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首页> 外文会议>ASME(American Society of Mechanical Engineers) Turbo Expo vol.3 pt.A; 20050606-09; Reno-Tahoe,NV(US) >THE INFLUENCE OF HEAT TRANSFER EFFECTS ON TURBINE PERFORMANCE CHARACTERISTICS
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THE INFLUENCE OF HEAT TRANSFER EFFECTS ON TURBINE PERFORMANCE CHARACTERISTICS

机译：传热效果对汽轮机性能的影响

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摘要

A method allowing the evaluation of the effects related to heat transfer to the turbine blades on its performance characteristics is presented. The effects investigated are the change of passage dimensions, resulting from heat transfer and the change in flow field, exhibited mainly as a different boundary layer development. Change of hot gas temperature combined with cooling air temperature and possibly flow rate, result in a change of the temperature of the blade material, leading to dimension changes, because of the thermal expansion (dilatation). The changes in dimensions have a direct effect on turbine performance. An immediate consequence is a modification of the mass flow characteristic, due to a change of the throat area. Heat transfer also influences the properties of the gas flowing through the passage and in particular the characteristics of the boundary layers developing on the nozzle vanes and hub, tip endwals. Change of the thickness of this layer results in a change of blockage through the passage, a fact that influences directly the turbine flow function. The influence of both effects on turbine performance is studied. The study is performance oriented, aiming to the derivation of simplified models, which can be introduced in engine cycle decks.
机译：提出了一种方法，该方法可以评估与传热到涡轮叶片的性能有关的影响。研究的影响是由于传热和流场变化引起的通道尺寸变化，主要表现为不同的边界层发展。热气温度的变化与冷却空气温度以及可能的流量相结合，会导致叶片材料温度的变化，由于热膨胀（膨胀）而导致尺寸变化。尺寸的变化直接影响涡轮机的性能。由于喉部面积的变化，直接后果是质量流量特性的改变。传热还影响流过通道的气体的特性，特别是影响在喷嘴叶片和轮毂，尖端尾部上形成的边界层的特性。该层厚度的改变导致通过通道的堵塞的改变，这一事实直接影响涡轮的流动功能。研究了这两种效应对涡轮性能的影响。这项研究以性能为导向，旨在简化模型的推导，可以将其引入发动机循环甲板。

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