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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 7, Issue 4 - Dec 2002
Volume 7, Issue 3 - Sep 2002
Volume 7, Issue 2 - Jun 2002
Volume 7, Issue 1 - Mar 2002
Selecting the target year
Characteristics of Laminar Lifted Flame in High Temperature Coflow
Kim, Kil-Nam ; Won, Sang-Hee ; Cha, Min-Suk ; Chung, Suk-Ho ;
Journal of the Korean Society of Combustion, volume 7, issue 2, 2002, Pages 1~6
Characteristics of laminar lifted flames of propane highly-diluted with nitrogen have been investigated at various temperatures of coflow air. At various fuel mole fractions, the base of laminar lifted flames has the structure of tribrachial (or triple) flame. The liftoff heights are correlated well with the stoichiometric laminar burning velocity considering initial temperature at a given coflow velocity. It shows that lifted flames are stabilized on the basis of the balance mechanism between local flow velocity and the propagation speed of tribrachial flame, regardless of the temperature of coflow and fuel mole fraction. Lifted flames exist for a jet velocity even smaller than the stoichiometric laminar burning velocity, and liftoff velocity increases more rapidly than stoichiometric laminar burning velocity as coflow temperature increases. These can be attributed to the buoyancy effect due to the density difference.
Measuement of Temperature Probability Density Functions Variation in a Flame Near Fuel Nozzle of Gas Turbine Combustor Sector Rigs by CARS Thermometry
Park, Chul-Woung ; Lee, Jong-Ho ; Han, Yeoung-Min ; Ko, Young-Sung ; Lee, Kang-Yeop ; Kim, Hyung-Mo ; Lee, Soo-Yong ; Yang, Soo-Seok ; Lee, Dae-Sung ; Jeon, Chung-Hwan ; Chang, Young-June ; Shin, Hyun-Dong ; Hahn, Jae-Won ;
Journal of the Korean Society of Combustion, volume 7, issue 2, 2002, Pages 7~14
The probability density functions (PDF) of temperature were measured by coherent anti-Stokes Raman Spectroscopy (CARS) in flames of gas turbine combustor sector rig of an aero-engine. The combustor was operated at simulated ground idle conditions with standard kerosene fuel. Temperature PDFs had been measured near fuel nozzle with change of rotation of a swirler and existence of a prefilmer. The characteristic features of temperature PDFs showed the variation of combustion configurations at four experimental conditions. Without a prefilmer, large recirculation of high temperature gas was expected in the co-flow condition and un vaporized fuel fragments were detected in the counter-flow condition. With a prefilmer, the enhanced mixing increased combustion intensity near fuel nozzle in the counter-flow condition and the flame was attached far from the fuel nozzle in the co-flow condition.
Experimental Investigation on Premixed Combustion Characteristics with Suction & Blow Fans
Kang, Ki-Bal ; Kim, Dong-Il ; Oh, Sang-Heun ;
Journal of the Korean Society of Combustion, volume 7, issue 2, 2002, Pages 15~23
We measured emission indices for
, CO, temperature and radical characteristics for partially premixied flames formed by suction & blow fans air condition. At sufficiently high levels of partial premixing a double flame structure consisting of a rich premixed inner flame and outer diffusion flame was established similar to that previously observed in premixed flames.
, Temperature. CO concentration were experimented with approximately constant air flow rate and decreasing equivalence ratios. The reduction in
, and temperature at suction condition as compared with that for blow condition was approximately 20%, but on the contrary, CO emission was increased. In addition, We measured temperature distributions and found that temperature increased continuously with increasing partial premixing. We also estimated CH,
radical intensity. CH and
radicals provide evidence that, for the present measurement, CH and
radicals intensity was associsated with their premixed component. And we observed stronger
, CH radicals intensity at suction conditions than blow conditions.
Morphological Study on the Soot Transition in a Propane/Air Laminar Diffusion Flame
Shim, Sung-Hoon ; Yoo, Chang-Jong ; Shin, Hyun-Dong ;
Journal of the Korean Society of Combustion, volume 7, issue 2, 2002, Pages 24~33
The morphology of deposits on
thin SiC filaments has been investigated with SEM in a co-flowing, propane/air laminar diffusion flame. The average size of mature soot particles deposited in the luminous flame edge is strongly dependent on their axial position in a typical heavily sooting flame. The surface growth of liquid-phase PAHs molecules and the transition to soots from fully-developed precursors could be observed in the radial deposition of the flame. Two sooting regimes were found: one is the transition from the condensed-phase precursors; the other is the aggregation of smaller soot particles (or chains of them) to be carried along particle path lines. In the high temperature flame edge outside the soot luminous flame surface, the very thin fiber-like structures, which are about 10 nm thick, were found.
