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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Society of Combustion
Journal Basic Information
Journal DOI :
The Korean Society of Combustion
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Volume & Issues
Volume 19, Issue 4 - Dec 2014
Volume 19, Issue 3 - Sep 2014
Volume 19, Issue 2 - Jun 2014
Volume 19, Issue 1 - Mar 2014
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Experimental Study on Downwardly Spreading Flame over Inclined Polyethylene-insulated Electrical Wire with Applied AC Electric Fields
Lim, Seung Jae ; Park, Jeong ; Kim, Min Kuk ; Chung, Suk Ho ; Osamu, Fujita ;
Journal of the Korean Society of Combustion, volume 19, issue 4, 2014, Pages 1~7
DOI : 10.15231/jksc.2014.19.4.001
An experimental study on downwardly spreading flame over slanted electrical wire, which is insulated by Polyethylene (PE), was conducted with applied AC electric fields. The result showed that the flame spread rate decreased initially with increase in inclination angle of wire and then became nearly constant. The flame shape was modified significantly with applied AC electric field due to the effect of ionic wind. Such a variation in flame spread rate could be explained by a thermal balance mechanism, depending on flame shape and slanted direction of flame. Extinction of the spreading flame was not related to angle of inclination, and was described well by a functional dependency upon the frequency and voltage at extinction.
Numerical Study on Flow Distribution of Fuel Nozzles for a Combustor in a Micro Gas Turbine
Kim, Taehoon ; Do, Kyu Hyung ; Han, Yong-Shik ; Kim, Myungbae ; Choi, Byung-Il ;
Journal of the Korean Society of Combustion, volume 19, issue 4, 2014, Pages 8~13
DOI : 10.15231/jksc.2014.19.4.008
Flow distribution of fuel nozzles for a combustor in a micro gas turbine is numerically investigated. The fuel supply system for the present study has 12 single nozzles with a diameter of several hundred micrometers. A uniform temperature distribution of a combustor outlet should be achieved for maximizing the lives of the turbine blades and nozzle guide vanes. For this, it is very important to uniformly supply fuel to a combustor. In order to investigate flow distributions of fuel nozzles, numerical models for fuel nozzles are made and solved by a commercial code, ANSYS FLUENT. An effect of a fuel nozzle diameter and fuel flow rates on flow distribution of fuel nozzles is numerically investigated. As a result, non-uniformity is increasing as a diameter of a single fuel nozzle increases. Finally, an appropriate diameter of a single fuel nozzle is suggested.
Study on the Characteristics of an Annular Combustor for a 500 W Class Micro Gas Turbine Generator
Do, Kyu Hyung ; Kim, Taehoon ; Han, Yong-Shik ; Kim, Myung-Bae ; Choi, Byung-Il ;
Journal of the Korean Society of Combustion, volume 19, issue 4, 2014, Pages 14~20
DOI : 10.15231/jksc.2014.19.4.014
In the present study, an annular combustor for a 500 W class micro gas turbine generator was designed and its characteristics were investigated by using both numerical and experimental methods. For this purpose, geometrical configurations of the annular combustor were determined in the aspect of the aerodynamic and chemical consideration. Also, fluid flow and pressure drop characteristics in the combustor were numerically studied by using commercial tool, FLUENT. Based on the numerical results, the diameter and the angle of air admission holes in the primary zone were chosen to be 2.5 mm and
, respectively. Finally, an integrated test unit, which consisted of a compressor, combustor, turbine, and motor/generator, was developed in order to measure the combustor efficiency. As the temperature difference between the combustor inlet and the turbine inlet or the air mass flow rate increased, the combustor efficiency increased and it was over 90% when the air mass flow rate was larger than 7.30 g/s. It was shown that the annular combustor developed in this study met the design requirement for a 500 W class micro gas turbine generator.
