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| 边界层特性对雷诺数变化的敏感性分析 |
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冯涛1,2, 程洪贵1,2, 杨琳1,2, 邹正平1,2, 李维3,4
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1.北京航空航天大学航空发动机气动热力重点实验室;2.北京100083;3.中国航空动力机械研究所;4.湖南株洲412002
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| 摘要: |
| 通过对有压力梯度下的边界层进行研究,模拟低压涡轮叶片表面边界层的发展过程,并分析了叶片表面不同负荷分布形式情况下吸力面边界层特性对雷诺数的敏感程度。计算中,分别采用了三种典型的涡轮气动负荷分布形式:后加载、前加载、均匀加载等,并分别模拟了三种不同的雷诺数下的边界层发展情况。结果表明:在同一雷诺数情况下,不同负荷分布形式吸力面边界层发展呈现出明显差异;而不同负荷分布形式下叶片表面边界层特性对雷诺数的敏感程度也不一样,相对而言,均匀加载形式对雷诺数的敏感程度最小,更适应低雷诺数条件下工作。 |
| 关键词: 低压涡轮+ 负荷分布+ 雷诺数 边界层 |
| DOI： |
| 分类号:V231 |
| 基金项目:航空基础学科基金(03C51030);国防基础科研项目(K1204060722);国防科技重点实验室基金项目(51459060104HK3802)。 |
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| Receptivity of boundary layer to Reynolds number |
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FENG Tao,CHENG Hong-gui,YANG Lin,ZOU Zheng-ping,LI Wei
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1.National Key Laboratory of Aircraft Engine , Beijing Univ. of Aeronautics and Astronautics, Beijing 100083, China;2.Chinese Aviation Powerplant Research Inst.,Zhuzhou 412002, China
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| Abstract: |
| Boundary layers with different pressure gradient were investigated to simulate blade boundary layer development of low pressure turbine. The receptivity of suction side boundary layer to Reynolds number at different loading distributions was also analyzed. Three typical loading distributions of turbine blades: aft-loading, fore-loading and uniform loading were used in the simulation with three different Reynolds numbers. Numerical results indicate that, the developments of suction side boundary layer of three loading distributions have evident differences at the same Reynolds number. The receptivity of blade boundary layer to Reynolds number is different for different loading distributions. Uniform loading has the lowest receptivity to Reynolds number, which is suitable to the low Reynolds number condition. |
| Key words: Low pressure turbine~+ Loading distribution~+ Reynolds number Boundary layer |
