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在飞行过程中飞行器蒙皮会受到来自太阳辐射的加热作用,导致其红该辐射分布规律发生较大变化,为完善飞行器蒙皮红外辐射特征的计算分析方法,在综合考虑气动加热、发动机舱内流换热及尾喷流对后机身传热等因素的基础上建立了整机蒙皮温度场计算模型,给出了不同辐照角度下的量化太阳辐射热流,采用数值计算的方法研究了太阳辐射热流对蒙皮的加热效果,分析了不同辐照角度下蒙皮8~14μm波段全向红外辐射特征变化规律。研究结果表明:太阳辐射对机身蒙皮向阳面有明显的加热效果,蒙皮局部温度最高增加21K;太阳辐射作用能够显著增大向阳面蒙皮8~14μm波段的红外辐射强度,其中Ma=0.85时蒙皮全向红外辐射强度最高增大了18%,Ma=1.50时最高增大了12%;太阳辐射对蒙皮红外辐射的影响随着飞行Ma数的增大而降低,Ma数从0.85增大至1.50时,蒙皮全向红外辐射强度的增大比例降低了6%,降幅33%;此外不同的太阳辐照角度对蒙皮温度场及不同探测面的红外辐射强度分布影响也大不相同。
During the flight, the skin of the aircraft will be heated by the solar radiation, resulting in a great change in the distribution of its red radiation. In order to improve the calculation and analysis of the infrared radiation characteristics of the aircraft skin, taking into account the aerodynamic heating, Flow heat transfer and rear jet flow on the rear fuselage heat transfer and other factors based on the established skin temperature calculation model of the whole skin, given the radiation angle of different quantified solar radiation heat flow, using numerical methods to study Solar radiation heat flow on the skin of the heating effect, analysis of different irradiation angles skin 8 ~ 14μm band omnidirectional infrared radiation characteristics of the variation. The results show that the solar radiation has a significant heating effect on the sunken skin of the fuselage skin, and the maximum local temperature of the skin skin increases by 21K. The solar radiation can significantly increase the infrared radiation intensity of the sunlit skin in the range of 8-14μm, where Ma = 0.85, the maximum intensity of infrared radiation increases by 18% and the maximum increases by 12% when Ma = 1.50. The influence of solar radiation on the infrared radiation of the skin decreases with the increase of Ma number, 0.85 to 1.50, the proportion of the increase of infrared radiation intensity in skinning is reduced by 6% and 33% respectively. In addition, the influence of different solar radiation angles on the skin temperature field and infrared radiation intensity distribution of different detection surfaces is also Very different.