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http://dx.doi.org/10.15435/JILASSKR.2021.26.2.57

Influence of Piston Bowl Geometry on Combustion of a Diesel/CNG Reactivity Controlled Compression Ignition Engine  

Kim, Hyunsoo (한국과학기술원 기계공학과)
Kim, Wooyeong (한국과학기술원 기계공학과)
Bae, Choongsik (한국과학기술원 기계공학과)
Publication Information
Journal of ILASS-Korea / v.26, no.2, 2021 , pp. 57-66 More about this Journal
Abstract
The reactivity controlled compression ignition (RCCI) is the technology that provides two different types of fuel to the combustion chamber with the advantage of significantly reducing particulate matter and nitrogen oxides emissions. However, due to the characteristics of lean combustion, combustion efficiency is worsened. The conventional type of pistons for conventional diesel combustion (CDC) has mostly been used in the researches on RCCI. Because the pistons for CDC are optimized to enhance flow and target spray, the pistons are unsuitable for RCCI. In this study, a piston that is suitable for RCCI is designed to improve combustion efficiency. The new piston was designed by considering the factors such as squish geometry, bowl depth, and surface area. The experiment was carried out by fixing the energy supply to 0.9kJ/cycle and 1.5kJ/cycle respectively. The two pistons were quantitatively compared in terms of thermal efficiency and combustion efficiency.
Keywords
Dual fuel; Reactivity controlled compression ignition; Piston geometry; Heat transfer loss; Squish area;
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