Fluid-Thermal-Structure Coupled Analysis of Radome for Hypersonic Flight Vehicle

In this paper, the radome of 3/4 power series generatrix is taken as the object of study, and fluid-thermal-structure coupling field of it is simulated and analyzed with sequential coupling method. The aerodynamic load under Ma=6 flight condition is calculated using k ε − standard model. Then the finite element method is used to make structure thermal analysis and simulate the temperature field and strain field. The results show that the maximum thermal stress, strain and deformation of the structure always occur at the tip of the structure where the thermal expansion effect is obvious. The calculation results can provide an effective theoretical reference for the design of hypersonic vehicle structures and thermal protection systems. 1. Coupling Theory Separation method is widely used in calculation of multi-field coupling. And the direct solution is uniting the fluid domain, solid domain and coupling in the same control equations and solving all variables at the same time step. But this method will make the calculation load increased exponentially, mainly confined to two-dimensional coupling problem. At the same time, about data transfer, fluid-solid coupling analysis can be divided into two directions, one-way coupling and two-way coupling. And according to different order of solution, two-way coupling is divided into simultaneous solution method and sequential solution method. 2. Parameters Setting of Numerical Simulation 2.1. Geometric Model The radome of hypersonic vehicle consists of a cover body, a boot on the head and a ring connecting the radome and the vehicle body. Thereinto, the boot on the head avoids the damaging effect of raindrops on the radome when the vehicle is flying at high speed, and the ring connects the radome to the air vehicle body. This paper analyses some structural properties of the radome and Simplifies the connecting ring. The figure below shows the geometric model and some dimension parameters of the radome of 7mm thickness.