Experimental and computational analysis of the pressure distribution on different models of car body in the wind tunnel

Abstract

The aerodynamic characteristics of the conventional passenger cars are newlinefocused in this present research work. Computational and experimental newlinestudies were carried out to obtain aerodynamic characteristics of three chosen newlinecar models with three drag reduction devices. The drag reduction techniques newlineare rear spoiler, vortex generators and base bleed are used as add on devices newlineon the car models .The add on devices are expected to reduce aerodynamic newlinedrag on the car which is an important parameters of the car. The reduction of newlinethe drag will reduce the fuel consumption, increased acceleration capability newlineincreased top speed.The geometric similarity with scale of 1:10 is maintained in the newlinefabrication of car models with Aluminum alloy car model 1 (Wagon R), car newlinemodel 2(Swift) and car model 3(Alto). The add on devices are also with 1:10 newlinegeometric similarity scale ratio used for the fabrication.Surface pressure ports are made along the centre line with 29 ports in the middle span of the car model. The wind tunnel with test section size of newline90cm x 120cm x180cm along with 64 channel pressure scanner used for the newlineexperimental studies.the surface pressure are measured and using Bernouli s newlineequation to calculate the mean pressure coefficient on the car models newlineThe wind tunnel test section velocity varied in steps of 4m/s from 4m/s newlineto 20m/s to carry out the experiments. The mean pressure coefficients are newlineresolved in the direction of flow to compute the drag coefficient of the car newlinemodels. The obtained drag coefficients of the car models with the add on newlinedevices compared. newline newline