Volumetric efficiency appraisal and cold flow study of formulae student vehicle

Abstract

This study pesents volumetric efficiency (v) as a measure of breathing capacity of internal combustion engine(ICE). The combustion characteristic is highly dependent on the of ICE. This study supports redesigning andenhancing the power output in the presence of restrictor fitted just downstream of throttle for the student designedFormula type vehicle. Considering the constraints laid by the Formula SAE, the design has been implemented in studentdesigned formula vehicle. The study has been performed on single cylinder 499cc Spark Ignited (SI)engine. In this work,the new intake geometry has been examined in order to estimate theƞv. It also shows the effect of plenum volume on the in-cylinder flow field using computational fluid dynamic (CFD) solver. The computation has been carried out with thecompressible Navier-stokes andEnergy equations in combinationwith the standardk-εmodel. The result discusses the in-cylinder flow field variation with different engine speeds. Also the plenum effect on the breathing capat of engineduring initial80ᵒcrank rotation in its 240ᵒsuction path, at different engine speeds has been carried out. It was observedthat the volumetric efficiency calculated with the Reynolds Average Navier Stokes (RANS) approach of new intake designcomes out in range of 85 to 90%.