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Supersonic aerodynamics of a projectile with slot cavities

Published online by Cambridge University Press:  03 February 2016

A. Ibrahim  and
A. Filippone
A. Ibrahim
Affiliation:
Department of Mechanical Engineering, Military Technical College, Cairo, Egypt
A. Filippone
Affiliation:
School of Mechanical, Aerospace and Civil Engineering, University of Manchester, Manchester, UK
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Abstract

This paper presents the results of experimental and computational investigations on the effect of slot cavities on a supersonic projectile. Experimental work was carried out to show the effects of the slots on the drag at Mach numbers M = 1·36, 1·65, 1·83. The computational analysis was done at M = 1·36. A single configuration of the slot pattern was used with two different slot widths (0·5mm and 2·0mm). Flow features were investigated in the slotted area and at the base. The analysis presented includes the pressure distribution, the supersonic cavity flow and the effect of the slots on the overall aerodynamic drag. Unlike the case of slots at transonic speeds, the suction and blowing mechanism is not found at supersonic Mach numbers. Streamwise cavity slots cause a small base drag reduction. The reduction in total drag is modest when the width is 0·5mm. However, the experiments showed that with the wider slots (2mm) the drag actually increases at Mach numbers from 1·36 to 1·83.

Type
Research Article
Information
The Aeronautical Journal , Volume 114 , Issue 1151 , January 2010 , pp. 15 - 24
Copyright
Copyright © Royal Aeronautical Society 2010 

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