Document Type : Primary Research paper
Assistant Professor, Department of Aeronautical Engineering Nehru Institute of Technology, Coimbatore
Assistant Professor, Department of Aeronautical Engineering Nehru Institute of Technology, Coimbatore.
A ball moving through air,
experiences aerodynamic drag force.
Dimpled balls fly farther than the nondimpled
balls due to reduction in drag.
Because, dimpled surface cause boundary
layer on upstream side of the ball to
transition from laminar to turbulent. The
turbulent boundary layer is able to remain
attached to the surface of ball much longer
than a laminar boundary layer and so creates
a narrower low-pressure wake and less
pressure drag. The reduction in pressure
drag causes the ball to travel farther. So that,
we have planned to analyse this dimpled
surface feature on other aerodynamic shapes
like airplane wings. In that, we are going to
take NACA 0015 symmetrical airfoil shape.
After fabrication we will test it and compare
it with NACA 0015 without dimples.
The information useful for solving
aerodynamic problems of aeronautical,
space and automobile applications are best
obtained rapidly, economically and
accurately by testing the scaled models in
wind tunnels. The dimpled texture we are
placing in a rectangular wing is arranged in
an order (linear and staggered pitch), and the
diameter of the texture is of about 0.4 inches
(10mm) and the depth is 0.04 inches (1mm),
where it should be in the accurate manner.
After fabrication, for testing process we are
using low-speed, open circuit, suction type
wind tunnel and test section is
300mm*300mm. The contraction ratio is 91
and the axial flow fan is driven by AC