| Citation: | YANG Xiaojun, YU Tianhao, HU Yingqi, et al. Experimental study on film cooling of turbine blade leading edge in deposition environment[J]. Journal of Beijing University of Aeronautics and Astronautics, 2021, 47(11): 2189-2199. doi: 10.13700/j.bh.1001-5965.2020.0380(in Chinese)
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In order to study the effect of deposition of pollutants on film cooling of blade leading edge of turbine, the experiment used paraffin deposition to simulate real deposits.By changing the mainstream temperature, the angle of film hole jet and the diameter of film hole, the variation of film cooling efficiency and deposition rate in deposition environment was observed experimentally. The experimental results show that the morphology of particulate deposition on the barrier surface is significantly affected by the mainstream temperature. When the mainstream temperature approaches the melting point of particulate matter, the deposition coverage is most obvious. Under the same experimental conditions, with the increase of jet angle, the coverage area of single film hole decreases, and the film cooling efficiency decreases. Before and after deposition, the maximum difference between film cooling efficiency at jet angle 25° and jet angle 65° is 2% and 5.6%, and deposition rate increases with the increase of jet angle; with the increase of pore diameter, the film cooling efficiency first decreases and then increases. Whether there is deposition or not, the film cooling efficiency of 4.5 mm pore diameter is the highest, 3.6% and 3.2% higher than that of 3 mm pore diameter. The deposition rate is the lowest when the pore diameter is 3 mm.
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