Aerodynamic Thermal-structure Coupling Analysis Of Optical Window

With the growing of modern air-defense missiles speed, the performance ofmodern air-defense missiles has gradually increased. As a result, the requirement ofguidance accuracy is becoming higher and higher. Infrared imaging guidance hasbecome the inevitable trend of modern air defense weapons development. As the speedincreases, the problem of aero-optical effects on the guidance precision arises.Aero-optical effects include: high-speed flow impact on optical transmission, shockwave and aero thermal radiation effects in the window and optical hood aerodynamicheating effects. Aero-optical effect has become the key constraining factor of theguidance accuracy in high-speed missiles. Researching the law of aerodynamic effects,will be conducive to the correction of the deviation caused by aero-optical effects and inthe mean time, to improve the high-speed missile guidance accuracy and itsanti-interference ability.The influence of aero-optical effects to the thermal-structure of the optical sidewindow is analyzed in this paper. Combining with ANSYS, a finite volume methodcalculation program of radiation transfer based on Fortran is used to solve the coupledradiation-conduction heat transfer problem of the side window. The impact of theradiation transfer in the side window to its temperature field is obtained. On this basis,an analysis software which can solve the heat-structural coupling analysis problem ofside window with different shapes in complex thermal boundary conditions underaerodynamic environment is made. The temperature and stress-strain field of the sidewindow are obtained under different boundary conditions. The change rule of therefractive index inside the medium is obtained using thermo-optic effect. Thetemperature response of the fairing in complex boundary condition is analyzed and theBackward Monte Carlo is applied to analyze the impact of the temperature field in thefairing to the energy which is detected by the probe. On the basis of the above work, theC#is applied to compile the calculation software for the side window in the condition ofaerodynamic environment in which the complicated and varying parameters can beinput in an intuitive user interface. The simulation software which can be used toanalyze the coupled radiation-conduction heat transfer problem of the side window for avariety of shapes in the very complex thermal boundary conditions is compiled.