Diesel Engine Exhaust Manifold

Numerical Optimization of a Diesel Engine Exhaust Manifold


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. 


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.


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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