Abstract
The aim of this study was to confirm the effects of two-stage combustion on the combustion and NOx reduction characteristics of a four cylinder direct injection diesel engine. In order to analyze the combustion and emission characteristics, various injection parameters, such as injection quantity, injection timing and injection pressure were used under constant engine speed and engine load. In addition, the experimental results of two-stage combustion are compared to the single injection when injection timing is 5° BTDC. The experimental results showed that NOx emissions were significantly reduced when applying two-stage combustion. In particular, an injection strategy when the first and second injections have a same quantity, the results showed the maximum reduction of NOx emissions in this experiment. The NOx emissions were also reduced when the timing of the first injection was advanced. However, NOx emissions indicated almost similar concentration regardless of first injection timings when the first injection timing was earlier than 50° BTDC. In the case of soot emissions were slightly increased compare to the single injection cases at tested conditions.
Highlights
Diesel engines with high thermal efficiency and low consumption have been widely used in industrial fields, and the transportation system
Effect of First Injection Quantity and Injection Timings. The combustion characteristics, such as combustion pressure, the rate of heat release (ROHR) and accumulated heat release, as a function of the first injection mass are shown in Figure 2(a) and 2(b), respectively
To investigate the effects of first injection quantity on the combustion and emission characteristics, the first injection mass was changed from 2 mg/cycle to 10 mg/cycle
Summary
Diesel engines with high thermal efficiency and low consumption have been widely used in industrial fields, and the transportation system. The control of high injection pressure, injection timing and injection mass can be realized by using an electronically controlled common rail system. Harmful gases from diesel engine have become serious health risks to humans. For these reasons, diesel engine emission regulations have become become stricter year by year, many researchers are being required to satisfy a these regulations and the need for development of new combustion technologies or alternative resources such as biomass and natural gas [1,2,3]. Homogeneous charge compression ignition (HCCI) and premixed charge compressed ignition (PCCI) combustion strategy have being investigated by many researchers [4,5,6]
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