Breathing Blunt Nose for Drag Reduction at Hypersonic Speeds

摘要

A new concept termed Breathing Blunt Nose (BBN) was proposed by Rathakrishnan for drag reduction and heat dissipation at hypersonic flow regimes. In the BBN technique, flow is allowed to pass through a small hole in the nose of a blunt nosed body and made to come out through the base. Because of the relief offered by the breathing, the strength of the bow shock is reduced as the flow passes through the hole at the nose. This reduces the value of positive C_P at the nose. The high pressure flow, traversed by the shock at the nose is injected into the suction zone at the base. The high pressure flow discharged at the base reduces the suction, resulting increase of base pressure (decrease of negative C_P).