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首页> 外文期刊>Journal of Heat Transfer >Unsteady Wake and Coolant Density Effects on Turbine Blade Film Cooling Using Pressure Sensitive Paint Technique
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Unsteady Wake and Coolant Density Effects on Turbine Blade Film Cooling Using Pressure Sensitive Paint Technique

机译：使用压敏涂料技术对涡轮叶片薄膜冷却的非恒定的尾迹和冷却剂密度影响

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摘要

The effect of an unsteady stator wake (simulated by wake rods mounted on a spoke-wheel wake generator) on the modeled rotor blade is studied using the pressure sensitive paint (PSP) mass-transfer analogy method. Emphasis of the current study is on the midspan region of the blade. The flow is in the low Mach number (incompressible) regime. The suction (convex) side has simple angled cylindrical film-cooling holes; the pressure (concave) side has compound angled cylindrical film-cooling holes. The blade also has radial shower-head leading edge film-cooling holes. Strouhal numbers studied range from 0 to 0.36; the exit Reynolds number based on the axial chord is 530,000. Blowing ratios range from 0.5 to 2.0 on the suction side and 0.5 to 4.0 on the pressure side. Density ratios studied range from 1.0 to 2.5, to simulate actual engine conditions. The convex suction surface experiences film-cooling jet lift-off at higher blowing ratios, resulting in low effectiveness values. The film coolant is found to reattach downstream on the concave pressure surface, increasing effectiveness at higher blowing ratios. Results show deterioration in film-cooling effectiveness due to increased local turbulence caused by the unsteady wake, especially on the suction side. Results also show a monotonic increase in film-cooling effectiveness on increasing the coolant to mainstream density ratio.
机译：使用压敏涂料（PSP）传质模拟方法研究了非定常定子尾流（由安装在辐条轮尾流发电机上的尾流杆模拟）对模型转子叶片的影响。当前研究的重点是叶片的中跨区域。流动处于低马赫数（不可压缩）状态。吸气（凸面）侧具有简单的成角度的圆柱形薄膜冷却孔；压力（凹面）侧具有复合角度的圆柱形薄膜冷却孔。该叶片还具有径向喷淋头前缘薄膜冷却孔。研究的Strouhal数范围为0到0.36；基于轴向弦的出口雷诺数为530,000。吹气比在吸力侧为0.5至2.0，在压力侧为0.5至4.0。为了模拟实际的发动机状况，研究的密度比在1.0到2.5的范围内。凸形的吸力面在较高的吹风比下会经历薄膜冷却的射流剥离，从而导致较低的有效值。发现薄膜冷却剂重新附着在凹面压力表面的下游，从而提高了较高吹塑比时的效率。结果表明，由于不稳定的尾流（尤其是在吸力侧）引起的局部湍流增加，导致薄膜冷却效果下降。结果还表明，随着冷却剂与主流密度比的增加，薄膜冷却效率也单调增加。

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  • 来源
    《Journal of Heat Transfer》 |2012年第8期|p.081701.1-081701.10|共10页
  • 作者

    Akhilesh P. Rallabandi; Shiou-Jiuan Li; Je-Chin Han;

  • 作者单位

    Turbine Heat Transfer Laboratory,Mechanical Engineering Department,Texas A&M University,College Station, TX 77843-3123;

    Turbine Heat Transfer Laboratory,Mechanical Engineering Department,Texas A&M University,College Station, TX 77843-3123;

    Turbine Heat Transfer Laboratory,Mechanical Engineering Department,Texas A&M University,College Station, TX 77843-3123;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    unsteady wake; film-cooling effectiveness; pressure sensitive paint;

    机译：不稳定的唤醒;薄膜冷却效果;压敏涂料;

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