COMPUTATIONAL FLUID DYNAMICS ANALYSIS OF FLOW AND COMBUSTION OF A DIESEL ENGINE

Year 2018, , 1878 - 1895, 20.12.2017

Mahmut Abay

https://doi.org/10.18186/journal-of-thermal-engineering.388333

Cited By: 11

Abstract

Efficient usage of fossil fuels
and reduction of CO₂ emissions are very important priorities for the
automotive industry. Without increasing contributions from diesel engines and
newer diesel technologies, it would not be possible to successfully meet fuel
consumption and CO₂ emission reduction targets. Therefore, new
regulations and applications have been put into action to address exhaust gas
emission problems. Some exhaust gases have become prominent with regard to
strong effects, such as NO_x and soot. NO_x contributes to
acid rain, which has deteriorating effects on the ozone layer. In this study,
flow and combustion characteristics of a diesel engine are investigated by
using Computational Fluid Dynamics (CFD). Whole engine components are modeled
and analyses are performed for entire speed range of the engine. Calculated
crank angle dependent pressure and temperature values are used as boundary
condition for reactive 3D CFD simulations. Reactive CFD simulations are
performed with 45° sector geometry for the period that both valves are closed.
In reactive simulations, RNG k-ε and Standard k- ε models are used to
characterize turbulence flow field. A lagrangian approach is used for two-phase
flow computations to simulate the liquid fuel injection. Commercially available
CFD code called Forte Reaction Design and its sub-module Chemkin are used for
three dimensional reactive simulations, moving grid generation and problem
setup. Predicted in-cylinder pressure and apparent heat release rate are
validated with experimental results. NO_x and Soot formations as a
result of combustion process are also investigated. Optimum level of NO_x
and Soot formation obtained with 8.5% EGR usage.

Keywords

Diesel Engine, Computational Fluid Dynamics, Exhaust Gas Recirculation, NOx, Soot

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