電磁ヒートシールドを用いた大気突入機のVSL解析

抄録

The electrodynamic heat shield is a new type of heat protection system for the atmospheric-entry vehicle, which utilizes the Lorentz force acting on the weakly ionized plasma flow inside the shock layer. We are developing the Viscous Shock Layer (VSL) analysis method for an electrodynamic heat shield for quick estimation of performance, including the effect on the reentry trajectory. In this study, we propose the chemical non-equilibrium VSL equations for the electrodynamic heat shield analysis and compare its result to CFD calculation and theoretical relationship. In proposed VSL equations, momentum and energy equations have additional terms, and species conservation equations have no change. Inside the shock layer, ionization reaction is occurred due to high temperature, and electrical conductivity is changed by the flow condition, such as altitude and flow velocity. VSL results in the case of several altitudes of reentry trajectory agree with CFD results on electrical conductivity estimation. And, the stagnation heat flux diminish rates also agree with the theoretical relationship based on the interaction parameter Q. Therefore, our VSL analysis method can estimate the effect of electrodynamic heat shield depending on the flow condition.