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- 검색키워드
- 저자 : Narankhuu Jamsran (검색결과 37 건)
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Narankhuu Jamsran,O Seok Kweon,Ock Teack Lim 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
The purpose of this study is to investigate combustion characteristics of HCCI engine when mixture of DME and n-Butane is used as the fuel. Effects of DME and n-Butane stratified pre-mixture on HCCI combustion characteristics were analyzed. A combination of DME and n-Butane to create a new chemical reaction model, the existing chemical reaction models of the DME and n-Butane were compared to ensure efficiencies. Investigated effects of pressure rise rate reduction on each case of stratified charge of fuel mixture. The objective of this work is to understand the characteristics of combustion of DME/n-Butane mixture for using fuel stratification. The calculations are performed by CHEMKIN and modified SENKIN.
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Narankhuu Jamsran,Sangjin Yoon,Ocktaeck Lim 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
This work was explored various effects of inert gas constituents of exhaust gas recirculation (EGR) on reducing the pressure rise rate by controlling the autoignition reactivity of homogeneous charge compression ignition combustion fueled with DME. CHEMKIN-PRO was used as a solver while Curran"s DME reaction scheme was utilized to understand the function of EGR. At first, influences of EGR and its constituents were shown on reducing the pressure rise rate. Then, to better understand and to elucidate the function of EGR on autoignition reactivity, contribution matrix has been used to extract important reaction paths for heat release from a reaction mechanism. As a result, the high EGR concentration can improve the high-load HCCI combustion robustness through the heat release of H₂O₂ reaction was generated in expansion process.
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A Review of DME as an Alternative Fuel for Automotive Engines
Narankhuu Jamsran,Ocktaeck Lim 한국자동차공학회 2015 한국자동차공학회 부문종합 학술대회 Vol.2015 No.5
Regarding with limited resources and increasing demand of fossil fuels, dimethyl ether is attracted much as an alternative of conventional diesel fuel due to its clean burn and wide variety of resources such as natural gas, biomass, food waste etc. This paper reviews the development and progress of its technical potential and confirm its feasibility for automotive engines. The review compares its physical properties and molecular structure of DME with conventional fuels. Fuel supply system and injection system required the modification from conventional system due to high vapor pressure for liquefaction, low density and viscosity characteristics of DME. As a result, spray characteristics shown shorter spray tip penetration, wider angle and higher amount of droplet size. For combustion of DME, ignition in constant volume combustion chamber as well as in compression ignition engine results were shown that low amount of soot emissions from no carbon to carbon structure. Also, moderate amount of HC and CO emissions can be obtained compared with conventional compression ignition combustion. NOx emissions from DME engine has potential to meet with NOx regulation by utilizing exhaust gas recirculation as well as lean-NOx trap. Finally, the review identified the numerical studies relating to chemical kinetics and controlling methods of advanced compression ignition.
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Narankhuu Jamsran,임옥택 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.6
We investigated the efficacy of fuel stratification in a pre-mixture of dimethyl ether (DME) and n-butane, which have different autoignition characteristics, for reducing the pressure rise rate (PRR) of homogeneous charge compression ignition engines. A new chemical reaction model was created by mixing DME and n-butane and compared with existing chemical reaction models to verify the effects observed. The maximum PRR depended on the mixture ratio. When DME was charged with stratification and n-butane was charged with homogeneity, the maximum PRR was the lowest among all the mixtures studied. Calculations were performed using CHEMKIN and modified using SENKIN software.
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