Design Methodology of an Annular Combustor for Micro Gas Turbines
Cho, Ju Hyeong ;
Journal of the Korean Society of Combustion, volume 19, issue 4, 2014, Pages 21~27
DOI : 10.15231/jksc.2014.19.4.021
MGT (micro gas turbines) have been gaining particular attentions with a variety of commercial and military applications due to their advantages such as compact size, simple operability, easy maintenance, and low emissions. This study deals with development processes of an annular combustor applied to MGT. Preliminary design methodologies are used to size the main components of the combustor. Key design features such as liner temperatures and pressure losses are evaluated. Results show that the estimated liner temperatures are within acceptable range. Dominant factors for pressure losses are estimated to be air admission holes and burner swirlers.
Effects of Lewis Number and Preferential Diffusion in Syngas Flame Diluted with He and Ar
Kim, Tae Hyung ; Park, Jeong ; Kwon, Oh Boong ; Park, Jong Ho ;
Journal of the Korean Society of Combustion, volume 19, issue 4, 2014, Pages 28~34
DOI : 10.15231/jksc.2014.19.4.028
Numerical study is conducted to grasp flame characteristics in
syngas counterflow diffusion flames diluted with He and Ar. An effective fuel Lewis number, applicable to premixed burning regime and even to moderately-stretched diffusion flames, is suggested through the comparison among fuel Lewis number, effective Lewis number, and effective fuel Lewis number. Flame characteristics with and without the suppression of the diffusivities of H,
, and He are compared in order to clarify the important role of preferential diffusion effects through them. It is found that the scarcity of H and He in reaction zone increases flame temperature whereas that of
deteriorates flame temperature. Impact of preferential diffusion of H,
, and He in flame characteristics is also addressed to reaction pathways for the purpose of displaying chemical effects.
Fundamental Study for Reformation of Safety Standard about Portable Butane Gas Range
Kim, Sooik ; Keum, Kuk Bin ; Yu, Byeonghun ; Lee, Chang-Eon ; Kim, Young-Gu ;
Journal of the Korean Society of Combustion, volume 19, issue 4, 2014, Pages 35~41
DOI : 10.15231/jksc.2014.19.4.035
The experiment was conducted to measure temperature and pressure around operating portable butane gas ranges with oversized cookwares. In this experiment, portable butane gas range with different safety equipment and two kinds of oversized cookware, each of which is made of aluminum alloy and rock, was used. As a result, temperature of the bottom of the butane and the pressure of butane barrel tend to aligned with each other. Through this result, it is reasonable that a safety criteria can be decided based on the temperature of the bottom of butane. Especially, portable butane gas ranges are safely conducted under the condition of the temperature is under 50 degree and pressure is under 500 kPa, respectively, at the bottom of the butane barrel.
Improvement of Emissions from Diesel Engine according to the Korean Standard Test Cycle in the Construction Equipment
Joo, Taeheun ; Yu, Seunghun ; Lee, Chang-Eon ;
Journal of the Korean Society of Combustion, volume 19, issue 4, 2014, Pages 42~48
DOI : 10.15231/jksc.2014.19.4.042
The emission standard of diesel engine on the construction equipment has been rapidly enhanced in advanced countries, because most of air pollutions was caused by construction equipment. So, all of the construction equipments will be tested for emission with standard measurement mode. But, the standard measurement mode of construction equipment is different for non-road and one for the road in korea. This study was conducted to measure emission characteristics of the construction equipment with changed standard measurement mode and to improvement the emissions experimentally.
Design Criterion for the Size of Micro-scale Pt-catalytic Combustor in Respect of Heat Release Rate
Lee, Gwang Goo ; Suzuki, Yuji ;
Journal of the Korean Society of Combustion, volume 19, issue 4, 2014, Pages 49~55
DOI : 10.15231/jksc.2014.19.4.049
Design criterion for the size of micro Pt-catalytic combustor is investigated in terms of heat release rate. One-dimensional plug flow model is applied to determine the surface reaction constants using the experimental data at stoichiometric butane-air mixture. With these reaction constants, the mass fraction of butane and heat release rate predicted by the plug flow model are in good agreement with the experimental data at the combustor exit. The relationship between the size of micro catalytic combustor and mixture flowrate is introduced in the form of product of two terms-the effect of fuel conversion efficiency, and the effect of chemical reaction rate and mass transfer rate.