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首页> 外文会议>ASME Turbo Expo vol.6 pt.A; 20050606-09; Reno-Tahoe,NV(US) >An investigation of the effects of film cooling in a high-pressure aeroengine turbine stage
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An investigation of the effects of film cooling in a high-pressure aeroengine turbine stage

机译：高压航空发动机涡轮级中薄膜冷却效果的研究

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Cooling is required to enable the turbine components to survive and have acceptable life in the very high gas temperatures occurring in modern engines. The cooling air is bled from the compression system, with typically about 15% of the core flow being diverted in military engines and about 20% in civil turbofans. Cooling benefits engine specific thrust and efficiency by allowing higher cycle temperatures to be employed, but the bleed air imposes cycle penalties and also reduces the aerodynamic efficiency of the turbine blading, typically by 2-4%. Cooling research aims to develop and validate improved design methodologies that give maximum cooling effectiveness for minimum cooling flow. This paper documents external cooling research undertaken in the Isentropic Light Piston Facility at QinetiQ as part of a European collaborative programme on turbine aerodynamics and heat transfer. In Phase Ⅰ, neither the ngv nor the rotor was cooled; cooling was added to the ngv only for Phase Ⅱ, and to the rotor and ngv in Phase Ⅲ. Coolant blowing rates and density ratios were also varied in the experiments. This paper describes the ILPF and summarises the results of this systematic programme, paying particular attention to the variation in aerofoil heat transfer with changing coolant conditions, and the effects coolant ejection has on the aerofoil's aerodynamic performance.
机译：需要冷却以使涡轮机部件能够在现代发动机中出现的极高气体温度下存活并具有可接受的寿命。冷却空气从压缩系统中抽出，通常约有15％的核心流在军用发动机中转移，约20％在民用涡轮风扇中。冷却通过允许采用更高的循环温度而有益于发动机特定的推力和效率，但是引气施加了循环损失，并且还降低了涡轮叶片的空气动力学效率，通常降低了2-4％。冷却研究旨在开发和验证改进的设计方法，这些设计方法可在最小冷却流量的情况下提供最大的冷却效率。本文记录了QinetiQ的等熵轻型活塞设施中进行的外部冷却研究，这是欧洲有关涡轮空气动力学和传热合作计划的一部分。在阶段Ⅰ中，ngv和转子均未冷却。冷却仅在Ⅱ相中被添加到ngv中，在Ⅲ相中被添加到转子和ngv中。实验中冷却剂的吹入速率和密度比也有所不同。本文介绍了ILPF，并总结了该系统程序的结果，特别注意了随着冷却剂条件的变化，机翼传热的变化，以及冷却剂的喷射对机翼空气动力性能的影响。

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