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Pressure measurements over a hemisphere-cylinder body attached with a forward facing spike

Published online by Cambridge University Press:  27 January 2016

R. Kalimuthu ,
R. C. Mehta  and
E. Rathakrishnan
R. Kalimuthu
Affiliation:
Vikram Sarabhai Space Centre, Trivandrum, India
R. C. Mehta*
Affiliation:
Noorul Islam University, Kumaracoil, Thacklay, India
E. Rathakrishnan
Affiliation:
Indian Institute of Technology, Kanpur, India
*
[email protected]
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Abstract

The present paper presents oil flow visualisations and pressure measurements over a hemisphere-cylinder body attached with a forward facing spike at Mach 6 and Reynolds number of 1·38 × 108 at 0° and 5° angle-of-attack. The oil flow pictures depict the separation region in the vicinity of the spike on the hemisphere-cylinder body. The oil flow visualisations will help to locate the reattachment shock wave on the hemisphere-cylinder body and also understand the flow field behavior on the blunt-nosed spike configuration. The pressure measurements over the hemisphere-cylinder body depend on the shape and the length of the spike. The pressure distributions over the blunt-nosed body show significant influence of the angle-of-attack. The maximum pressure coefficient on the hemisphere-cylinder body is a function of the spike length, shape of the aerodisk and angle-of-attack. The windward and leeward sides pressure variations show dependence of the geometrical parameters of the spike and shape of the spike. The hemisphere and the flat-faced aerodisk cause considerable reduction of pressure leading to decrease of aerodynamic drag compared to the conical spike.

Type
Research Article
Information
The Aeronautical Journal , Volume 117 , Issue 1192 , June 2013 , pp. 639 - 646
Copyright
Copyright © Royal Aeronautical Society 2013 

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