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Effect of ring size on the side force over ogive-cylinder body at subsonic speed

Published online by Cambridge University Press:  03 June 2016

P. Kumar  and
J.K. Prasad
P. Kumar*
Affiliation:
Department of Space Engineering and Rocketry, Birla Institute of Technology, Mesra, Ranchi, Jharkhand, India
J.K. Prasad
Affiliation:
Department of Space Engineering and Rocketry, Birla Institute of Technology, Mesra, Ranchi, Jharkhand, India
*
[email protected]
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Abstract

Experiments and computations have been made to obtain the details of the flow field over a slender body at high angles of attack at a freestream velocity of 17 m/s corresponding to a Reynolds number of 2.9×104 based on the base diameter. Experiments indicated that the existence of side force at higher angles of attack is mainly due to the presence of asymmetric vortices in the leeward side. A rectangular cross-section circular ring placed at an axial distance of 3.5 times the base diameter reduced the side force at all the angles of attack. Investigations were made to obtain the effect of the height of the ring at an angle-of-attack of 50° where the side force experienced is relatively large. A ring placed at a distance of 3.5 times the base diameter alters the initial vortices and hence helps in substantial reduction of the side force. Studies with rings of different heights indicate that a ring having a height of 3% of the local diameter reduced the side force at almost all the angles of attack for the present flow conditions and provided the least disturbance to the lift and drag of the body.

Keywords

slender bodyasymmetric vortexcircular ringfluentside force
Type
Research Article
Information
The Aeronautical Journal , Volume 120 , Issue 1231 , September 2016 , pp. 1487 - 1506
Copyright
Copyright © Royal Aeronautical Society 2016 

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