상호작용하는 SNG-Air 희박 예혼합 비대칭 화염의 소화 특성

다국어 초록 (Multilingual Abstract)

Experimental and numerical studies were conducted to clarify the extinction mechanism in mutually interacting SNG (synthetic natural gas) - air premixed asymmetric counter-flow flames. The detailed kinetic mechanism of UC San Diego with which the priority of predicting measured extinction boundaries was validated was adopted to analyze various aspects via up and downstream interactions on extinction boundaries in the flame stability map. The flame stability map was presented with a functional dependency on methane mole fractions in the cold stream ejecting from upper and lower nozzles by varying the global strain rate. Increasing global strain rate lead gradually slanted and configuring of island flammable region and finally only one flammable condition at 740 s<SUP>-1</SUP> through the shrinkage of flammable region. The interacting lean-lean asymmetric flames of extinction boundaries have flame speed of positive (negative) depending on the deviation of methane mole fraction for two reactants. The extinction mechanism of those flames was explained and discussed by emphasizing important role of downstream chemical interaction (via H and CO) and upstream thermal interaction (via conductive heat loss from stronger flame to unburned mixture).

목차 (Table of Contents)

• ABSTRACT
• 1. 서론
• 2. 실험 및 수치해석 방법
• 3. 결과 및 논의
• 4. 결론
• References

참고문헌 (Reference)

1 G.P. Smith, "http://www.me.berkeley. edu/gri_mech/"

2 W.J. Sheu, "Upstream interactions between premixed flames" 110-111 : 1-17, 1995

3 S. H. Sohrab, "Theory of interactive combustion of counterflow premixed flames" 45 : 27-, 1986

4 X. Li, "Study on stretch extinction limits of CH4/CO2 versus high temperature O2/CO2counterflow nonpremixed flames" 161 : 1526-1536, 2014

5 M. Blocquet, "Quantification of OH and HO2 radicals during the low-temperature oxidation of hydrocarbons by Fluorescence Assay by Gas Expansion technique" 110 (110): 20014-20017, 2013

6 J. Kopyscinski, "Production of synthetic natural gas(SNG)1229from coal and dry biomass–a technology review from 1950 to 2009" 89 : 1763-1783, 2010

7 Y. Kang, "Mutually interacting SNG-air premixed flames" 2018

8 N. Peters, "Laminar flamelet concepts in turbulent combustion" 21 : 1231-1250, 1986

9 C. M. Vagelopoupos, "Laminar flame speed and extinction strain rates of mixtures of carbon monoxide with hydrogen, methane and air" 25 : 1317-1323, 1994

10 T. H. Kim, "Important role of chemical interaction on flame extinction in downstream interaction between stretched premixed H2-air and CO-air flames" 38 : 6537-6551, 2013

11 V.N. Konderatiev, "HO2 radicals in combustion reactions" 14 : 37-44, 1973

12 S. J. Lim, "Flame spread over electrical wire with AC electric fields: Internal circulation, fuel vapor-jet, spread rate acceleration, and molten insulator dripping" 162 : 1167-1175, 2015

13 T. M. Vu, "Effects of Hydrocarbon Addition on Celllar Instabilities in Expanding Syngas-air Spherical Premixed Flames" 34 : 6961-6969, 2009

14 T. M. Vu, "Effects of Diluent on Cellular Instabilities in Outwardly Propagating Spherical Syngas-air Premixed Flames" 35 : 3868-3880, 2010

15 J. S. Ha, "Effect of flame stretch in downstream interaction between premixed syngas-air flames" 36 : 13181-13193, 2011

16 T. H. Kim, "Downstream interaction between stretched premixed syngas-air flames" 104 : 739-748, 2013

17 K. S. Sim, "Downstream Interaction between SNG/air Premixed Flames" 210 : 545-556, 2017

18 C.K. Law, "Combustion Physics" Cambridge University Press 410-434, 2006

19 R. J. Kee, "Chemkin II: a fortran chemical kinetics package for analysis of gas phase chemical kinetics" Sandia National Laboratories 1989

20 "Chemical-Kinetic Mechanisms for Combustion Applications, San Diego Mechanism web page, Mechanical and Aerospace Engineering (Combustion Research)" University of California

21 C. K. Westbrook, "Chemical kinetic modeling of hydrocarbon combustion" 10 (10): 1-57, 1984

22 J. Park, "Chemical effects on added CO2 on the extinction characteristics of H2/CO/CO2 syngas diffusion flames" 4 : 38756-38762, 2009

23 S. Ishizuka, "An experimental study on extinction and stability of stretched premixed flames" 19 : 327-335, 1982

24 I. Yamaoka, "An experimental study of flammability limits using counterflow flames" 17 (17): 843-855, 1979

25 S. H. Sohrab, "An experimental investigation on flame interaction and the existence of negative flame speeds" 20 : 1957-1965, 1984

26 A. E. Lutz, "A fortran program for computing opposed flow diffusion flames" Sandia National Laboratories 1997

27 R.J. Kee, "A fortran computer code package for the evaluation of gas-phase multi-component transport" Sandia National Laboratories 1996

28 R. J. Kee, "A computational model of the structure and extinction of strained, opposed flow, premixed methane - air flames" 22 (22): 1479-1494, 1989

29 C.W. Zhou, "A Comprehensive e xperimental and modeling study of isobutene oxida tion" 167 : 353-379, 2016