Abstract
A 3-dimensional computational fluid dynamics modeling is conducted on a direct injection diesel engine fueled by biodiesel using multi-dimensional software KIVA4 coupled with CHEMKIN. To accurately predict the oxidation of saturated and unsaturated agents of the biodiesel fuel, a multicomponent advanced combustion model consisting of 69 species and 204 reactions combined with detailed oxidation pathways of methyl decenoate (C11H22O2), methyl-9-decenoate (C11H20O2) and n-heptane (C7H16) is employed in this work. In order to better represent the real fuel properties, the detailed chemical and thermo-physical properties of biodiesel such as vapor pressure, latent heat of vaporization, liquid viscosity and surface tension were calculated and compiled into the KIVA4 fuel library. The nitrogen monoxide (NO) and carbon monoxide (CO) formation mechanisms were also embedded. After validating the numerical simulation model by comparing the in-cylinder pressure and heat release rate curves with experimental results, further studies have been carried out to investigate the effect of combustion chamber design on flow field, subsequently on the combustion process and performance of diesel engine fueled by biodiesel. Research has also been done to investigate the impact of fuel injector location on the performance and emissions formation of diesel engine.
Highlights
In today’s context, the humankind is heavily dependent on fossil fuels for our energy need
A 3-dimensional computational fluid dynamics modeling is conducted on a direct injection diesel engine fueled by biodiesel using multi-dimensional software KIVA4 coupled with CHEMKIN
The results indicate that Omega combustion chamber (OCC) is more suitable for high speed engines application where a fast combustion is important
Summary
In today’s context, the humankind is heavily dependent on fossil fuels for our energy need. To address people’s concern on fossil fuel depletion and global warming, biodiesel is attracting more and more attentions as a promising alternative to conventional diesel due to its inherit attributes such as biodegradable, renewable, sustainable and carbon neutral [1]. It can replace petroleum diesel and be used in diesel engines without the requirement of any major modifications, reducing the country’s dependence on imported oil. Researchers have shown that the use of biodiesel can result in a substantial reduction in the unburned hydro-carbon (UHC), particulate matter (PM) and carbon monoxide (CO) emissions [2,3,4], but a slight increase in nitrogen oxides (NOx) emission is observed [3,4,5,6]
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