EFFECTS OF SPOILER ON AERODYNAMIC ANALYSIS FOR PROTON PERSONA BY EXPERIMENTAL

Abstract

Aerodynamic analysis for automotive plays an important role in analyzing the performance of cars. The main purpose of this project is to determine the drag coefficient of Proton Persona scale car model of by the installation of spoiler at suitable height. The model car and spoiler were designed with a downscaled dimension of 1:15 using Solidwork software, and fabrication process was done using Jelutong timber (wood). Three different heights of spoiler, at 14 mm, 20 mm and 25 mm were tested at the rear end of the model car. Experiment was carried out in Subsonic Wind Tunnel for model without spoiler and with spoiler at three different heights. For both experiments, the model was tested at 5 speeds, namely at 10 m/s, 15 m/s, 20 m/s, 25 m/s and 28 m/s. Based on the result, the percentage of drag reduction was then calculated when spoiler was used. The most reduction in drag coefficient was when utilizing 20 mm spoiler height with 10.93 % drag compared with no spoiler used. Keywords : Aerodynamic; Drag Coefficient; Drag Force; Spoiler; Subsonic Wind Tunnel