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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 12, Issue 4 - Dec 2007
Volume 12, Issue 3 - Sep 2007
Volume 12, Issue 2 - Jun 2007
Volume 12, Issue 1 - Mar 2007
Selecting the target year
Feasibility Study of Low NOx Combustion based on FGR using Plasma Reformer
Kim, Kwan-Tae ; Lee, Dae-Hoon ; Cha, Min-Suk ; Keel, Sang-In ; Yun, Jin-Han ; Kim, Dong-Hyun ; Song, Young-Hoon ;
Journal of the Korean Society of Combustion, volume 12, issue 3, 2007, Pages 1~7
A combined hydrogen generator of plasma and catalytic reformer was developed, and was applied to stabilize unstable flame of 200,000 Kcal/hr LPG combustor. The role of the plasma reformer was to generate hydrogen in a short period and to heat-up the catalytic reformer during the start-up time. After the start-up period, the catalytic reformer generates hydrogen through steam reforming with oxygen (SRO) reactions. The maximum capacity of the hydrogen generator was enough 100 lpm to stabilize the flame of the present combustor. In order to reduce NOx and CO emissions simultaneously, 1) FGR (Flue Gas Recirculation) technique has been adopted and 2) the hydrogen was added into the fuel supplied to the combustor. Test results showed that the addition of 25% hydrogen and 30% FGR rate lead to simultaneous decrease of CO and NOx emissions. The technique developed in the present study showed good potential to replace
SCR technique, especially in the small-scale combustor applications.
Numerical Modeling of Turbulent Premixed Lifted Flames in Low-Swirl Burner
Kang, Sung-Mo ; Lee, Jeong-Won ; Kim, Yong-Mo ; Chung, Jae-Hwa ; Ahn, Dal-Hong ;
Journal of the Korean Society of Combustion, volume 12, issue 3, 2007, Pages 8~15
This study has numerically modelled the combustion processes of the turbulent swirling premixed lifted flames in the low-swirl burner (LSB). In these turbulent swirling premixed flames, the four tangentially-injected air jets induce the turbulent swirling flow which plays the crucial role to stabilize the turbulent lifted flame. In the present approach, the turbulence-chemistry interaction is represented by the level-set based flamelet model.. Two-dimensional and three-dimensional computations are made for the various swirl numbers and nozzle length. In terms of the centerline velocity profiles and flame liftoff heights, numerical results are compared with experimental data The three-dimensional approach yields the much better conformity with agreements with measurements without any analytic assumptions on the inlet swirl profiles, compared to the two-dimensional approach. Numerical clearly results indicate that the present level-set based flamelet approach has realistically simulated the. structure and stabilization mechanism of the turbulent swirling stoichiometric and lean-premixed lifted flames in the low-swirl burner.
The Application of Dump Combustor for Evaluation of After-Treatment System
Nam, Youn-Woo ; Lee, Won-Nam ; Oh, Kwang-Chul ; Lee, Chun-Beom ;
Journal of the Korean Society of Combustion, volume 12, issue 3, 2007, Pages 16~23
Employing an after-treatment system has almost become a mandatory requirement for Diesel vehicles, which results from a reinforced exhaust regulations as the number of vehicles powered by a Diesel engine increases. The Diesel Particulate Filter (DPF) system is considered as one of the most efficient method to reduce particulate matter (PM); however, the improvement of a regeneration performance at any engine operation point presents a considerable challenge by itself. Temperature, gas composition and flow rate of exhaust gas are important parameters in DPF evaluation processes, especially during a regeneration process. Engine dynamometer and segment tester are generally used in DPF evaluation so far. These test methods, however, could not completely evaluate the effect of various parameters on real DPF, such as oxygen concentration, amount of soot and exhaust gas temperatures. The evaluation of DPF systems using a dump combustor has been verified experimentally and this dump combustor system is likely to be appropriate for the DOC (Diesel Oxidation Catalyst) and SCR (Selective Catalytic Reduction) assessments test, too.
The Effect of Feeding Characteristics on the Temperature Distribution of Rotary Kiln
Park, Jong-Seok ; Chun, Chul-Kyun ;
Journal of the Korean Society of Combustion, volume 12, issue 3, 2007, Pages 24~32
A theoretical model was developed for rotary kiln and computational study was conducted to find the effect of feeding characteristics. One dimensional model with the variations of heating distribution, length of heating zone, excess air ratio and revolution was considered. The comparison of parallel-flow rotary kiln with that of counter-flow was conducted. For parallel-flow type, it is found that the variation of temperature of solid is not great for the zone that is following flame-heating zone. This zone is good to take the special treatment because thermal deviation is small and contacting time is enough for another treatment. Increase of excess air ratio have the effect of decreasing solid temperature. But this effect of decreasing solid temperature goes small for the great excess air ratio. The heating is efficient for the flame which has the maximum heating at the central region of the full length.
Numerical Modeling for Vaporization, Auto-Ignition and Combustion Processes of Dimethyl Ether (DME) Fuel Sprays
Yu, Yong-Wook ; Lee, Jeong-Won ; Kim, Yong-Mo ;
Journal of the Korean Society of Combustion, volume 12, issue 3, 2007, Pages 33~39
The present study is mainly motivated to investigate the vaporization, auto-ignition and combustion processes in high-pressure engine conditions. In order to realistically simulate the dimethyl ether (DME) spray dynamics and vaporization characteristics in high-pressure and high-temperature environment, the high-pressure vaporization model is utilized. The interaction between chemistry and turbulence is treated by employing the Representative Interaction Flamelet (RIF) model. The detailed chemistry of 336 elementary steps and 78 chemical species is used for the DME/air reaction. Numerical results indicate that the RIF approach, together with the high-pressure vaporization model, successfully predicts the essential feature of ignition and spray combustion processes.