Improving BSFC through Multiple Injections and Varying Cetane Number for a Medium Duty Diesel Engine
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Due to their relatively low carbon dioxide emissions and superior fuel efficiency performance, interest in further utilization of diesel engines for commercial and industrial use continues to grow. The concept of multiple injections provides ever further optimization of the diesel engine in terms of improving emissions, combustion noise, and combustion efficiencies. With the development of highly efficient diesel aftertreatment systems, the need for in-cylinder control of harmful emissions has been significantly reduced. This adaptation lifts the emissions barrier to maximizing combustion efficiency through multiple injections. This study serves to reexamine multiple injection capabilities in improving combustion characteristics, specifically targeting brake specific fuel consumption, without the constraint of reducing emissions through in cylinder means. Tests will be conducted on a John Deere 4.5L 4 cylinder medium-duty industrial diesel engine. A test matrix sweeping injection duration & timing will act as the main data points. Pilot injection, a secondary injection occurring a few degrees prior to the main event, will serve as the additional injection component. As another layer to the study, two fuels with varying cetane numbers will each be utilized in the study to better understand the effect of cetane number on multiple injection event. From these tests, data should yield a strong base from which to analyze peak injection schedules to improve the operating conditions of diesel engines.
Frazier, Cole Tristan (2018). Improving BSFC through Multiple Injections and Varying Cetane Number for a Medium Duty Diesel Engine. Undergraduate Research Scholars Program. Available electronically from