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Title: Combustion Process and Emission Formation in Diesel Engines Fuelled by Biofuels and Blend Fuels
Authors: AN HUI
Keywords: Biodiesel, Combustion Modelling, Emissions, CFD, Blend Fuels, KIVA4
Issue Date: 30-Jul-2013
Source: AN HUI (2013-07-30). Combustion Process and Emission Formation in Diesel Engines Fuelled by Biofuels and Blend Fuels. ScholarBank@NUS Repository.
Abstract: In this dissertation, to better utilize biodiesel in modern diesel engines, efforts have been made on three different aspects associated with biodiesel combustion studies. First, a skeletal reaction mechanism consisting of 112 species and 498 reactions with CO, NOx and soot formation kinetics embedded was developed to simulate the combustion process of diesel, biodiesel and their blend fuels. Extensive validations were performed for the developed reaction mechanism and the results indicated that the predicted ignition delay timings of n-heptane and biodiesel agreed very well with experimental data. The reaction model was further integrated to a 3-D engine simulation software, KIVA4, to predict the performance of the engine with high accuracy. For a better representation of biodiesel fuel properties, a detailed physical properties predictive model was developed for the five typical methyl esters of biodiesel and was integrated into the KIVA4 fuel library. Second, experimental and numerical studies were conducted on a light duty diesel engine to investigate the impacts of biodiesel on the engine?s performance, combustion and emission characteristics. Key results revealed that one major drawback associated with biodiesel combustion was the reduced power output with higher CO emissions at partial load conditions due to increased viscosity of biodiesel. Finally, a detailed chemical reaction model was developed to study the impact of supplemental hydrogen induction on biodiesel combustion. Simulation results indicated that with supplementary hydrogen induction, a substantial increase in the peak cylinder pressure and heat release rate could be obtained under medium and high engine load conditions. In addition, a decreasing trend was observed for both CO and soot emissions under all the engine operating conditions.
Appears in Collections:Ph.D Theses (Open)

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