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Experimental investigation on microstructure behavior of premixed methane-air flame-flow interaction in a semi-vented chamber

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Journal of Beijing Institute of Technology 2011年第3期20卷 301-305页

作者：任少峰王玉杰陈先锋陈明 School of Natural Resources and Environmental Engineering Wuhan University of Technology

To explore the premixed methane-air flame microstructure behavior and the flame-flow interaction, the premixed methane/air flame was studied in a semi-vented chamber. A high speed camera and schlieren images methods were used to record the processes of interaction between rare- faction wave and flame. Meanwhile, a pressure sensor was utilized to catch the pressure variation in the process of flame propagation. The experiment results showed that the interference of rarefaction wave on flame caused the flame front structure change, which led to the flame transition from lami- nar to turbulent quickly. The rarefaction wave intervened in the flame by turning the flame front sur- face into dentiform structure. The violent turbulent combustion began to appear in part of the flame front and spreaded to the whole flame front surface. The rarefaction also decreased the flame propa- gation speed.

关键词： methane-air flame micro-structure flame propagation laminax-turbulent combustion

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A numerical investigation of CO2 dilution on the thermochemical characteristics of a swirl stabilized diffusion flame

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Applied Mathematics and Mechanics(English Edition) 2020年第2期41卷 327-348页

作者： S.VAKILIPOUR Y.TOHIDI J.AL-ZAILI R.RIAZI Faculty of New Sciences and Technologies University of TehranNorth Kargar StreetTehranIran Department of Mechanical Engineering University of ManitobaWinnipegMB R3T 5V6Canada Department of Mechanical Engineering&Aeronautics CityUniversity of LondonNorthampton SquareLondon EC1V 0HBU.K.

The turbulent combustion flow modeling is performed to study the effects of CO_2 addition to the fuel and oxidizer streams on the thermochemical characteristics of a swirl stabilized diffusion flame. A flamelet approach along with three well-known turbulence models is utilized to model the turbulent combustion flow field. The k-ω shear stress transport(SST) model shows the best agreement with the experimental measurements compared with other models. Therefore, the k-ω SST model is used to study the effects of CO_2 dilution on the flame structure and strength, temperature distribution, and CO concentration. To determine the chemical effects of CO_2 dilution, a fictitious species is replaced with the regular CO_2 in both the fuel stream and the oxidizer stream. The results indicate that the flame temperature decreases when CO_2 is added to either the fuel or the oxidizer stream. The flame length reduction is observed at all levels of CO_2 dilution. The H radical concentration indicating the flame strength decreases, following by the thermochemical effects of CO_2 dilution processes. In comparison with the fictitious species dilution, the chemical effects of CO_2 addition enhance the CO mass fraction. The numerical simulations show that when the dilution level is higher, the rate of the flame length reduction is more significant at low swirl numbers.

关键词： swirl stabilized flame CO2 dilution methane-air chemical effect turbulent flame structure steady flamelet model

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Experimental and numerical evaluations on characteristics of vented methane explosion

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Journal of Central South University 2020年第8期27卷 2382-2393页

作者： SU Bin LUO Zhen-min WANG Tao LIU Lang School of Safety Science&Engineering Xi’an University of Science and TechnologyXi’an 710054China School of Energy Xi’an University of Science and TechnologyXi’an 710054China

To research the characteristics of vented explosion of methane-air mixture in the pipeline,coal mine tunnel or other closed space,the experiments and numerical simulations were carried *** this work,explosion characteristics and flame propagation characteristics of methane in pipeline and coal mine tunnel are studied by using an explosion test system,combined with FLACS software,under different vented *** numerical simulation results of methane explosion are basically consistent with the physical experiment results,which indicates that the numerical simulation for methane explosion is reliable to be applied to the *** results show that explosion parameters(pressure,temperature and product concentration)of methane at five volume fractions have the same change ***,the explosion intension of 10.0%methane is the largest and that of 9.5%methane is relatively weak,followed by 11.0%methane,8.0%methane and 7.0%methane *** different vented conditions,the pressure and temperature of methane explosion are the highest in the pipeline without a vent,followed by the pipeline where ignition or vent position is in each end,and those are the lowest in the pipeline with ignition and vent at the same *** is no significant effect on final product concentration of methane explosion under three vented *** coal mine tunnel,it is indicated that the maximum explosion pressure at the airproof wall in return airway with the branch roadway at 50 m from goaf is significantly decreased while that in intake airway does not change *** addition,when the branch roadway is longer or its section is larger,the peak pressure of airproof wall reduces slightly.

关键词： methane-air flame propagation CFD simulation vented explosion ignition position peak pressure

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