The Effect of Intake Manifolds On Cylinder-To-Cylinder Variations of Performance and Emissions of A Four-Cylinder Engine
Journal
Journal of the Chinese Institute of Engineers,Series A/Chung-kuo Kung Ch'eng Hsuch K'an
Journal Volume
14
Journal Issue
1
Pages
21-28
Date Issued
1991
Author(s)
Abstract
Abstract This paper deals with the influences of unequal length and unequal diameter of intake pipes on the cylinder‐to‐cylinder variation of volumetric efficiency, NO emission, CO emission, and other typical simulation results of engine performance. It is found from the present study that, due to the water‐hammer effect, the cylinder with the longer intake pipe has a higher volumetric efficiency than that with the shorter pipe. The phenomenon is especially evident at high engine speed. In addition, the decrease of the intake pipe diameter has an effect which is similar to that of the increase of the intake pipe length, but the inertia of the inlet mixture is reduced by the pipe wall friction at high engine speed. Shortening the intake pipe length of one of the cylinders has an effect on the engine performance and emissions which is similar to the effect of increasing the intake pipe length of the other cylinder. At low rpm, NO emission is inversely proportional to the volumetric efficiency because of the interaction of cylinder pressure. At high rpm, instead of the cylinder pressure, the cylinder temperature becomes the dominate factor and causes a drastic drop in NO. The cylinder‐to‐cylinder variation of CO emission with respect to the intake system dimensions is not significant. Notes Correspondence addressee
SDGs
Type
journal article