Abstract
Research via computational method, specifically by detailed-kinetic soot model offers much more advantages than the simple model as more detailed formation/oxidation process is taken into consideration, thus providing better soot mass concentration, soot size, soot number density as well as information regarding other related species. In the present computational study, investigation of in-cylinder soot concentration as well as other emissions in a single cylinder diesel engine has been conducted, using a commercial multidimensional CFD software, CONVERGE CFD. The simulation was carried out for a close-cycle combustion environment from inlet valve closing (IVC) to exhaust valve opening (EVO). In this case, detailed-kinetic Particulate Mimic (PM) soot model was implemented as to take benefit of the method of moment, instead of commonly implemented simple soot model. Analyses of the results are successfully plotted to demonstrate that the soot size and soot mass concentration are strongly dependent on the detailed soot formation and oxidation process rates. The calculated of soot mass concentration and average soot size at EVO provide the end value of 29.2 mg/m 3 and 2.04 × 10 −8 m, respectively. Besides, post-processing using EnSight shows the qualitative results of soot concentration along simulation period in the combustion chamber.
Highlights
Fast evolution in diesel engine technology promises a good return in engine performance and efficiency
The aim of this study is to investigate the in-cylinder soot formation process within preset engine conditions using detailed soot model, namely Particulate Mimic (PM) model
A multidimensional Computational Fluid Dynamic (CFD) software, CONVERGE CFD which was developed by Convergent Science Inc has been used to simulate combustion environment but limited to the close-cycle combustion which is from inlet valve closing (IVC) at -168° Crank Angle (CA) After Top Dead Centre (ATDC) to exhaust valve opening (EVO) at 138° CA ATDC
Summary
Fast evolution in diesel engine technology promises a good return in engine performance and efficiency. Stringent emission law in recent times forces diesel engine to be designed for superior performance and with lower emission level. Particulate emission will still be a hot issue to be debated and solved, so that emissions emitted comply with current law. One of a major part of particulate matters, soot, definitely gives bad impact to the environment and to human well-being. This undesirable element was reported to cause global warming, acid rain, smog, odors, respiratory and other health hazards [1,2,3,4]. A number of researchers successfully discovered the toxic effect of soot to human health [5,6,7,8] and the cause for a decrease in the overall engine performances [9,10,11,12]
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