Stability derivatives of a delta wing with straight leading edge in the Newtonian limit
This paper presents an analytical method to predict the aerodynamic stability derivatives of oscillating delta wings with straight leading edge. It uses the Ghosh similitude and the strip theory to obtain the expressions for stability derivatives in pitch and roll in the Newtonian limit. The prese...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
IJERA
2013
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/49939/ http://irep.iium.edu.my/49939/ http://irep.iium.edu.my/49939/1/G43023238-paper9.pdf |
| Summary: | This paper presents an analytical method to predict the aerodynamic stability derivatives of oscillating delta
wings with straight leading edge. It uses the Ghosh similitude and the strip theory to obtain the expressions for
stability derivatives in pitch and roll in the Newtonian limit. The present theory gives a quick and approximate
method to estimate the stability derivatives which is very essential at the design stage. They are applicable for
wings of arbitrary plan form shape at high angles of attack provided the shock wave is attached to the leading
edge of the wing. The expressions derived for stability derivatives become exact in the Newtonian limit. The
stiffness derivative and damping derivative in pitch and roll are dependent on the geometric parameter of the
wing. It is found that stiffness derivative linearly varies with the pivot position. In the case of damping
derivative since expressions for these derivatives are non-linear and the same is reflected in the results. Roll
damping derivative also varies linearly with respect to the angle of attack. When the variation of roll damping
derivative was considered, it is found it also, varies linearly with angle of attack for given sweep angle, but with
increase in sweep angle there is continuous decrease in the magnitude of the roll damping derivative however,
the values differ for different values in sweep angle and the same is reflected in the result when it was studied
with respect to sweep angle. From the results it is found that one can arrive at the optimum value of the angle of
attack sweep angle which will give the best performance. |
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