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所属单位：能源与动力学院
发表刊物：APPLIED THERMAL ENGINEERING
关键字：Film cooling Large eddy simulation Fanshaped hole Coherent structures
摘要：Large eddy simulation was applied for studying interaction between hot crossflow and coolant jet from a fanshaped hole. Simulations were performed at two blowing ratios, M = 0.5 and 1.5, and the Reynolds number, Re = 45674, based on the crossflow velocity and hole diameter. Downstream of shaped hole, plenty of hairpin vortexes distribute disorderly on the flat plate, and form 'forests of hairpin vortexes'. Roller vortexes and horseshoe vortexes are the important structures in the near filed region. Because of low jet velocity, fanshaped holes show weaker roller vortexes and horseshoe vortexes compared with round holes. In the far filed region, small-scale vortexes originating from break up of large-scale coherent structures take the dominant role. The projections of vortexes on vertical, spanwise and streamwise directions for fanshaped hole were discussed in detail. By time-frequency analysis of velocity fluctuation signals, the dominant frequency for fanshape holes is indistinct, and periodicity of film cooling of shaped holes is weaker than that of round hole. (C) 2017 Elsevier Ltd. All rights reserved.
ISSN号：1359-4311
是否译文：否
发表时间：2018-01-25
合写作者：张靖周,Feng, Hongke,Huang, Ying
通讯作者：张靖周,王春华