舰船排气羽流红外辐射特性计算研究

舰船动力系统的高温排气羽流是舰船红外辐射的重要来源之一，通过建立基于CFD数值方法的排气羽流流场分布模型和基于窄带模型C-G近似方法的高温排气红外辐射模型，重点研究了合成风速对排气羽流流场和红外辐射的影响。仿真结果表明:合成风速的大小对排气羽流的形状及辐射分布区域影响显著，合成风速增加一倍的情况下，排气羽流在中波红外谱段平均辐射强度降低了48.1%。也对计算模型可能产生偏差的物理因素进行了初步分析，如不完全燃烧产生的碳粒子对羽流红外辐射传输有显著影响。

Computation of infrared radiation from ship exhaust plumes

High temperature exhaust plumes of warship power system is an important source of infrared radiation. In this paper, the flow field of ship exhaust plumes was calculated based on CFD methods. Then, a calculation method of high temperature exhaust plume's infrared radiation was obtained by utilizing the C-G approximation method laced on a narrow-band model. Based on this model, the influence of the combined speed on the flow field and the infrared radiation of ship exhaust plumes were analyzed. According to the simulated result, the combined speed has an obvious influence on the shape and distributing area of the exhaust plumes. In addition, when the combined speed increased, the average radiation intensity of ship exhaust plumes decreased about 48.1 percent in the mid-wavelength infrared range. The physical factors for the error of the simulation model are discussed preliminarily.The carbon particles caused by the incomplete combustion have a significant impact on the plumes' infrared radiation transmission.