| TURBOCHARGING EFFECTS ON EMISSIONS REDUCTION AND
THERMAL EFFICIENCY UNDER DIESEL/NATURAL GAS
DUAL-FUELED COMBUSTION |
| Sechul Oh , Junho Oh , Junghwan Kim , Sunyoup Lee , Changgi Kim , Seokhwan Lee , Jeongwoo Lee |
1Department of Mobility Power Research, Eco-Friendly Energy Conversion Research Division, Korea Institute of Machinery and Materials
2Automotive Hi-technology Research Center & Division of Mechanical System Engineering, Jeonbuk National University
3School of Energy Systems Engineering, Chung-Ang University |
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| ABSTRACT |
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Dual-fueled combustion, using high and low reactivity fuels simultaneously, is a promising combustion method
that enables reduction of nitrogen oxides (NOx) emission. However, the total amount of NOx emissions in the exhaust gas is
strongly influenced by the overall excessive air ratio (lambda) of air–fuel mixture. Thus, lean mixture condition is important
for NOx emissions although RCCI operating condition is applied. In addition, not only reduction of emissions, but improvement
in BTE requires the boost pressure to be increased. Thus, variations in boost pressure via a controlling turbocharger system was
evaluated under general dual-fueled combustion and RCCI conditions using diesel and natural gas fuels while tracing emissions
and BTE. The results indicated that higher boost pressure was more effective on RCCI condition in reducing NOx emissions
and enhancing BTE and turbocharging system efficiency with lower carbon dioxides, compared to those of general dual-fueled
combustion condition. Especially, turbocharger efficiency of dual-fueled combustion was higher than that of diesel singlefueled
combustion related with composition of exhaust gas and exhaust gas temperatures. |
| Key Words:
B rake the rmal e fficie ncy (BTE), C arbon d ioxide s (CO2), Excessive air ratio (Lambda), Natural gas,
Nitrogen oxides (NOx), Turbocharger efficiency |
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Corresponding Author.
Jeongwoo Lee , Email. 
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