Influence of Ablation Products of Aircraft Pyrolytic Carbonized Material on Plasma Flow Field

doi:10.12382/bgxb.2021.0161

Abstract

Abstract: The heat-resistant material on the surface of high-speed aircraft will decompose and ablate at the high temperature generated by aerodynamic heating. After entering the flow field，the ablation products react with the high-temperature air in the flow field， thus affecting the component concentration and plasma distribution in the air flow field around the aircraft. Based on solving the thermochemical non-equilibrium Navier-Stokes equations，a three-dimensional plasma flow field calculation method coupling the ablated wall surface is established. The plasma flow field of RAMC-II is predicted and compared with the flight test data to verify the reliability of the proposed method. The influence of material ablation on plasma flow field of lifting body aircraft is analyzed. The results show that the electron density in the flow field on the head of the aircraft is the highest， the electron density in the body area is reduced by two or three orders of magnitude，and NO⁺ and N⁺ contribute most to the electron number density in the flow field. The ablation products injected into the flow field increase the separation distance of shock wave and the thickness of plasma layer. With the development of the flow downstream，the ablation rate of the aircraft body decreases， but the influence range of ablation products on the plasma flow field becomes larger， and the electron number density of the body flow field increases to a certain extent.With the increase in Mach number， the ablation rate of wall increases， and the influence of ablation products is more obvious. The peak electron density on stagnation line changes little， but the electron number density on symmetrical surface of body increases significantly. For the same kind of ablative materials with different components， the influences of ablated products of different materials entering into the flow field on the shock wave separation distance and the peak electron number density are different.

Key words: plasmaflowfield, pyrolyticcarbonizedmaterial, ablationproduct, electronnumberdensity

CLC Number:

O53
V411.7

NIE Chunsheng， YANG Guang， NIE Liang， ZHOU Yu， ZHAO Liang. Influence of Ablation Products of Aircraft Pyrolytic Carbonized Material on Plasma Flow Field[J]. Acta Armamentarii, 2022, 43(3): 513-523.

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