CAJ | 학술논문

以红外成像制导技术在高速拦截器上的应用需求为背景,进行了光学头罩绕流流场气动光学效应数值模拟.应用雷诺平均NS方程并选取了适当的湍流模型,对凹窗、凸窗和球头3种光学头罩的高速飞行器绕流流场进行了数值模拟,得到了绕流流场密度分布;研究了脉动流场引起的气动光学传输效应的计算方法,应用几何光学、物理光学和统计光学方法进行了光学传输效应计算,得到了点扩散函数,即像面光强分布.通过瞄视误差、Strehl比、含能半径等气动光学效应参数描述了流场引起的成像畸变,并分析了不同外形、飞行状态和光学系统参数对光学传输效应的影响.
이홍외성상제도기술재고속란절기상적응용수구위배경,진행료광학두조요류류장기동광학효응수치모의.응용뢰낙평균NS방정병선취료괄당적단류모형,대요창、철창화구두3충광학두조적고속비행기요류류장진행료수치모의,득도료요류류장밀도분포;연구료맥동류장인기적기동광학전수효응적계산방법,응용궤하광학、물리광학화통계광학방법진행료광학전수효응계산,득도료점확산함수,즉상면광강분포.통과묘시오차、Strehl비、함능반경등기동광학효응삼수묘술료류장인기적성상기변,병분석료불동외형、비행상태화광학계통삼수대광학전수효응적영향.
Based on the demand of applying infrared imaging guidance system to the high speed interceptor,the aero-optical effects in the flow fields around the optical window of the high speed interceptor were simulated numerically.The density distribution of flow fields around three typical optical windows,including cavity window,raised window and sphere window,were calculated by adopting the Reynolds averaged Navier-Stokes equations with the proper turbulence model.The method to calculate the aero-optical transmission effects caused by the fluctuating flow field was discussed.The optical transmission effects were calculated using the ray tracing method,Fourier optics and statistics optics.The point spread function,which was the distribution of light intensity on the image plane,was obtained.The parameters of the optical transmission effects were presented to describe the image aberrations,such as theboresight error,Strehl ratio,and the contain energy radius.The influence of the window shape,flight state and the parameters of the optical system on the optical transmission effect were also discussed.