# Numerical simulation of bio-diesel engine combustion and emission

 Author: Shang, Longji Title: Numerical simulation of bio-diesel engine combustion and emission Degree: M.Sc. Year: 2016 Subject: Biomass energy.Internal combustion engines -- Combustion -- Mathematical models.Hong Kong Polytechnic University -- Dissertations Department: Dept. of Mechanical Engineering Pages: xiii, 84 pages : color illustrations InnoPac Record: http://library.polyu.edu.hk/record=b2910925 URI: http://theses.lib.polyu.edu.hk/handle/200/8590 Abstract: Energy security and environment protection have been the serious problems to the contemporary world. It has been an increasing interest in researching the energy operation process especially for the combustion process of internal combustion (IC) engines, which consume a large portion of fuels and produce the proportionally large amount of pollutions. The method of numerical simulation can effectively predict the complete performance of an IC-engine and partly replace some engine experiments. Various parametric studies can be done by using numerical simulation method without the time and space limitation can guide the designs of engines with new combustion system and optimize the performance of the engines. It can also forecast the power and emissions of the engine with various fuels. Therefore the method of numerical simulation is very powerful and has many advantages in IC-engine study. KIVA-3V, a multidimensional CFD package originally developed by U.S Los Alamos National Laboratory, is used as the simulation tool in this study. Based on KIVA-3V, the operation process of an opposed-piston two-stroke diesel engine with inflow ports and outflow ports is simulated. The effect of different inflow tangential angles on the in-cylinder air motion is discussed in this study. The detailed combustion results calculated by KIVA-3V are compared with the experimental data. The comparison of combustion and emission characteristics between engines with tangential angles equal to 0° and 20° is also shown in this study. An alternative fuel, bio-diesel, has been added to the fuel library of KIVA-3V. The physical properties of methyl oleate (C₁₉H₃₆O₂) are used to approximate those of bio-diesel. By comparing the numerical simulation of bio-diesel and conventional diesel, it is found that bio-diesel has a better performance on emission at the expense of lower in-cylinder temperature and pressure.

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