World Journal of Engineering Research and Technology

MD Rafiqur Rahman*

ABSTRACT

Accurate experimental methods for determining the drag and lift forces of the projectile is very important. The trajectory of a projectile through the air is affected both by gravity and by aerodynamic forces. The aerodynamic forces can conveniently be ignored in many situations, even when they are comparatively large. In this paper 37 mm hollow projectile is considered since it shows good performance characteristics and easy to handle. Here main emphasis was given to determine pressure coefficient, Drag coefficients, lift coefficient of the hollow projectiles at different angle of attack. To study the aerodynamic characteristics of the projectiles the experiment was conducted in an open circuit subsonic wind tunnel where uniform flow velocity is maintained across the flow direction. For the experiment varied angles of the attack mostly between 30? to 50? is considered with an interval of 5?. Here inclined manometer was used to find out the surface static pressure and then the pressure coefficient was determined from that. Finally, for the numerical scheme, the ANSYS Software was used to simulate the experiment. In this study, it was found that the drag and lift forces acting on the projectiles, both increases when the angle of attack increases.

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