Analysis of the Effects of Different Underbody Exhaust Geometries in the Car Aerodynamics

Abstract

A flow discharge in the underbody car surface, usually necessary for the internal flow systems, represents a critical aspect. The effects of different shape of the discharge surfaces, both experimentally and numerically, are analysed. For all the considered aerodynamic quantities (drag, vertical load, balance) a importance of the exhaust geometry is evident. Furthermore, for some configurations, sensitivity to both the attitude and ride height is present. The high differences in the aerodynamic coefficients are essentially related to the separation of the flow, significantly different for the considered geometries, that occurs downstream the air intake exhaust.