摘要
为了研究孔型对平板表面微颗粒沉积特性的影响规律,本文开展常温条件下的微颗粒沉积实验,用雾化后的石蜡代替微颗粒,气膜冷却平板为实验件。实验选用了典型圆柱、圆锥、CONSOLE、RTSH、后倾扇形以及扩张扇形六种不同孔型实验件,研究了微颗粒在不同孔型实验件表面的沉积分布、沉积量变化规律。实验结果表明:在本文的研究工况下,所有实验件压力面的沉积分布集中在气膜孔下游;与圆柱孔相比,本文的五种气膜冷却孔型都可以有效降低平板表面微颗粒的沉积,CONSOLE孔沉积率相对减少了69%,其余孔型减少了80%左右。但沉积前后冷却效率变化并不明显,随后以圆柱孔型实验件探究不同冷气温度下的沉积特性,结果表明,沉积率随冷气温度的降低而升高,且冷气温度越低,沉积前后冷却效率变化越明显。
In order to investigate the deposition characteristics of particles on the surface of plate,a simulating experiment was conducted at room temperature,in which the atomized wax was utilized as the particles and the test model was a flat plate.Six different types of film cooling hole specimens were selected for the experiment,including cylindrical,conical,CONSOLE,RTSH,Laidback fan-shaped,and fan-shaped film cooling holes.The deposition distribution and deposition amount variation on the surface of the different hole specimens were studied.The experimental results showed that the deposition distribution on the pressure surface was concentrated downstream of the film cooling holes.Compared with the cylindrical holes,the five types of air film cooling holes in this study could effectively reduce the deposition of particles on the surface of the flat plate.The deposition rate of the CONSOLE hole decreased by about 69%,and the deposition rate of the other hole types decreased by about 80%.But the cooling efficiency remained relatively constant before and after deposition.Further experiments with cylindrical specimens revealed that the deposition rate tends to increase as the cooling air temperature drops.Moreover,the lower the cooling air temperature,the more pronounced the change in cooling efficiency becomes between the pre-and post-deposition stages.
作者
阮荣胜
刘振刚
程龙
张义轩
刘振侠
吴丁毅
RUAN Rongsheng;LIU Zhengang;CHENG Long;ZHANG Yixuan;LIU Zhenxia;WU Dingyi(School of Power and Energy,Northwestern Polytechnical University,Xi'an 710072,China)
出处
《工程热物理学报》
北大核心
2025年第6期1975-1990,共16页
Journal of Engineering Thermophysics
关键词
颗粒沉积
孔型
沉积率
冷却效率
气膜冷却
particle deposition
hole shapes
deposition rate
cooling effectiveness
flm cooling
