航空学报 > 2019, Vol. 40 Issue (3): 122651-122651   doi: 10.7527/S1000-6893.2018.22651

尾迹对涡轮动叶全表面气膜冷却效率的影响

陈大为, 朱惠人, 李华太, 刘海涌, 周道恩   

  1. 西北工业大学 动力与能源学院, 西安 710129
  • 收稿日期:2018-09-06 修回日期:2018-10-25 出版日期:2019-03-15 发布日期:2018-11-20
  • 通讯作者: 朱惠人 E-mail:zhuhr@nwpu.edu.cn
  • 基金资助:
    中央高校基本科研业务费专项资金(3102018zy019)

Effect of unsteady wake on full coverage film cooling effectiveness for a turbine blade

CHEN Dawei, ZHU Huiren, LI Huatai, LIU Haiyong, ZHOU Daoen   

  1. School of Power and Energy, Northwestern Polytechnical University, Xi'an 710129, China
  • Received:2018-09-06 Revised:2018-10-25 Online:2019-03-15 Published:2018-11-20
  • Supported by:
    the Fundamental Research Funds for the Central Universities(3102018zy019)

摘要: 采用压敏漆(PSP)测量技术研究了尾迹对涡轮动叶气膜冷却效率的影响,测试叶片带有11排圆柱形气膜孔。获得了不同质量流量比和尾迹斯特劳哈尔数(Sr=0,0.12,0.36)条件下全表面气膜冷却效率分布的试验数据,结果表明:随着尾迹Sr数的增加,叶片前缘区域径向平均气膜冷却效率最大降低幅度达36.5%,吸力面径向平均气膜冷却效率最大降低幅度达53.5%,压力面径向平均气膜冷却效率最大降低幅度达24.2%;尾迹对前缘和吸力面气膜冷却效率的影响大于压力面;随着质量流量比增加,尾迹的影响减小;在进行涡轮动叶表面气膜冷却结构设计时,不考虑尾迹效应会增加设计风险。

关键词: 尾迹, 气膜冷却效率, 压敏漆技术, 质量流量比, 斯特劳哈尔数, 涡轮叶片

Abstract: The effect of unsteady wake on the film cooling effectiveness of the turbine blade is studied using the Pressure Sensitive Paint (PSP) measurement technique. The test blade has eleven rows of cylindrical film holes. The distribution of the film cooling effectiveness on the whole blade surface under different mass flux ratios and different wake Strouhal numbers (Sr=0, 0.12, 0.36) are obtained. The results show that as the wake Strouhal number increases, the radial averaged film cooling effectiveness of the leading edge decreases by up to 36.5%, the radial averaged film cooling effectiveness of the suction surface decreases by up to 53.5%, and that of the pressure surface decreases by up to 24.2%. The effect of wake on the leading edge and the suction surface is greater than that on the pressure surface. As the mass flux ratio increases, the effect of the unsteady wake decreases. When designing the cooling structure of the turbine blade, ignoring the effect of the wake increases the design risk.

Key words: wakes, film cooling effectiveness, PSP technique, mass flux ratio, Strouhal number, turbine blade

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