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Base Drag Reduction by External Burning.
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Supersonic combustion in the inviscid stream has been shown to reduce the base drag on a projectile. Fast reacting fuel burned externally in the inviscid, supersonic flow generates compression waves, which, when properly originated, impinge on the recirculation bubble aft of the projectile base and increase the base pressure. A free-jet wind tunnel was constructed to study external burning where heat addition was simulated by nozzle contour. Sufficient increase in base pressure was attained to not only reduce base drag but also provide thrust. Thus, external burning provides a method for increasing the performance of projectiles. Author
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