Effect of Oxygen Enrichment in a Swirling Diffusion Gas Burner
Lee, Yong-Hoo ; Lee, Jin-Seok ; Lee, Woo-Seob ; Lee, Do-Hyung ;
Journal of the Korean Society of Combustion, volume 7, issue 2, 2002, Pages 34~41
To investigate the combustion characteristics of a swirling diffusion gas burner with oxygen enrichment, mean temperature, CO,
, and HC concentrations were measured at various oxygen enrichment conditions. According to the results, the flame temperature increased and the region of high temperature was expanded with increasing oxygen concentration. The
concentrations increased, while the CO concentrations decreased in proportion to the increase of oxygen concentration. On the other hand, the HC concentrations were decreased and this tendency was very strong at the downstream of the combustor.
Combustion and Emission Characteristics of High Calorific Industrial Waste Burned in a Small-scale Incinerator
Lee, Gyo-Woo ; Lee, Sung-Jun ; Kim, Byung-Hwa ; Lee, Seung-Woo ; Jurng, Jong-Soo ;
Journal of the Korean Society of Combustion, volume 7, issue 2, 2002, Pages 42~48
Experiments on burning process of the industrial wastes were performed on a nozzle-type grate in the industrial waste incinerator with a capacity of 160 kilograms per hour. The temporal variations of temperatures and concentrations of the exhaust gas were measured and analyzed. The synthetic leather waste with the moisture content less than 2% was used. The experimental results show that the CO concentration in the exhaust gas exceeds the limit, 600 ppm, and the gas temperature fluctuates too much when 8 kg of waste was supplied every 3 minutes, equivalent to the capacity of 160kg per hour. That is a typical burning mode of this high-calorific industrial waste. When the smaller unit waste input, 6kg per every 2 min 15 seconds was supplied, we could reduce the fluctuations of the furnace temperature and improve the exhaust emissions, especially the CO concentration.
Assessment of Reynolds Stress Model for the Analysis of Floating Flames in Stagnating Flows
Im, Yong-Hoon ; Huh, Kang-Yul ;
Journal of the Korean Society of Combustion, volume 7, issue 2, 2002, Pages 49~61
Numerical simulation is performed for stagnating turbulent flows of impinging and countercurrent jets by the Reynolds stress model(RSM). Results are compared with those of the
model and available data to assess the flow characteristics and turbulence modes. Three variants of the RSM tested are those of Gibson and Launder(GL), Craft and Launder(GL-CL) and Speziale, Sarkar and Gatski(SSG). As well known, the
model overestimates turbulent kinetic energy near the wall significantly. Although the RSM is superior to the
model, it shows considerable difference according to how the redistributive pressure-strain term is modeled. Results of the RSM for countercurrent jets are improved with the modified coefficients for the dissipation rate,
suggested by Champion and Libby. The performance of the three variants of the RSM model for stagnating flows are assessed.
Measurements of the Burning Velocities of Flamelets in a Turbulent Premixed Flame
Furukawa, Junichi ; Noguchi, Yoshiki ; Hirano, Toshisuke ; Williams, Forman A. ;
Journal of the Korean Society of Combustion, volume 7, issue 2, 2002, Pages 62~68
To investigate statistics of flamelet in a turbulent premixed flame and to obtain components of their burning velocities in a vertical plane above a pipe-flow burner, the local motion of flamelets with respect to gas are measured by specially arranged diagnostics, composed of an electrostatic probe with four identical sensors and a two-color four-beam LDV system. With this technique, the three-dimensional local flame- front-velocity vector is measured by the electrostatic probe for the first time, and simultaneously the axial and radial components of the local gas-velocity vector in a vertical plane above the vertically oriented burner are measured by the LDV system. Two components of burning velocities of planar flamelets can be obtained from these results and are found to be distributed over different directions and to range in magnitude from nearly zero to a few times the planar, un strained adiabatic laminar burning velocity measured in the unburnt gas. It may be concluded from these results that turbulence exerts measurable influences on flamelets and causes at least some of them to exhibit increased burning velocity.