THERMAL SCIENCE

International Scientific Journal

Authors of this Paper

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Miao Gong

,

Wen Huang

,

Yuanhang Shen

,

Cunyuan Ma

INFLUENCE MECHANISM OF LOCAL AIR FILM HOLES BLOCKAGE ON COOLING EFFICIENCY OF TURBINE BLADES

ABSTRACT
In order to explore the cooling air film damage mechanism of aero-engine turbine blades in different blockage states, the air film cooling efficiency, outlet temperature and flow rate variations have been studied in three typical positions with different blockage ratios. The results show that the blockage of the air film holes decreases the air film cooling efficiency in the downstream region of the outlet boundary, and the decreasing amplitude increases non-linearly. When the temperature of the air film hole is lower than 1100 K, the cross-section of the air film gradually flattens out and the air film becomes thinner with the increase of the blocking ratio. When the blockage is in inlet position A, and B = 0.8, the influence on cooling efficiency of the air film performs most apparently. Moreover, when the cooling efficiency is near x/d = 1, the decreasing amplitude of efficiency reaches more than 7%. When the cooling efficiency is near x/d = 4, the decreasing amplitude of efficiency reaches more than 10%. In these two conditions, the effective protective air film area is the smallest, and the angle between the high temperature mainstream and the cooling fluid is the smallest, and the cooling fluid and the high temperature mainstream are the weakest in terms of resistance. Experiments on the effect of cooling fluid coverage of static blades have been conducted, and the results indicate that in the case of local air film holes blockage, the trend of damage degree of the cooling flow field is in good consistency with the analyzed results of the numerical model.
KEYWORDS
turbine blade, Air film hole, blockage, Air film cooling, traffic
PAPER SUBMITTED: 2023-09-05
PAPER REVISED: 2023-11-25
PAPER ACCEPTED: 2023-11-30
PUBLISHED ONLINE: 2024-02-18
DOI REFERENCE: https://doi.org/10.2298/TSCI230905012G
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2024, VOLUME 28, ISSUE Issue 1, PAGES [641 - 657]
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Influence mechanism of local air film holes blockage on cooling efficiency of turbine blades

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence