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非设计攻角对涡轮叶片叶型损失的影响特点分析 预览

Effects of Off-Design Incidences on Turbine Blade Profile Loss
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摘要 为了得到非设计攻角下涡轮叶片的叶型损失规律,采用数值模拟的方法对某高负荷低压涡轮前加载叶型在5种不同攻角下的流动进行了详细的分析,得到了5种攻角下叶片表面的各种流动参数。结果表明:在设计攻角下,叶片的性能表现最佳,此时叶栅中的气流流动均匀,速度梯度、压力梯度分布符合一定规律,并未发生明显的附面层分离现象;在负攻角下,吸力面的流动情况保持良好而压力面的损失较为明显,且随着负攻角的增大损失系数也逐渐增大,但负攻角下损失系数的增幅整体上并不大,当负攻角增加到-20°时其损失系数只有0.048;在正攻角下,压力面的流动情况保持良好而吸力面的损失较为明显,且这种损失比负攻角下压力面的损失要大得多;当正攻角为10°时其损失系数已达到0.141,远远超过-20°攻角下的损失系数。因此,在进行叶型设计的时候一定要留有合适的正攻角裕度。 In order to get the law of profile loss of turbine blade on off-design incidence,a numerical simulation was carried out to analyze the flow of a high-lift low-pressure turbine at five different incidences,and to get the flow parameters of blade on five different incidences. The results show thatthe performance of the blade is the best at the design incidence,the air flow is equable,and the distribution of velocity gradient and pressure gradient is rule. There is no obvious boundary layer separation. In negative incidences,the flow on suction surface is well but the loss is obvious on pressure surface,and the larger negative incidence,the greater loss coefficient,but the increase of the loss coefficient is not large as a whole,the loss coefficient is only 0. 048 when the negative incidence increases to-20°. In positive incidences,the flow on pressure surface is well but the loss is obvious on suction surface,and the loss is much greater than the pressure surface of negative incidences. When the positive incidence is 10°,its loss coefficient has reached 0. 141,which is far more than the loss coefficient of-20°. Therefore,it is important to keep fit margin of positive incidences in blade profile design.
作者 张宗辰 杜睆实 付海涛 马丽萍 白涛 ZHANG Zongchen;DU Huanshi;FU Haitao;MA Liping;BAI Tao;Chinese Flight Test Establishment,Aviation Industry Corporation of China;School of Aircraft,Xi'an Aeronautical University;
出处 《重庆理工大学学报:自然科学版》 2017年第11期109-116,178共9页 Journal of Chongqing Institute of Technology
基金 西安航空学院校级科研基金资助项目(2017KY1230)
关键词 高负荷低压涡轮 攻角 前加载 附面层分离 叶型损失 high-lift low-pressure turbine incidences front-loaded boundary layer separation profile loss
作者简介 张宗辰(1994-),男,陕西西安人,硕士研究生,主要从事航空发动机气动热力学研究,E-mail:744493714@qq.com.
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