Diesel Engine Exhaust Manifold

Numerical Optimization of a Diesel Engine Exhaust Manifold


INTRODUCTION

Exhaust ManifoldAn exhaust manifold is a part of the internal engine that collects the exhaust gases from multiple cylinders into one pipe.  In internal combustion engines, exhaust gas recirculation (EGR) is a nitrogen oxide emissions reduction technique used in diesel engines. EGR works by recirculating a portion of an engine’s exhaust gas back to the engine cylinders. A typical exhaust manifold is shown in Figure 1. 


THE PROJECT

Velocity and pressure distribution of exhaust systemThe objective of this project is to find out the movement inside the exhaust manifold. A series of Computational Fluid Dynamics (CFD) simulations will be performed, and the results will provide a clear idea about the flow round the plenum chamber. In addition to the numerical evaluation of the airflow through the intake manifold, a movie will be provided to show the animated movement.


THE RESULTS

Mass flow rate at outletsBy analyzing the simulation results, the following conclusions were drawn: the pressure drop across runners was non-uniform. Due to a sharp bend at the region of the EGR outlet and the plenum wherein the flow does not smoothly enter the EGR outlet, there is a drop in velocity at the EGR outlet. Additionally, it is shown that the outlets operated alternately. 


Sponsor: LHP Software Solutions

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