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飞行器在大气层内高速飞行时,高速气体来流在飞行器顶端形成高温高压气体绕流,并对顶端光学探测窗口形成强烈气动加热,光学窗口温度急剧上升,高温气体和光学窗口的红外辐射对探测系统形成严重的气动热辐射效应,探测信噪比下降。针对非灰混合气体和光学窗口材料的辐射特点,采用介质辐射传输方法,模拟了钝锥球头外形头部且顶端安装探测窗口飞行器的气动热辐射,研究了气体和窗口热辐射随时间的发展及其与窗口材料的关系。结果表明,高温气体的热辐射与飞行器的运动状态关系密切,而光学窗口的热辐射随飞行时间增加而迅速增强,逐渐成为气动热辐射的主要因素,因此抑制光学窗口的温度上升速度和幅度是减弱气动热辐射的关键。
When the aircraft is flying at high speed in the atmosphere, high-speed gas flows around the top of the aircraft to generate high-temperature and high-pressure gas, and forms a strong aerodynamic heating on the top optical detection window. The temperature of the optical window rises sharply. Infrared radiation from the hot gases and the optical window, The formation of severe aerodynamic heat radiation effect, detection of signal to noise ratio decreased. Aiming at the radiation characteristics of non-gray mixture gas and optical window material, the radiative transfer method of medium was used to simulate the aerodynamic heat radiation of the probe with the blunt cone’s head and the top of the probe. The thermal radiation of the gas and the window was studied with the development of time And its relationship with the window material. The results show that the thermal radiation of the high temperature gas is closely related to the movement of the aircraft. However, the thermal radiation of the optical window rapidly increases with the increase of the flight time and gradually becomes the main factor of the aerodynamic heat radiation. Therefore, the temperature rise rate and amplitude of the suppression optical window are The key to attenuating aerodynamic heat radiation.