Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Korean Society of Combustion
Journal Basic Information
Journal DOI :
The Korean Society of Combustion
Editor in Chief :
Volume & Issues
Volume 15, Issue 4 - Dec 2010
Volume 15, Issue 3 - Sep 2010
Volume 15, Issue 2 - Jun 2010
Volume 15, Issue 1 - Mar 2010
Selecting the target year
Numerical Investigation on the Thermal Characteristics of Mild Combustion According to Co-axial Air
Hwang, Chang-Hwan ; Baek, Seung-Wook ; Kim, Hak-Young ;
Journal of the Korean Society of Combustion, volume 15, issue 4, 2010, Pages 1~8
Mild combustion is considered as a promising combustion technology for energy saving and low emission of combustion product gases. In this paper, the controllability of reaction region in mild combustion is examined by using co-axial air nozzle. For this purpose, numerical approach is carried out. Propane is considered for fuel and air is considered for oxidizer and the temperature of air is assumed 900K slightly higher than auto ignition temperature of propane. But unlike main air, the atmospheric condition of co-axial air is considered. Various cases are conducted to verify the characteristics of Co-Axial air burner configuration. The use of coaxial air can affect reaction region. These modification help the mixing between fuel and oxidizer. Then, reaction region is reduced compare to normal burner configuration. The enhancement of main air momentum also affects on temperature uniformity and reaction region. The eddy dissipation concept turbulence/chemistry interaction model is used with two step of global chemical reaction model.
The Effect of the Oxygen-Enrichment on the PAH Production in Fuel-Rich
Lee, Ki-Yong ;
Journal of the Korean Society of Combustion, volume 15, issue 4, 2010, Pages 9~14
Numerical simulations of freely propagating fuel-rich
premixed flames were performed at atmospheric pressure in order to understand the effect of the oxygen enrichment on the production of PAH. A chemical kinetic mechanism was used, which involved 157 gas-phase species and 1693 forward reactions. The calculated flame speeds were compared with the experiments for the flames established on the equivalence ratios of 1~1.6, the results of which were in good agreement. As the level of oxygen enrichment was increased, the concentrations of one or four ring aromatic hydrocarbons were decreased. This might cause the fact that the contribution of PAH species to soot was weakened.
Numerical Study on Turbulent Nonpremixed Pilot Stabilized Flame using the Transported Probability Density Function Model
Lee, Jeong-Won ; Kim, Yong-Mo ;
Journal of the Korean Society of Combustion, volume 15, issue 4, 2010, Pages 15~21
The transported probability density function(PDF) model has been applied to simulate the turbulent nonpremixed piloted jet flame. To realistically account for the mixture fraction PDF informations on the turbulent non-premixed jet flame, the present Lagrangian PDF transport approach is based on the joint velocity-composition-turbulence frequency PDF formulation. The fluctuating velocity of stochastic fields is modeled by simplified Langevin model(SLM), turbulence frequency of stochastic fields is modeled by Jayesh-Pope model and effects of molecular diffusion are represented by the interaction by exchange with the mean (IEM) mixing model. To validate the present approach, the numerical results obtained by the joint velocity-composition-turbulence frequency PDF model are compared with experimental data in terms of the unconditional and conditional means of mixture fraction, temperature and species and PDFs.
Numerical Modeling of Soot Formation in
/Air Turbulent Non-premixed Flames
Kim, Tae-Hoon ; Woo, Min-O ; Kim, Yong-Mo ;
Journal of the Korean Society of Combustion, volume 15, issue 4, 2010, Pages 22~28
The Direct Quadrature Method of Moments (DQMOM) has been presented for the solution of population balance equation in the wide range of the multi-phase flows. This method has the inherently interesting features which can be easily applied to the multi-inner variable equation. In addition, DQMOM is capable of easily coupling the gas phase with the discrete phases while it requires the relatively low computational cost. Soot inception, subsequent aggregation, surface growth and oxidation are described through a population balance model solved with the DQMOM for soot formation. This approach is also able to represent the evolution of the soot particle size distribution. The turbulence-chemistry interaction is represented by the laminar flamelet model together with the presumed PDF approach and the spherical harmonic P-1 approximation is adopted to account for the radiative heat transfer.
Influence of Combustor Pressure on Combustion Characteristics and Local Flame Reaction in the Partially Premixed Flames with
Kim, Jong-Ryul ; Son, Je-Ha ; Noh, Young-Gu ; Kim, Yun-Dong ; Choi, Gyung-Min ; Kim, Duck-Jool ;
Journal of the Korean Society of Combustion, volume 15, issue 4, 2010, Pages 29~36
An experimental study was conducted for three different fuels(
) to investigate the combustion characteristics and the local reaction intensity with combustor pressure(-30kpa~30kpa). Regardless of fuel composition, EINOx decreased with reducing pressure decreased. Structure and combustion characteristics were also largely affected by the combustor pressure. In addition, reaction intensity in terms of the changing combustor pressure and equivalence ratio was investigated. Combustion reaction in higher than atmospheric pressure was very active than the lower combustor pressure. When the combustor pressure is lower than the atmospheric pressure, the overall reactivity is noticeably enhanced due to the elevated diffusion process of unburned mixture. It was found that the combustion characteristics of the methane and propane flames are considerably influenced by the pressure while those of ethylene flame are less sensitive to the combustor pressure.
