| Citation: | YANG Xiaojun, YU Tianhao, CUI Mohan, et al. Experiment on gas film cooling efficiency in environment of deposition[J]. Journal of Beijing University of Aeronautics and Astronautics, 2019, 45(8): 1681-1690. doi: 10.13700/j.bh.1001-5965.2018.0697(in Chinese)
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In order to study the effect of deposition of pollutants on film cooling of gas turbine blades, the experiments were carried out by injecting molten paraffin wax into a small wind tunnel to simulate the pollutants in a real turbine. The blades were approximately replaced by flat plates. The experiments were carried out under mixing conditions of high temperature mainstream and low temperature cold flow. The influence of particulate matter deposition on the surface of the workpiece and the changing trend of film cooling effect after paraffin deposition. It was found that under the same experimental conditions, with the increase of the aperture, the film cooling efficiency increases gradually, and the cooling efficiency at the aperture of 10 mm is about 6% higher than that at 5 mm. At the same time, the paraffin deposition on the plate surface decreases gradually, and the thickness difference is 0.15-0.20 mm. With the increase of the surface roughness of the plate, the film cooling efficiency decreases gradually. However, the deposition of paraffin increases gradually, and the film cooling efficiency after deposition decreases greatly compared with that before the deposition of paraffin particles, with a difference of about 5%.
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