3D-CFD simulations of in-cylinder combustion kinetics for a diesel engine

• Main Authors: Cun-Yan Zhou Huang, 周黃存彥
• Other Authors: Kuang C. Lin
• Format: Others
• Language: en_US
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/nm93nn

碩士 === 國立中山大學 === 機械與機電工程學系研究所 === 106 === This study proposes 3D computational fluid dynamics (CFD) model that analyzes the relationship between rate of production, contour and mass-average concentration history in diesel engine combustion. A 45-degree sector engine model and n-heptane-NOx mechanism are used to predict the diesel engine combustion. The n-heptane-NOx mechanism that combines a n-heptane mechanism and NOx submodel has 34 species and 64 reactions. The results are analyzed in three different injection moments: 30%, 60% and 90% of the total fuel mass injected respectively. The contours and rate of production (ROP) are analyzed with the corresponding mass-average concentration history. Fuel decomposition is observed after the fuel is injected into the combustion chamber in terms of mass-average concentration histories. Fuel propagation and generation of small hydrocarbon products are clearly seen in contour analyses. Besides, the reaction pathways explain the formation of chemical species. The results comprehensively describe the combustion details of in diesel engine.