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透平进口温度持续提高,使得实验测试条件难以实现全温全压的测量,往往采用降温降压工况。本文采用耦合数值方法,分别针对耦合气膜冷却平板及耦合叶栅模型,分析多场耦合下的高-低温传热特征,探索透平冷却温度水平影响特性及机理。研究表明,综合冷却效率分布受金属、流体物性及内外部冷却多方面综合影响;比较无量纲参数相同的高-低温工况,高温使得有TBC涂层时综合冷效偏高,无TBC涂层时综合冷效偏低;无量纲参数相同的高-低温工况,在平板上综合冷却效率分布规律基本一致,在叶栅表面压力面和前缘较为一致,其余部分相差较多;在一定的温度差距内,高-低温工况结果仍可保持一定的一致性。
Turbine inlet temperature continues to increase, making the experimental test conditions difficult to achieve full temperature measurement of full pressure, often using cooling buck conditions. In this paper, the coupling numerical method is used to analyze the characteristics of high and low temperature heat transfer in multi-field coupling and the influence characteristics and mechanism of turbine cooling temperature level respectively. The results show that the distribution of the overall cooling efficiency is comprehensively influenced by the metal and fluid properties and the external and internal cooling. Compared with the high-low temperature conditions with the same dimensionless parameters, the high cooling temperature makes the TBC coating with high cooling efficiency and no TBC coating When the dimensionless parameters of the same high-low temperature conditions, the overall cooling efficiency of the flat distribution of the law is basically the same, the surface pressure in the blade surface and the leading edge are more consistent with the rest of the more difference; in a certain Within the temperature difference, the results of high-low temperature conditions can still maintain a certain consistency.