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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Society of Combustion
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Journal DOI :
The Korean Society of Combustion
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Volume & Issues
Volume 21, Issue 2 - Jun 2016
Volume 21, Issue 1 - Mar 2016
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An Evaluation of Emission Characteristics and Fuel Consumption on the Off-road Diesel Engine using VGT and EGR
Ha, Hyeongsoo ; Shin, Jaesik ; Jung, Haksup ; Pyo, Sukang ; Kang, Jungho ;
Journal of the Korean Society of Combustion, volume 21, issue 2, 2016, Pages 1~6
DOI : 10.15231/jksc.2016.21.2.001
To meet the Tier-4 emission standard, a variety of combustion technology in the field of off-road engine has been applied in conjunction with the engine after treatment technology. In this study, as the basis study for applying VGT and HPL EGR to 3.6 L CRDi engine, exhaust gas characteristics and fuel economy characteristics are confirmed in accordance with VGT and EGR operating conditions. Consequently, in the EGR applicable conditions, 60% VGT vane duty condition was confirmed that the trade-off characteristics between NOx and smoke are advantageous. In addition, in view of BSFC, VGT vane duty is considered desirable to control at around 50%.
Experimental Study on Evaporation and Combustion Characteristics of Fuel Droplet with Carbon Nano-Particles in RCM
Ahn, Hyeongjin ; Jyoti, Botchu Vara Siva ; Baek, Seung Wook ;
Journal of the Korean Society of Combustion, volume 21, issue 2, 2016, Pages 7~14
DOI : 10.15231/jksc.2016.21.2.007
Evaporation and combustion characteristics of fuel droplet with carbon nanoparticle were investigated in a rapid compression machine(RCM). RCM is an experimental equipment to simulate one compression stroke of reciprocating engine. Nitrogen was charged into reaction chamber for evaporation experiment, while oxygen was charged for combustion experiment. N990 carbon black and n-heptane were used to synthesize the carbon nanofluids. Surfactant, span80, was used to make synthesis easier. The droplet pictures were taken using a high speed camera with 500 frames per second. Thermocouple, of which tip is
, was used not only to measure transient bulk temperature, but also to suspend the droplet. Reaction chamber temperature was calculated from pressure data. The evaporation rate of nanofluids was improved compared to pure fuel. The ignition delay was promoted due to the nanoparticle, but the burning rate was decreased.
An Experimental Study On Characteristics of Flame and Combustion Stability of Coaxial Jet Injectors
Son, Jinwoo ; Min, Yong Ho ; Sohn, Chae Hoon ;
Journal of the Korean Society of Combustion, volume 21, issue 2, 2016, Pages 15~21
DOI : 10.15231/jksc.2016.21.2.015
Flame characteristics and combustion stability of a swirl coaxial injector are studied experimentally. Characteristics of flame and combustion instability are analyzed with the parameter of MFR (momentum flux ratio) using hexane instead of kerosene. Flame patterns of blue and yellow are changed with variable MFR. Combustion instabilities are measured and analyzed by adopting a model chamber. Combustion instability mapping is made by evaluating damping factor at the 2 L (second longitudinal) mode with variable MFR in 63 cases for operating condition.
Effects of Microwave Induction on the Liftoff and NOx Emission in Methane Micro Jet Flames
Jeon, Young Hoon ; Lee, Eui Ju ;
Journal of the Korean Society of Combustion, volume 21, issue 2, 2016, Pages 22~28
DOI : 10.15231/jksc.2016.21.2.022
High efficient and environment friendly combustion technologies are used to be operated an extreme condition, which results in unintended flame instability such as extinction and oscillation. The use of electromagnetic energy is one of methods to enhance the combustion stability and a microwave as electromagnetic wave is receiving increased attention recently because of its high performance and low-cost system. In this study, an experiment was performed with jet diffusion flames induced by microwave. Micro jet was introduced to simulate the high velocity of industrial combustor. The results show that micro jet flames had three different modes with increasing oxidizer velocity; attached yellow flame, lifted flame, and lifted partially premixed flame. As a microwave was induced to flames, the overall flame stability and blowout limit were extended with the higher microwave power. Especially the interaction between a flame and a microwave was shown clearly in the partially premixed flame, in which the lift-off height decreased and NOx emission measured in post flame region increased with increasing microwave power. It might be attributed to increase of reactivity due to the abundance of radical pool and the enhanced absorption to thermal energy.
A Study of Combustion Instability Mode according to the Variation of Combustor Length in Dual Swirl Gas Turbine Model Combustor
Jang, Munseok ; Lee, Keeman ;
Journal of the Korean Society of Combustion, volume 21, issue 2, 2016, Pages 29~37
DOI : 10.15231/jksc.2016.21.2.029
This study described the experimental investigations of combustion instability in a model gas turbine combustor. Strong coupling between pressure oscillations and unsteady heat release excites a self-sustained acoustic wave, which results in a loud and annoyed sound, and may also lead to a structural damage to the combustion system. In this study, in order to examine the combustion instability phenomenon of a dual swirling combustor configuration, the information of heat release and pressure fluctuation period with respect to the variation in both thermal power and combustor length was collected experimentally. As a result, the fundamental acoustic frequency turned out to increase with the increasing thermal power without respect to the combustor length. The frequency response to the combustor length was found to have two distinct regimes. In a higher power regime the frequency significantly decreases with the combustor length, as it is expected from the resonance of gas column. However, in a lower power regime it is almost insensitive to the combustor length. This insensitive response might be a result of the beating phenomenon between the interacting pilot and main flames with different periods.