MAGNETOHYDRODYNAMIC EFFECTS ON SUPERORBITAL RE-ENTRY VEHICLES.
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OHIO SCHOOL OF ENGINEERING
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The application of a magnetic field to a lifting reentry vehicle wil change the stagnation point heat flux and will increase the drag over the nose. In addition, a vehicle weight increase is usually associated with the addition of the field generating equipment. A computer program was written to analyze these effects. At each point in the re-entry trajectory, the program calculates the optimum magnetic field which will minimize the heat flux. The heat flux to the stagnation point is computed using either the optimum magnetic field or a field of one Webersq m, whichever is smaller. A study was performed on the Sortie vehicle assuming a re-entry velocity of 35,000 ftsec. The optimum field was always greater than one Webersq m. The influence of MHD on the maximum wall temperature was greatest at the minimum re-entry angle 10 decrease. For given conditions there is a critical weight increase for the vehicle at which the maximum wall temperature with MHD and the additional weight is equal to the maximum wall temperature without MHD and at the original weight. Results of this study indicate that MHD effects are in general small, and are significant only on vehicles with weightlift coefficientreference area100 lbsq ft. Author