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International Journal of Automotive Technology > Volume 23(6); 2022 > Article
International Journal of Automotive Technology 2022;23(6): 1703-1715.
doi: https://doi.org/10.1007/s12239-022-0148-1
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
PDF Links Corresponding Author.  Jeongwoo Lee  , Email. ngine@jbnu.ac.kr
ABSTRACT
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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