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| 轮毂封严气体对高压涡轮二次流动的影响 |
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周杨1,2, 牛为民3,4, 邹正平1,2, 刘火星1,2, 李维5
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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.哈尔滨东安集团航空发动机研究所;4.黑龙江哈尔滨150066;5.中国航空动力机械研究所 湖南株洲412002
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| 摘要: |
| 利用数值模拟手段研究了高压涡轮转静子交接处封严腔中气体对涡轮内部流动结构及涡轮性能的影响。分别对没有冷气和冷气流量比例分别为1.1%,2.2%,3.75%和4.5%五种不同的情况进行了计算,并对比分析了有无冷气时流场中的流动情况和二次流的发展过程。结果表明封严腔中冷气射入主流对涡轮性能和流场结构都有较大的影响,导致了涡轮做功能力下降,效率降低,特别是对转子根部的影响最为明显。冷气流量的加大会导致转子负攻角的加大,对吸力面的流动分离有抑制作用,但负攻角过大会导致压力面发生分离。在涡轮叶型的设计中,必须对封严泄漏气体的影响加以考虑。 |
| 关键词: 封严 高压涡轮 二次流动 数值仿真 |
| DOI： |
| 分类号:V235.1 |
| 基金项目:国家自然科学基金(50546013);航空基础学科基金(03C51030) |
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| Effects of coolant injection from rim seals on secondary flow in a high-pressure turbine |
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ZOU Zheng-ping,NIU Wei-min,ZOU Zheng-ping,LIU Huo-xing,LI Wei
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1.National Lab.of Aircraft Engine,Beijing Univ.of Aeronautics and Astronautics,Beijing 100083,China;2.Harbin Dong’an Engine(Group) Co.,Ltd,Harbin 150066,China;3.Chinese AviationPowerplant Research Inst.,Zhuzhou 412002,China
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| Abstract: |
| The flow field and secondary flow in a high-pressure turbine with and without coolant injection from rim seals were studied numerically.The effects of coolant injection with four different cooling air mass flow percentage at 1.4%,2.5%,3.75% and 4.5%,respectively was investigated.The results suggest that the cooling air plays a role in turbine performance and main structure of flow field.It decreases turbine efficiency.The negative angle of incidence increases as the rate of the cooling air increases.The negative angle of incidence can cause flow separation. |
| Key words: Sealing High-pressure turbine Secondary flow Numerical simulation |
