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首页> 外文期刊>Journal of turbomachinery >Experimental Study of Oscillating Freestream Effect on the Spatiotemporal Distributions of Leading-Edge Film Cooling
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Experimental Study of Oscillating Freestream Effect on the Spatiotemporal Distributions of Leading-Edge Film Cooling

机译：振荡自由流效应对前缘薄膜冷却时空分布的实验研究

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摘要

An experimental study was conducted to investigate the influence of mainstream oscillations on spatio-temporal variation of leading-edge film cooling effectiveness. The investigation utilized fast-response pressure-sensitive paint (Fast-PSP) technique at high frame rate. During the experiment, coolant (i.e., CO_2, DR = 1.53) was discharged into three rows of cylindrical holes. Various blowing ratios (i.e., M = 0.50, 0.75, 1.00, and 1.50) were tested under the steady (i.e., f= 0 Hz) and oscillating (i.e., f= 7 Hz and 25 Hz) conditions. The measured instantaneous effectiveness was analyzed in terms of time-averaged and phase-averaged results. The results revealed that the mainstream oscillation, consisting of simultaneous pressure and velocity oscillation, significantly influences the behavior of the film cooling effectiveness. The time-averaged effectiveness significantly decreased at high oscillating frequency (i.e., 13.0-19.8% reduction at M = 0.50, f-25 Hz compared withf=0 Hz), especially at low blowing ratios (i.e., M=0.50 and 0.75). The phase-averaged results captured significant decay in the film distributions associated with backflow caused by negative pressure gradients in coolant holes at certain phases. However, the mainstream oscillation effect was relatively insignificant at high blowing ratios (i.e., M = 1.00 and 1.50), which revealed the robustness of coolant coverage at low coolant Strouhal number (i.e., high blowing ratio) under the same oscillating frequency. Furthermore, the unsteady coolant intermittency showed highly unstable film coverage at high coolant Strouhal number. The coolant decay associated with backflow at high coolant Strouhal number should be considered by the gas-turbine designers in order to improve the lifecycle of turbine blades.
机译：进行了实验研究，以研究主流振荡对前沿膜冷却效果的时空变化的影响。该研究利用了高帧速率的快速响应压敏涂料（FAST-PSP）技术。在实验期间，将冷却剂（即CO_2，DR = 1.53）排放到三排圆柱孔中。在稳定（即，F = 0Hz）和振荡（即F = 7 Hz和25 Hz）条件下测试各种吹血比（即，M = 0.50,0.75,1.5,10.50）。在时间平均和相平均结果方面分析了测量的瞬时效果。结果表明，主流振荡，由同时压力和速度振荡组成，显着影响薄膜冷却效果的行为。在高振荡频率（即M = 0.50，F-25Hz降低13.0-19.8％的高振荡频率下，时间平均效果显着降低，特别是在低吹量比（即M = 0.50和0.75）下。相平均结果在与某些相位的冷却剂孔中的负压梯度引起的回流相关的薄膜分布中捕获了显着的衰减。然而，主流振荡效应在高吹气比（即，M = 1.00和1.50）上相对微不足道，其在相同的振荡频率下揭示了低冷却剂Strouhal数（即，高吹倍率）下冷却剂覆盖的鲁棒性。此外，不稳定的冷却剂间歇性在高冷却剂斯特鲁壳数下显示出高度不稳定的薄膜覆盖率。气涡轮机设计人员应考虑与高冷却剂斯特鲁姆数的回流相关的冷却剂衰减，以改善涡轮叶片的生命周期。

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  • 来源
    《Journal of turbomachinery》 |2021年第1期|011002.1-011002.15|共15页
  • 作者

    Hongyi Shao; Mohamed Qenawy; Tianlun Zhang; Di Peng; Yingzheng Liu; Wenwu Zhou;

  • 作者单位

    Key Lab of Education Ministry for Power Machinery and Engineering Gas Turbine Research Institute School of Mechanical Engineering Shanghai Jiao Tong University 800 Dongchuan Road Shanghai 200240 China;

    Key Lab of Education Ministry for Power Machinery and Engineering Gas Turbine Research Institute School of Mechanical Engineering Shanghai Jiao Tong University 800 Dongchuan Road Shanghai 200240 China;

    Key Lab of Education Ministry for Power Machinery and Engineering Gas Turbine Research Institute School of Mechanical Engineering Shanghai Jiao Tong University 800 Dongchuan Road Shanghai 200240 China;

    Key Lab of Education Ministry for Power Machinery and Engineering Gas Turbine Research Institute School of Mechanical Engineering Shanghai Jiao Tong University 800 Dongchuan Road Shanghai 200240 China;

    Key Lab of Education Ministry for Power Machinery and Engineering Gas Turbine Research Institute School of Mechanical Engineering Shanghai Jiao Tong University 800 Dongchuan Road Shanghai 200240 China;

    Key Lab of Education Ministry for Power Machinery and Engineering Gas Turbine Research Institute School of Mechanical Engineering Shanghai Jiao Tong University 800 Dongchuan Road Shanghai 200240 China;

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  • 正文语种 eng
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  • 关键词

    film cooling; spatial-temporal; leading-edge; fast-PSP; oscillating flow; heat transfer and film cooling; measurement techniques;

    机译：薄膜冷却;空间颞;前沿;快速psp;振荡流动;传热和薄膜冷却;测量技术;

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