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Numerical and experimental investigation of infrared radiation characteristics of a turbofan engine exhaust system with film cooling central body

机译:具有薄膜冷却中心体的涡扇发动机排气系统红外辐射特性的数值和实验研究

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摘要

A new concept of film cooling central body for the exhaust system of turbofan engine was brought out to suppress the infrared radiation of engine in this paper. The ability of infrared suppression was estimated by experiments and numerical calculations. The numerical method, which use forward-backward ray tracing and narrow band model, had been validated by the experimental results. The aerodynamic characteristics and infrared radiation distribution of exhaust system with/without film cooling central body were investigated for several different configurations. The experimental results reveal that the bypass flow can be used to cooling the central body and suppress the infrared radiation at the rear aspect of the engine. The inlet area of lugs in the bypass passage determined the mass flow rate into the central body. To obtain the effects of the film cooling holes configuration on the surface temperature and infrared radiation intensity of the exhaust system, a series of computations on full scale exhaust system have been performed. The numerical simulation results indicate that the film cooling central body can suppress the infrared radiation of the inside enclosure by 40-70% comparing to the central body without the film cooling at zero degree aspect (normal to nozzle outlet). The film cooling central body for exhaust system of turbofan engine has remarkable ability to suppress the infrared radiation from the inside enclosure of nozzle.
机译:为了抑制发动机的红外辐射,提出了一种新的涡轮风扇发动机排气系统薄膜冷却中心体的概念。通过实验和数值计算来估计红外抑制的能力。实验结果验证了采用前向后射线追踪和窄带模型的数值方法。针对几种不同的配置,研究了带有/不带有薄膜冷却中心体的排气系统的空气动力学特性和红外辐射分布。实验结果表明,旁路流可用于冷却中央车身并抑制发动机后部的红外辐射。旁通通道中凸耳的入口面积决定了进入中央阀体的质量流量。为了获得薄膜冷却孔构型对排气系统的表面温度和红外辐射强度的影响,已经对全尺寸排气系统进行了一系列计算。数值模拟结果表明,与不进行零角度(垂直于喷嘴出口)的薄膜冷却的中心体相比,薄膜冷却的中心体可以抑制内部壳体的红外辐射达40-70%。涡扇发动机排气系统的薄膜冷却中心体具有卓越的抑制喷嘴内壳红外辐射的能力。

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