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首页> 外文会议>ASME Turbo Expo: Turbomachinery Technical Conference and Exposition >Controlling Leakage Flows over a Rotor Blade Tip Using Air-Curtain Injection: Part I — Aero-Thermal Performance of Rotor Tips
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Controlling Leakage Flows over a Rotor Blade Tip Using Air-Curtain Injection: Part I — Aero-Thermal Performance of Rotor Tips

机译：使用空气窗帘注射控制泄漏流过转子叶片尖端：第一部分 - 转子尖端的空气热性能

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The rotor casing of gas turbine engines is generally cooled with cooling air from compressors and then the cooling air is discharged into the passage flow of the rotor. In this paper, a novel design both for the blade tip leakage flow control and for the rotor casing and tip cooling is proposed. Cooling air is injected through a pair of inclined rows of discrete holes positioned between 30% and 50% axial chord downstream of the blade leading edge in the casing. The casing injection forms as air-curtain within the blade tip gap, and inhibits the development of the tip leakage flows and provides secondary-order cooling for the rotor tip. Air injection from the rotor casing onto flat and recessed blade tips is investigated using numerical simulations that is validated by extensive aerodynamic and heat transfer experimental data. Flow and film cooling over the blade tip and turbine overall aerodynamic performance are examined in detail for two casing injection rates. Comparisons between flat tip without casing injection (baseline) case and the casing injection cases show that the air-curtain injection significantly alters the flow structures near the casing by modifying the development and migration of the tip leakage flow. The air-curtain injection over the flat and recessed tips both generates turbine stage overall aerodynamic efficiency improvement due to the sealing effects of the casing injection, but the efficiency gain depends on the competing results between the sealing effects and the "over-blown" effects of the air-curtain injection. Applying a recess to the blade tip is generally detrimental to the efficiency improvement by the air-curtain injection. In addition to efficiency improvement, secondary-order cooling effects from the casing injection are found to provide considerable thermal protection for the blade tips. However, increasing injection rate reduces the film cooling performance over the rotor tip surfaces. The recessed tip could present better film cooling effectiveness than the flat tip in the presence of the air-curtain.
机译：燃气涡轮发动机的转子壳体通常通过来自压缩机的冷却空气冷却，然后将冷却空气排放到转子的通道流中。在本文中，提出了一种用于叶片尖漏流量控制和转子壳体和尖端冷却的新颖设计。冷却空气通过一对倾斜行的离散孔注入，位于壳体中的刀片前缘下游的30％和50％轴向弦之间。壳体喷射形式作为叶片尖端间隙内的空气帘，并且抑制尖端泄漏流的发展，并为转子尖端提供二次级冷却。使用通过广泛的空气动力学和传热实验数据验证的数值模拟，研究了从转子壳体到平坦和凹进的刀尖上的空气喷射。对叶片尖端和涡轮机的流动和薄膜进行详细检查了两个套管注射率的详细检查了整体气动性能。平坦尖端之间的比较没有套管注射（基线）壳体和套管注射盒，显示空气帘注射通过改变尖端泄漏流的开发和迁移，通过修改壳体的显着改变流动结构。通过套管注入的密封效果，透气和凹陷尖端上的空气窗帘注射均产生涡轮机级整体空气动力学效率，但效率增益取决于密封效果与“过度吹入”效果之间的竞争结果取决于竞争结果空幕注射。将凹槽施加到叶片尖端通常对空气帘注射的效率有害。除了提高效率的外，还发现来自套管喷射的二次秩序冷却效果为刀片提示提供相当大的热保护。然而，增加的注射速率降低了转子尖端表面上的薄膜冷却性能。凹陷尖端可以在空气窗帘存在下比平坦尖端呈现更好的薄膜冷却效果。

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