Background Effect on
Chemiluminescence Intensities in a Gas Turbine Combustor
Kim, Dae-Sik ; Lee, Jong-Guen ;
Journal of the Korean Society of Combustion, volume 15, issue 4, 2010, Pages 37~42
The measurement of heat release rate is of great importance in the study of thermo-acoustic instability occurring in lean premixed combustion and the chemiluminescence emission has been used as an indicator of heat release in combustion instability studies primarily for its relative simplicity. This paper presents results of experimental study of flame chemiluminescence from an atmospheric, swirl-stabilized, turbulent lean premixed flame with a main emphasis on the effect of
background level in the
band. The test results show that the effect of
level in the
band is greater than that in the
band. Also, the background to peak ratio for both
bands can be expressed as a function of equivalence ratio, almost regardless of a change in the inlet velocity.
Quantitative Acetone PLIF Measurement of Fuel Distribution in a Gas Turbine Combustor Burner
Jeon, Woo-Jin ; Kim, Hyung-Mo ; Lee, Kang-Yeop ; Yang, Su-Seok ;
Journal of the Korean Society of Combustion, volume 15, issue 4, 2010, Pages 43~52
A non-intrusive measurement, Planar Laser Induced Fluorescence was employed to visualize and measure the fuel distribution of the non-reacting field at the burner exit of gas turbine combustor. Measurement techniques, image processing method and quantification procedure were presented. Also, concentration measurement with gas analyzer was carried out to verify the propriety of PLIF result. The PLIF result coincides well with gas analyzer measurement result. PLIF test result for several other conditions are mentioned as well.
Effect of Gasoline-premixing on Combustion and Exhaust Emissions Characteristics in Compression Ignition Engines
Cha, June-Pyo ; Kwon, Seok-Joo ; Heo, Jeong-Yun ; Lee, Chang-Sik ; Park, Sung-Wook ;
Journal of the Korean Society of Combustion, volume 15, issue 4, 2010, Pages 53~57
The purpose of the present work is to investigate the effect of gasoline-premixing on a combustion and emissions characteristics in a compression ignition engine. For studying combustion characteristics, a combustion pressure and rate of heat release (ROHR) were measured using a single-cylinder DI compression ignition engine with a common-rail injection system and premixed fuel injection system. In addition, exhaust emissions characteristics were studied using emission analyzers and smoke meter. The experimental results showed that the case of gasoline-premixing had longer ignition delay and lower combustion pressure compared to the cases of diesel direct injection. Furthermore, premixed gasoline-air mixture reduced NOx emissions due to low peak of ROHR.
Study on the Correlation between Thermal Characteristics and Heat Accumulation in the Coal Pile
Lee, Hyun-Dong ; Kim, Jae-Kwan ;
Journal of the Korean Society of Combustion, volume 15, issue 4, 2010, Pages 58~64
Spontaneous ignition tests of five different coals with non-iso-thermal and iso-thermal test method based on the standard test procedure of NF T20-036 were carried. These five coals included the 2 low rank coals and 3 bituminous coals. Test results showed that the ignition temperatures of all coals at the iso-thermal conditions were higher than that of non-isothermal condition, and those of low rank SM and BR coal in both nonisothermal and isothermal conditions were lower than bituminous AN and CN coals. The chemical species of coals such as oxygen and hematite also plays an important role in enhancing the ignition rate that the ignition temperature of SM coal was lowered. The heat accumulation tendency of five coals inside outdoor stack pile was monitored with emphasis on the change in the temperature of the coal depth in stack pile. In case of low rank BR coal, its temperature inside coal stack pile due to the rate of high heat accumulation and oxidation was
for other SW bituminous coal. And the heat accumulation rate inside coal stack piles was increased with increased the Cp value which it was defined as the specific heat of coal at constant pressure, whereas other factors such as thermal diffusivity and conductivity of coal relatively had less effect on heat accumulation.
Effect of Particle size and Blending Ratio on Thermo Reaction and Combustion Characteristics in Co-firing with Bituminous and Sub-bituminous Coals
Sung, Yon-Mo ; An, Jae-Woo ; Moon, Cheor-Eon ; Ahn, Seong-Yool ; Kim, Sung-Chul ; Seo, Sang-Il ; Kim, Tae-Hyung ; Choi, Gyung-Min ; Kim, Duck-Jool ;
Journal of the Korean Society of Combustion, volume 15, issue 4, 2010, Pages 65~73
In order to provide fundamental information for developing reaction model in the practical blended coal power plants, effects of particle size and blending ratio on combustion characteristics and thermal reaction in co-firing with bituminous and sub-bituminous coals were experimentally investigated using a TGA and a laboratory-scale burner. Characteristic parameters including ignition, burnout temperature and activation energy were determined from TG and DTG combustion profiles. Distributions of flame length and mean particle temperature were investigated from the visualization of flames in slit-burner system. As coal particle size decreased and volatile matter content increased, characteristic temperatures and activation energy decreased. The ignition/burnout characteristics and activation energy are linearly influenced by a variation in particle size and blending ratio. These results indicated that the control of the coal blending ratio can improve the combustion efficiency for sub-bituminous coals and the ignition characteristics for bituminous coals.