Design and Analysis of a Car Rear Spoiler for Drag Reduction

Abstract

Aerodynamic characteristics of a Honda civic car 2009 are of significant interest in  reducing car-racing accidents due to wind loading and in reducing the fuel consumption. Even  though these vehicles typically have a more rigid chassis and a stiffer suspension to aid in high speed maneuverability, a spoiler can still be beneficial. One of the design goals of a spoiler is to  reduce drag and increase fuel efficiency. Many vehicles have a fairly steep downward angle  going from the rear edge of the roof down to the trunk or tail of the car. Reducing flow  separation decreases drag, which increases fuel economy; it also helps keep the rear window  clear because the air flows smoothly through the rear window.  In this thesis will focus on CFD-based lift and drag prediction on the car body after the  spoiler is mounted at the rear edge of the vehicle, a car rear spoiler is designed and modeled in  3D modeled software CREO by different models of spoilers (NACA 4412& NACA 6409) and  analysis done by ANSYS software at different speeds (70, 90 & 110km/hr).  In this thesis the CFD analysis to determine the lift force, drag force, mass flow rate, and  pressure drop.   3D modeled in parametric software CREO and analysis done in ANSYS.