CFD simulations of AdBlue spray in an exhaust pipe
Examensarbete på kandidatnivå
Please use this identifier to cite or link to this item:
There are no files associated with this item.
|Type: ||Examensarbete på kandidatnivå|
|Title: ||CFD simulations of AdBlue spray in an exhaust pipe|
|Authors: ||Nilsson, Fanny|
|Abstract: ||AdBlue systems treat exhaust gases from combustion engines. It utilises a urea spray and a catalyst
in an exhaust pipe to reduce NOx emissions. The type of catalyst in this case is a Selective Catalytic
Reduction, SCR. Development of these systems is of importance to the automotive industry with
the continuously tightened emission standards. The development of the AdBlue systems often uses
Computational Fluid Dynamics, CFD, to deal with the turbulent and multi-phase flow, however
these are in many cases computationally expensive.
The thesis deals with developing a CFD model that is reliable while still being computationally
affordable. The simulation was made in the part of an exhaust pipe where the AdBlue was injected
and the SCR catalyst was not accounted for. AdBlue was represented by water in the simulation.
A Reynolds-Averaged Navier-Stokes solution, RANS, was used for the carrier phase, with a k "
turbulence model. The relevance of other fluid dynamic models were also investigated and selected
accordingly. For further evaluation of the droplet dynamics, a parametric study was made to
investigate how the droplets are affected by different injection velocities and angles of injection.
The CFD model was evaluated with regards to the theory and is considered reliable. Another
conclusion is that a higher injection velocity results in a smaller mean droplet diameter and a
smaller injection angle results in a wider droplet position distribution.|
|Issue Date: ||2019|
|Publisher: ||Chalmers tekniska högskola / Institutionen för mekanik och maritima vetenskaper|
|Series/Report no.: ||2019:01|
|Collection:||Examensarbeten för kandidatexamen // Bachelor Theses|
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.