,等.基于CFD的长短叶片型水泵水轮机转轮优化设计[J],2021,52(04):115-123.DOI:10.13928/j.cnki.wrahe.2021.04.012.
基金信息:
国家自然科学基金项目(51909222);; 国家“十三五”重点研发计划项目(2016YFC0401808);; 陕西省水利科技计划项目(2016slkj-4);; 西北农林科技大学科研启动基金(Z109021813)