Aerodynamic Drag Reduction in a Passenger Vehicle Using Vortex Generator with Varying Yaw Angles: Detailed Study
Emerging Trends in Engineering Research and Technology Vol. 1,
Page 106-117
Abstract
Large investments are aimed at minimizing power needed for propulsion i.e., new downsized engines with new aerodynamic devices for drag reduction. For passenger vehicles the aerodynamic drag force is the dominating resistance force at higher velocity. The vehicle body is often optimized for reducing the drag resistance. Vortex generators belong to the category of boundary layer manipulators. Their function is to reenergize an adverse pressure gradient boundary layer that is about to separate by transporting high momentum fluid from the outer part of the boundary layer down to the low momentum zone closer to the wall. In this experimental investigation, the variation of pressure coefficient, dynamic pressure, coefficient of lift and drag with and without vortex generators (VG) on the roof of a utility vehicle have been studied at varying yaw angles of VG. The yaw angles used are 10°, 15° and 20°. To measure the effect of altering the vehicle body, wind tunnel tests have been performed with 1:15 scaled model of the utility vehicle with velocities of 2.42, 3.7, 5.42 and 7.14m/s. The experiments showed that a great improvement of the aerodynamic drag force reduction can be achieved with vortex generator.
Keywords:
- Passenger vehicle
- aerodynamics
- vortex generator
- pressure coefficient
- dynamic pressure
- boundary layer
- wind tunnel
- yaw angle
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