Prediction of Generator Performance and Aerodynamic Heating of Reentry Vehicle Equipped with On-board Surface Hall Type MHD Generator

摘要

The generator performance and the aerodynamic heating of a reentry body equipped with an on-board surface MHD power generator are numerically examined with different anode electrode configurations (shape and position) when the position and the shape of a cathode electrode are fixed. An axisymmetric two-dimensional body with a nose radius of 1.35 m is assumed to be equipped with a pair of the anode and the cathode electrodes on the wall surface, and also the anode electrode is placed to the stagnation point side and the cathode electrode is placed to the shoulder side. The flight velocity is about 5.6 km/s, the flight altitude is about 60 km, and the maximum value of an applied dipole magnetic field is 0.5 T.Numerical results demonstrate that the on-board surface Hall type MHD power generator can effectively mitigate the wall heat flux at the stagnation point as well as extract the electric power output exceeding one megawatt, if a ring-shaped anode electrode is placed away from the stagnation point. On the other hand, if a bowl shaped anode electrode is placed to cover a wide wall surface including the stagnation point, the wall heat flux at the stagnation point cannot be effectively mitigated by the MHD interaction although the electrical output power exceeding one megawatt can be obtained. This is because the bowl shaped anode electrode reduces the Hall electric field in a wide region around the stagnation point.