Open AccessComputational fluid dynamic modelling of NOx formation in diesel engine
Author(s) -
S.S. Hoseini,
G. Najafi,
Barat Ghobadian,
H. Azimi-Nejadian,
Hossein Ahmadian
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/788/1/012067
Subject(s) - nox , diesel engine , soot , combustion , diesel fuel , computational fluid dynamics , homogeneous charge compression ignition , nitrogen oxide , automotive engineering , computer simulation , environmental science , mechanics , cylinder , materials science , nuclear engineering , combustion chamber , chemistry , mechanical engineering , engineering , physics , organic chemistry
The purpose of this study is offering a numerical model to predict the NOx formation of a diesel engine. For this purpose, simulation of combustion and emissions of a diesel engine was performed using CFD FIRE commercial software. The simulation was performed for the condition of 900 rpm for engine speed, 200 bar cylinder pressure, and injection timing (15° CA BTDC). The difference between the experimental and numerical results was reported by about 3.2%. The result of the numerical simulation shown due to the non-homogeneous mixture of air and fuel in a diesel engine, the temperature distribution is not uniform and the temperature in some places reaches 2500 K. In areas with an equilibrium ratio (stoichiometry) and temperatures above 2000 K, nitrogen oxide is the highest. Also, the result shown areas with a temperature range between 1500 and 1900 K are more favorable areas for the formation of soot pollutant.