脉动来流下燃氢涡轮叶栅端壁气膜冷却特性

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中图分类号：TK474.4 文献标志码：A

DOI： 10.7652/xjtuxb202510007 文章编号：0253-987X（2025）10-0075-12

Film Cooling Characteristics of Hydrogen-Fueled Turbine Cascade Endwall under Pulsating Inflow Conditions

ZHANG Hao，BAI Bo，LI Zhigang，LI Jun （School of Energy and Power Engineering，Xi’an Jiaotong University，Xi'an 7loo49，China）

Abstract： To clarify the effects of hydrogen-blended/full-hydrogen combustion-induced gas pulsation on the convective heat transfer and cooling characteristics of downstream turbine cascades， based on real hydrogen-blended/full-hydrogen combustion pulsation measurement data and transonic wind tunnel test data from a research institute and employing unsteady numerical methods，the influence of gas pulsation frequencies （1，3，and 5kHz ） on the endwall flow and film cooling performance of a turbine cascade under design operating conditions is investigated. The results show that pulsating inflow significantly reduces the endwall film cooling effectiveness， exhibiting non-monotonic frequency dependence. The smallest reduction in film cooling effectiveness （approximately 4.02% ）occurs at 3kHz ，while the largest reduction （approximately 11.28% ）occurs at 5kHz . The fluctuation amplitude of film cooling effectiveness initially decreases and then increases with rising frequency，with the largest fluctuations observed downstream of the film cooling holes and near the cascade throat. The fluctuation frequency of film cooling effectiveness strictly synchronizes with the inlet pulsation frequency， indicating no attenuation of pulsation frequency within the cascade passage. As the pulsation frequency increases， the cavity vortex downstream of the step gradually expands toward the endwall. Under high-frequency （5kHz ）pulsation，the intensities of the cavity vortex and horseshoe vortex significantly strengthen， destabilizing the secondary flow structures in the endwall region and leading to degraded film cooling performance and increased fluctuation amplitudes. This study reveals the coupled mechanism of flow and cooling as well as the pulsation characteristics in the endwall region of hydrogen-fueled turbine cascades，providing insights for the design of high-efficiency cooling configurations in endwall region.

Keywords： hydrogen-fired gas turbine; cascade endwall; pulsated flow; film cooling effectiveness

传统化石能源燃烧会排放大量二氧化碳，进而引发温室效应，导致全球变暖问题愈发严重。（剩余15889字）