【作者】 张晶；

【导师】 吉洪湖；

【作者基本信息】 南京航空航天大学 ， 航空宇航推进理论与工程， 2010， 硕士

【摘要】 为了提高现代燃气轮机的比功率,在材料强度允许的情况下应尽可能提高燃烧室内燃气温度。目前发动机火焰筒壁面采用的高温合金材料最高许用温度约为1300K,而先进发动机火焰筒内燃气最高温度已经达到2400K。为了保证火焰筒的安全,必须对火焰筒壁面采用有效的冷却。全覆盖气膜冷却是目前一种先进的壁面冷却方式,多斜孔壁冷却是实现全覆盖气膜冷却的一种方法。目前国内外已经对多斜孔壁冷却展开了大量的研究,但进一步提高冷却效果仍然是一个富于挑战和创新的研究课题。本文针对火焰筒多斜孔壁的冷却,主要开展了两方面的研究:一、通过数值模拟研究了掺混角对气膜冷却效果的影响。在相同的流动边界条件下,入射角为20°时,计算分析了不同掺混角的火焰筒壁的气膜冷却效果。分析了掺混角对主流温度、压力、密度、速度等参数的影响。研究结果证明,当掺混角为60°时,综合冷却效果最好。二、根据已有的研究结果,编制了一个计算火焰筒多斜孔气膜冷却壁面温度分布的一维设计程序。该程序可用于火焰筒初步设计阶段的壁温估算。更多还原

【Abstract】 In order to improve the specific power of modern gas turbine, temperature in combustion chamber must be improve as much as possible under the circumstances permitted by the strength of the material. Launched the flame tube wall is currently used in high-temperature alloy materials, the maximum allowable temperature is about 1300K, while the maximum temperature of gas in flame tube reached 2400K. In order to ensure the safety of flame tube, an effective cooling must be use on it.Full-coverage film cooling is a more advanced wall cooling method. It has already started a lot of research on Full-coverage film cooling interiorly and abroad, but the innovative technique enhancing the film cooling efficiency is also regarded as a challenging problem.In connection with Film Cooling of Multi-Inclined holes wall, this paper mainly research on two aspects:Firstly, at the same circumstances, this paper did a numerical research on Film Cooling Effectiveness by different mixing angles while the inject angle is 20°. By systematically analyzed the influences by mixing angles on mainstream’s temperature, pressure, density, velocity, and Film Cooling Effectiveness, that when the mixing angle is 60°, the integrated Cooling Effect is the best.Secondly, based on the recognized concludes, this paper composed a semi-theoretical and semi-empirical One-dimensional program to calculate the temperatures of flame tube wall.更多还原