Drag Reduction for Spike Attached to Blunt-Nosed Body at Mach 6

摘要

A high-speed flow over a blunt body generates a bow shock wave in front of it, which causes a rather high surface pressurernand, as a result, high aerodynamic drag. The surface pressure on the blunt body can be substantially reduced if a conical shock wave is generated by attaching a forward-facing spike. Thus, the introduction of the spike decreases the drag and increases the lift coefficient. The spike produces a region of recirculating separated flow that shields the blunt-nosed body from the incoming flow. The applicability of the spike is limited due to the possible appearance of flow oscillations in the separation region, which may reduce its positive effects and may cause aerodynamic disturbances during the flight [1].