The Analysis About Aerodynamic Performance And Structural Performance Of Tapered Radome

Aerodynamic heating is one of the key issues of the supersonic aircraft research. Thepurpose of this paper is, using numerical simulation method to calculate the temperature fieldof the tapered radome at different Mach numbers in different time, analyzing the influence ofmaterials properties(such as density, heat conduction coefficient and specific heat capacity) ontemperature distribution of the radome by means of comparison. The research provides thehelp for supersonic radome materials selection and structure design.In this paper, the FLUENT software is used to simulate the slipstream circle flow of2Dcircular cylinder, the pressure distribution, temperature distribution and heat flow densitydistribution data are obtained, then numerical simulation results are compared to beconformed to those results of experiment.In both2.5and2.8Mach number, by using unsteady calculation method to calculateheating rule of zero Angle of attack flight aerodynamic heating rule. At74seconds, thehighest temperatures of2.5Ma and2.8Ma radome outer wall surface are398.34°C and493.89°C.There are four kinds of material of radomes, after the numerical simulation, thetemperatures inside wall surface of four kinds of radomes are362.43°C,27.09°C,373.03°Cand389.06°C.It shows that, in the forth material of radome, temperature travelfastest, and in the second material of radome, temperature travel slowest. The calculatedresults show that, the material of small heat transfer coefficient, large density, and largespecific heat capacity is the best thermal protection material.Building and meshing a model of radome in ANSYS software. Under pressure load, theradome is in compression stressed condition. The maximum stress and maximumdisplacement of2.8Ma radome are33.6MPaand0.525mm; the maximum stress andmaximum displacement of2.5Ma radome are26.8MPaand0.419mm. Under temperatureload, the exterior surface is in compression stressed condition, the inner surface is in tensilestressed condition. The maximum stress of the exterior surface are38.4MPaand31MPa;the maximum stress of the inner surface are65MPa and52.5MPa.It show that, the stress ofpressure load is lower than the stress of temperature load.