Modeling Of Optical Radiative Characteristics Of Hypersonic Vehicle In The Atmospere

Hypersonic vehicle in near space,because of its high speed,and good mobility and so on,has a high military value.When hypersonic aircraft flying in near space,self-radiation,radiation from the shock layer,and reflect radiation from the sun and so on will cause complex optical radiation characteristics. Therefore,considering on the hypersonic attack and defense,research on the radiation characteristics of a hypersonic vehicle in near space is very important.Based on the background above, the paper mainly researches on the theoretical modeling and numerical simulation of infrared spectral radiation characteristics of typical hypersonic vehicle, and analysis of the infrared spectral radiation characteristics of the hypersonic vehicle in near space in the bands of 3-5μm and 8-12μm. The main contents include:1.Calculation of the surface temperature of vehicles with an engineering methodCalculate aerodynamic heating and transient skin surface temperature of a hypersonic vehicle with an engineering method. Validate the accuracy of the algorithm, and obtain the heat transfer of the wall and skin temperature distributions of the aircraft surface.2.Calculation of the radiative properties of high temperature air components.Extend the ability of the existing software called "the spectral radiative properties of high-temperature flow field", add NO molecules with electronic transition of 11,000 Egyptian Department when calculating the infrared radiation in the electronic transition, and extend the temperature from 3000K to 8000K when calculating the vibrational and rotational transitions of multiple atoms and molecules. Validate the above calculation, and then analysis the infrared spectral radiation characteristics of different air components in different temperatures.3.Simulation of the infrared spectral radiation characteristics of a hypersonic vehicle with the Backward Monte Carlo Method.With the skin temperature distribution and characteristics of infrared radiation of high temperature,develop the procedure of Backward Monte Carlo to calculate the infrared spectral characteristics of hypersonic vehicle. Calculate and analysis the effects of solar reflection and the radiation exchange between the typical structures of complex shape on the apparent radiation characteristics. Obtain the infrared spectral characteristics of hypersonic vehicle when flying in the bands of 3-5μm and 8-12μm.