Vortex Generator for Drag Reduction in Hatchback Vehicles

Abstract

Any physical body being propelled through the air has drag associated with it. In aerodynamics, drag is defining as the force that opposes forward motion trough the atmosphere and is parallel to the direction of the free-stream velocity of the airflow. Drag must be overcome by thrust in order to achieve forward motion. Drag is generated by motion of air particles over the aircraft. A vortex generator is an aerodynamic surface, consisting of a small vane or bump that creates a vortex. Vortex generator can be found on many devices, but the term is most often used in aircraft design vortex generators delay flow separation; they improve the effectiveness of control surface. The boundary layer normally thickness as it moves along the car surface , reducing the effectiveness of trailing-edge control surfaces, vortex generators can be used to remedy this problem, among others, by “re-energizing the boundary layer”. The goal of project is to delay flow separation on the downstream side of the roof of car on account of decreasing pressure difference between the upstream and downstream side by creating vortex at the rear end of the car roof.
Keywords— Drag force; boundary layer