低雷诺数涡轮内部流场分析  

Analysis of turbine flow field under low Reynolds number condition

作　　者：杨琳[1] 冯涛[1] 邹正平[1] 李维 

机构地区：[1]北京航空航天大学能源与动力工程学院,北京100083 [2]株洲航空动力研究所,株洲412002

出　　处：《北京航空航天大学学报》2005年第11期1194-1197,共4页Journal of Beijing University of Aeronautics and Astronautics

基　　金：国家自然科学基金资助项目(50206001);航空基础科学基金资助项目(03C51030)

摘　　要：利用三维数值模拟手段研究涡轮内部流动.对比分析了不同飞行高度工作时涡轮内部流场结构的差异,以反映雷诺数的降低对流动结构和性能的影响.结果表明:在高空工作环境下,雷诺数下降近一个量级,负荷分布发生变化,叶片吸力面发生大范围分离,二次流以及径向掺混明显增强,由此导致涡轮性能恶化,效率急剧下降,这些因素在低雷诺数涡轮气动设计中需给予更多的关注.同时指出,负荷分布形式的选择对低雷诺数涡轮设计有重要意义.The flow field in turbine was investigated using three-dimensional numerical simulation method. The flow structures in different altitude were compared and analyzed, to show the effect on flow structure and turbine performance with the decrease of Reynolds number. The results indicate that on the condition of high altitude, the Reynolds number is decreased nearly one order, and the blade loading distribution is changed, large separation is found on blade suction surface, and secondary flow and radial mixing effects enhance obviously, so that the performance is changed worse and the efficiency is dropped rapidly. These factors should be paid more attention to the aerodynamic design of turbine under low Reynolds number condition. Moreover the selection of loading distribution form is also an important factor of the design.

关 键 词：低雷诺数 涡轮 分离 二次流 数值模拟 

分 类 号：V231.3[航空宇航科学与技术—航空宇航推进理论与工程]