Drag Coefficient Determination of a Bus Model Using Reynolds Number Independence

Journal Title: International Journal of Automotive Engineering and Technologies - Year 2015, Vol 4, Issue 3

Abstract

Full-scale wind tunnel tests require too much time and cost to determine drag coefficients of vehicles. In this study, drag coefficient of a blunt bus model was tried to be determined using Reynolds number independence. A low speed wind tunnel having a free flow velocity is 28 m/s and has a rectangular cross section of 292 mm high and 292 mm wide, was used in experiments. The flow around the bus model was simulated with ANSYS CFX at wind tunnel conditions. As a result, aerodynamic drag coefficient of the bus model was determined as 0,66 and 0,65 according to results of CFX and experiment respectively after Reynolds number 57000. It is determined that the drag coefficient of the blunt vehicles can be determined by using low speed wind tunnel and Reynolds number independence.

Authors and Affiliations

Hamit Solmaz*| Gazi University, Faculty of Technology, Automotive Engineering Department, Ankara, Turkey, Yakup İçingür| Gazi University, Faculty of Technology, Automotive Engineering Department, Ankara, Turkey

Keywords

Experimental investigation of isopropyl alcohol (IPA) /diesel blends in a diesel engine for improved exhaust emissions

This study focuses on the effect of blending isopropyl alcohol (IPA) and diesel fuel with conventional diesel. The effect of isopropyl alcohol on a diesel engine was examined experimentally in a three-cylinder direct inj...

Investigations on Performance and Emissions of a Stationary DI Diesel Engine with Different Exhaust Gas Recirculation Temperatures

This paper addresses the application of Exhaust Gas Recirculation (EGR) for reduced oxides of nitrogen (NOx) emissions from naturally aspirated direct injection stationary diesel engine. Prevailing and future emission no...