Study on the effect of spike-aerodome model of slotted drainage on drag reduction and heat protection of hypersonic blunt body

Huge aerodynamic drag and severe aerodynamic heating are inevitable challenges for hypersonic vehicles. A novel drag reduction and thermal protection strategy based on the combination of spike-disk and channel is proposed. The hypersonic flow characteristics are studied numerically. The results show this new strategy further reduces the total resistance; but also provides good thermal protection. On this basis, the influence of the outlet angle of the nozzle on the flow characteristics and the performance of drag reduction and heat prevention is studied deeply. By decreasing the nozzle outlet angle and then increasing the number of nozzles, the resistance coefficient further decreases, while the Stanton number of the blunt-body decreases at first and then increases. In the range of research parameters, when the nozzle inlet angle is 60 °and the outlet angle is 15 °, compared with the single spike-disk model, the resistance coefficient of the Cd model is reduced by 26.7% and the Stanton number is reduced by 41.7%. The research results verify the feasibility of the new model's performance.