Abstract
Reduction of forebody drag in high speed flying vehicles such as rockets and missiles are of high research interest in the present time. In the present research, drag reduction obtained by using an intermediate aerodisk mounted sharp tip spike has been investigated using computational studies at Mach number of 2.0. The flowfield over a hemispherical blunt body with an intermediate aerodisk mounted sharp tip spike is investigated at zero degree angle of attack and the amount of drag reduction obtained is then compared with that of a conventional sharp tip spike mounted hemisphere. The presence of an intermediate aerodisk changes the flow physics and shock system over the blunt body. The change in the system of shock waves by mounting an intermediate aerodisk results in a higher percentage (20% higher) of drag reduction generated by the blunt spiked body moving at a supersonic speed of Mach 2.0. Use of intermediate aerodisk proves to be beneficial in terms of drag reduction for spike lengths ranging beyond the critical length.
Highlights
The study of spike mounted blunt body moving at highspeed has gained the interest of researchers since past couple of decades
The location for mounting the intermediate aerodisk is obtained from the computational result obtained for the case a hemispherical blunt body mounted with a conventional sharp tip spike of L/D=2.0
The flowfield and amount of drag reduction are found to remain unchanged on increasing the length of the sharp tip spike beyond the critical spike length
Summary
The study of spike mounted blunt body moving at highspeed has gained the interest of researchers since past couple of decades. The major advantage of adding a spike on a blunt body moving at supersonic speed is its ability to change the flow physics and thereby reduce the forebody drag [1]. As a consequence of formation of weaker oblique shock waves, the pressure level over the blunt body surface reduces This decrease in the pressure level thereby reduces the drag coefficient experienced by the blunt forebody. Previous researchers have already reported the reduction of drag force experienced by a blunt body moving at high speed by mounting of spike [2]. The recent review paper of Huang et al [3] gives a detailed list of different research carried out over spike mounted blunt bodies moving at high speed. With increasing the spike length up to a critical length, the amount of drag
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