Thermal-Fluid-Structure Coupled Analysis Of The Supersonic Conformal Dome

There are some special characters for conformal seeker, which could advance themissile speed, reduce the attacking time, and add the flying distance. Imaging qualityof conformal dome within aerodynamic pressure load and thermal load circumstancemust be fulfilled, when it is flying in supersonic speed. Nowadays, the proof test isalways from the wind tunnel experiments in China, which will spend so much moneyand time, and at the same time, that is not useful for the seeker designing. So, it is theaim for the article to find a manner which could simulate the course of the windtunnel experiment.Based on the above issue, there are four parts for the research in the article as thefollowing illustration:At first, the thermal-fluid-structure finite element analysis calculation method wasgotten for the conformal dome according to the fluid, thermal and structure principleknowledge. Then, the simulation platform was created by software, which couldrealize the entire course, in which the important technologies were resolved, forexample the aerodynamic load data transmission and thermal conductive coefficient.Secondly, the wind tunnel experiments were finished for the elliptical conformaldome with the draw ratio1:1, the diameter203mm, when the speed was defined by2.0Ma,2.5Ma and3.0Ma, and the attack angle was0°,20°,20°and30°. Meanwhile,the experiment results data were analyzed by comparing the simulation results fromFluent. The precision has reached to95%, which could define the parameters and the element type in simulation.Thirdly, based on the wind tunnel experiment results about the elliptical domewith diameter203mm, draw ratio1:1, attack angle0°and velocity in2.0Ma,2.5Maand3.0Ma, the pressure load was obtained on the surface of dome. The displacementdistribution and the stress distribution of the hot-press MgF2dome were obtained bythe fluid-structure coupled analysis on the finite element model created based ondifferent thickness. Then according to the data, the figure curves of these domemodels were created renewedly. Imaging quality was compared based on the opticalsystem designed. The results illuminated: the maximum stress was37.5MPa whenthe thickness of the dome was2mm, and the velocity was3.0Ma. At the same time,by contrast with the initial optics with the dome, the relative error of spot radius was0.26%, and figure relative error was-1.03%. The Sapphire dome and the ZnS domeanalysis were compared with the MgF2dome. And the results proved that the differentmaterials are fulfilled for the same circumstance.At last, the joining structure for a seeker with conformal dome was optimizedbased on the thermal-fluid-structure coupled analysis. The results illuminated: themaximum stress for the MgF2dome was36MPa and the joining structure was275MPa when the attack angle was2mm, and the velocity was3.0Ma, which bothfulfilled the requirement of materials. The thickness reduced1.5mm could add thespace of the seeker house, which could advance the ability of the conformal seeker,and guidance the conformal seeker design.