Aerodynamic Heating of Reentry Body Equipped with Onboard-Surface Hall Magnetohydrodynamic Generator

摘要

The generator performance and the aerodynamic heating of a reentry body equipped with an onboard-surfacenHall-type magnetohydrodynamic power generator are examined under some different anode electrodenconfiguration cases by means of two-dimensional numerical simulation. The reentry body with a nose radius ofn1.35 m has a pair of electrodes on the wall surface. Flight altitude and velocity are set to 60 km and 5:6 = ,nrespectively. The strength of an applied magnetic field is about 0.5 T. Numerical results demonstrate that thenonboard-surface Hall-type magnetohydrodynamic power generator can effectively mitigate the wall heat flux at thenstagnation point aswell as extract the electrical power exceeding 1MWwhen a ring-shaped anode electrode is placednon the wall surface away fromthe stagnation point. On the other hand, if a bowl-shaped anode electrode is placed toncover a wide wall surface including the stagnation point, an effectivemitigation of the wall heat flux at the stagnationnpoint by the magnetohydrodynamic interaction becomes impossible, although the electrical power exceeding 1MWncan be obtained. This is because a Hall electric field, strong enough to induce the strong magnetohydrodynamicninteraction, cannot be obtained near the stagnation point, due to the electrically coupled circuit between the plasmanand the bowl-shaped anode electrode.