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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
Editor in Chief :
Volume & Issues
Volume 8, Issue 3 - Sep 2003
Volume 8, Issue 2 - Jun 2003
Volume 8, Issue 1 - Mar 2003
Selecting the target year
Effect of Oxygen Enriched Air on the Combustion of a Turbulent Diffusion Flat Flame
Kwark, Ji-Hyun ; Jeon, Chung-Hwan ; Chang, Young-June ;
Journal of the Korean Society of Combustion, volume 8, issue 3, 2003, Pages 1~7
Combustion using oxygen enriched air is an energy saving technology that can increase thermal efficiency by the improvement of burning rate and by the high temperature flame. Flame figures, OH radical intensities, temperature distributions and emission concentrations were measured according to oxygen enriched concentration and swirl number in a turbulent diffusion flat flame. It appeared that flame figure became flat and NO concentration decreased with increase of swirl number, and that the flame temperature increased high with increase of oxygen enriched concentration. In particular, it was most significant between oxygen concentration
Effect of Fuel Mixing on PAH and Soot Formation in Counterflow Diffusion Flames
Yoon, S.S. ; Lee, S.M. ; Chung, S.H. ;
Journal of the Korean Society of Combustion, volume 8, issue 3, 2003, Pages 8~14
In order to investigate the effect of fuel mixing on PAH and soot formation, four species of methane, ethane, propane and propene have been mixed in counterlfow ethylene diffusion flame. Laser-induced incandescene and laser-induced fluorescene techniques were employed to measure soot volume fraction and polycyclic aromatic hydrocarbon (PAH) concentration, respectively. Results showed that the mixing of ethane (or propane) in ethylene diffusion flame produces more PAHs and soot than those of propene. Considering that propene directly dehydrogenates to propargyl radical, this behavior implied that the enhancement of PAH and soot formation by the fuel mixing of ethylene and ethane (or propane) cannot be explained solely by propargyl radical directly dehydrogenated from ethane (or propane). Thus, combination reactions between C1 and C2-species for the formation of propargyl was suggested to identify the synergistic effect occurring in the flames of ethylene and propane (or ethane) mixtures.
Flame Hole Dynamics Model of a Diffusion Flame in Turbulent Mixing Layer
Kim, Jun-Hong ; Chung, S.H. ; Ahn, K.Y. ; Kim, J.S. ;
Journal of the Korean Society of Combustion, volume 8, issue 3, 2003, Pages 15~23
Partial quenching structure of turbulent diffusion flames in a turbulent mixing layer is investigated by the method of flame hole dynamics in order to develop a prediction model for turbulent flame lift off. The essence of flame hole dynamics is derivation of the random walk mapping, from the flame-edge theory, which governs expansion or contraction of flame holes initially created by local quenching events. The numerical simulation for flame hole dynamics is carried out in two stages. First, a direct numerical simulation is performed for constant-density fuel-air channel mixing layer to obtain the turbulent flow and mixing fields, from which a time series of two dimensional scalar dissipation rate array is extracted at a fixed virtual flame surface horizontally extending from the end of split plate to the downstream. Then, the Lagrangian simulation of the flame hole random walk mapping projected to the scalar dissipation rate array yields temporally evolving turbulent extinction process and its statistics on partial quenching characteristics. The statistical results exhibit that the chance of partial quenching is strongly influenced by the crossover scalar dissipation rate while almost unaffected by the iteration number of the mapping that can be regarded as a flame-edge speed.
Tomographic Reconstruction of Asymmetric Soot Structure from Multi-angular Scanning
Lee, Sang-Min ; Hwang, Jun-Young ; Chung, Suk-Ho ;
Journal of the Korean Society of Combustion, volume 8, issue 3, 2003, Pages 24~30
A convolution algorithm combined with Fourier transformation has been applied to the tomographic reconstruction of asymmetric soot structure to identify the local soot volume fraction distribution. Line-of-sight integrated data from light extinction measurement with multi-angular scanning formed basic information for the deconvolution. Multi-peak following interpolation technique was applied to obtain the effect of increasing number of scanning angles. Height-by-height reconstructed soot volume fraction distribution was compared with laser-induced incandescence signals.
A Study on the Combustion Characteristic and Soot Distribution of a Common Rail Type D.I.Diesel Visualized Engine with Pilot Injection
Han, Yong-Taek ; Lee, Jae-Yong ; Lee, Ki-Hyung ;
Journal of the Korean Society of Combustion, volume 8, issue 3, 2003, Pages 31~37
The objective of this work is to investigate the effect of swirl, injection pressure and pilot injection on D.I.Diesel combustion by using a transparent engine system. The test engine is equipped with common rail injection system to obtain high pressure and to control injection timing and duration. In this study, the combustion analysis and steady flow test were conducted to estimate the heat release rate from in-cylinder pressure and pilot injection was investigated by using LII technique. As the results, high injection pressure was found to shorten ignition delay as well as enhance peak pressure and heat release rate was greatly affected by injection timing and pilot injection. In addition, the results showed that the period of soot formation corresponded to the diffusion flame.
A Study of NO Formation Characteristics in Laminar Flames Using 2-D LIF Technique
Lee, Won-Nam ; Cha, Min-Suk ; Song, Young-Hoon ;
Journal of the Korean Society of Combustion, volume 8, issue 3, 2003, Pages 38~48
OH, CH and NO radical distributions have been measured and compared with the numerical analysis results in methane/air partially premixed laminar flames using 2-D LIF technique. The pick intensity of OH LIF signal is insensitive to fuel equivalence ratio: however, CH LIF intensity decreases as equivalence ratio increases and the NO concentration increases with equivalence ratio. The contribution of the prompt NO, formed near premixed reaction zone, to the total NO formation is evident from the OH, CH, and NO PLIF images in which the dilution effect of nitrogen is minimal for the highest equivalence ratio. Measured OH and NO LIF signals in counterflow flames agree with the computed concentration distributions. Both numerical and experimental results indicate that the structural change in a flame alters the NO formation characteristics of a partially premixed counterflow flame. The nitrogen dilution also changes flame structure, temperature and OH radical distributions and results in the decreased NO concentrations in a flame. The levels of decrease in NO concentrations, however, depends on the premixedness(
) of a flame. The larger change in the flame structure and NO concentrations have been observed in a premixed flame(
), which implies that the premixedness is likely to be a factor in the dilution effect on NO formation of a flame.