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首页> 外文会议>ASME turbine blade tip technical symposium 2013 : Turbine blade tip steady and unsteady aerodynamics ... >EFFECTS OF BLADE DEGRADATION ON TURBINE PERFORMANCE
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EFFECTS OF BLADE DEGRADATION ON TURBINE PERFORMANCE

机译：叶片降解对涡轮性能的影响

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摘要

The degradation of gas turbine parts due to aging leads to changes in airfoil shape and often causes performance loss. Although the degradation mechanisms and their effects on performance are understood in general (e.g. it is well known that fouling of compressor airfoils reduces mass flow and efficiency), the first quantitative relationships between specific types of part degradation and performance characteristics have only recently been published. In this paper the degradation of turbine blades with aft-loaded airfoils is considered. The typical deviations of shape were identified based on field experience. The effects of these deviations on turbine performance were assessed using different calculation methods, including 3D Navier-Stokes calculations and methods based on empirical correlations. The effect of blades-length reduction, chord-length reduction, changes in trailing-edge thickness and shape, and variation of stagger angle were analysed. The analysis showed that for aft-loaded airfoils without shrouds, the major influence on turbine performance is the degradation of radial clearances. A simplified engineering procedure allowing estimation of turbine performance loss due to degradation has been developed. This paper demonstrates how this simplified procedure, can be applied to the estimation of turbine recovery potential during a typical engine overhaul.
机译：由于老化而导致的燃气轮机零件的退化会导致翼型形状的变化，并经常导致性能损失。尽管通常已经了解了降解机理及其对性能的影响（例如，众所周知，压缩机翼型的结垢会降低质量流量和效率），但零件降解的特定类型与性能特征之间的第一个定量关系才刚刚发表。在本文中，考虑了带有后装式机翼的涡轮叶片的退化。根据现场经验确定了典型的形状偏差。使用不同的计算方法（包括3D Navier-Stokes计算和基于经验相关性的方法）评估了这些偏差对涡轮机性能的影响。分析了叶片长度减小，弦长减小，后缘厚度和形状变化以及交错角度变化的影响。分析表明，对于没有护罩的后装式机翼，对涡轮性能的主要影响是径向间隙的降低。已经开发了简化的工程程序，该程序可以估计由于退化而导致的涡轮机性能损失。本文演示了如何将这种简化的程序应用于典型发动机大修期间的涡轮恢复潜力估计。

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