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Hypersonic flow past non-slender wedges, cones and ogives in oscillation

Published online by Cambridge University Press:  04 July 2016

Kunal Ghosh ,
M. Vempati  and
D. Das
Kunal Ghosh
Affiliation:
Department of Aeronautical Engineering, Indian Institute of Technology, Kanpur, India
M. Vempati
Affiliation:
Department of Aeronautical Engineering, Indian Institute of Technology, Kanpur, India
D. Das
Affiliation:
Department of Aeronautical Engineering, Indian Institute of Technology, Kanpur, India
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Summary

Ghosh’s large-deflection hypersonic similitude and consequent plane and conico-annular piston theories have been applied to obtain unsteady pressure and the pitching moment derivatives for oscillating non-slender wedges, cones and ogives. The plane piston theory for a wedge is extended from a quasi-steady analysis, which gives the moment derivative due to pitch rate Cmq, to an unsteady analysis; the two analyses combine to give the moment derivative due to incidence rate , which is shown here to be the same for wedges and quasi-wedges. The present theory can separately give Cmq and for a quasiwedge of arbitrary shape; this principle is illustrated for a particular quasi-wedge namely the parabolic arc plane ogive. In comparison, a previous theory by Hui gave only the sum of Cmq and , only for wedges. The conico-annular piston theory is employed to obtain Cmθ, which is the moment derivative due to a steady pitch angle, and Cmq for non-slender cones and axisymmetric ogives in closed form for the first time.

Type
Research Article
Information
The Aeronautical Journal , Volume 89 , Issue 887 , September 1985 , pp. 247 - 256
Copyright
Copyright © Royal Aeronautical Society 1985 

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