NUMERICAL ANALYSIS OF DRAG ON BLUNT BODIES WITH THE USE OF DIFFERENT CONICAL SPIKES AT SUPERSONIC SPEED

Abstract

Aerospace vehicles such as re-entry vehicles, satellite launching vehicles, missiles, rockets move at very greater speed with variations in properties around the flow pattern. Greater amount of heat and drag are associated with these vehicles. Different spikes, bleeding devices, trailing flatters have been designed to reduce drag formed on aero-vehicles due to pressure, wave, skin friction factors. In present study, the blunt body drag is computed numerically by using Spallart-allmaras turbulence model for different angle of attack i.e 0,2,4,8 degrees at supersonic speed of Mach number 2 and conical spiked blunt body for L/D ratio of 1, 1.5, 2 at zero angle of attack has been computed. The front facing conical spike reduces the strong bow shock at front part of blunt body by converting it into oblique shock and shifting the reattachment point for different L/D ratio.