Estimation of stability derivatives for a planar wedge in the newtonian limit

Crasta, Asha and Khan, Sher Afghan (2014) Estimation of stability derivatives for a planar wedge in the newtonian limit. IOSR Journal of Mechanical and Civil Engineering (IOSR-JMCE, 10 (2 ). pp. 1-6. ISSN 2278-3008 (O), 2319-7676 (P)

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Abstract

The present work contains an analytical method derived using Ghosh’s Hypersonic similitude to predict the aerodynamic stability derivatives of a Planar Wedge in the Newtonian limit. It uses the strip theory developed by Ghosh’s where span wise strips are independent of each other, to obtain the expressions for stiffness and damping derivatives in pitch for a planar wedge in the Newtonian limit. The present theory predicts the stability derivatives of a planar wedge for a wide range of geometrical and flow parameters. The knowledge of these stability derivatives is essential to freeze and arrive at the geometrical as well as the kinematic similarity parameters before we go for exhaustive computations and experimental studies. The present method predicts the stability derivatives in pitch for a planar wedge with remarkable computational ease, which is very handy at the design stage. The expressions derived for stability derivatives become exact in the Newtonian limit. It is found that stiffness derivative linearly varies with the pivot position. It is also observed that the centre of pressure moves towards the trailing edge and this shift is quite high at high angles of attack. Hence, this behavior could be utilized to stabilize the aerospace vehicle from the static stability point of view. In the case of damping derivative since the expression for the damping derivative is non-linear and the same has been reflected in the results. However, the behavior remains linear till angle of attack fifteen degrees, later the trend is non-linear.

Item Type:	Article (Journal)
Additional Information:	7395/49931
Uncontrolled Keywords:	angle of incidence, Newtonian Limit, Strip theory, Planar wedge, pivot position
Subjects:	T Technology > TL Motor vehicles. Aeronautics. Astronautics > TL787 Astronautics
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Engineering > Department of Mechanical Engineering
Depositing User:	Prof. Dr. Sher Afghan Khan
Date Deposited:	11 Apr 2016 09:56
Last Modified:	20 Jun 2018 14:45
URI:	http://irep.iium.edu.my/id/eprint/49931

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