Surface Area Analysis of Methane Flame Propagating in Straight Tube

• Main Authors: Yi-ChengLee, 李翊呈
• Other Authors: Hsiao-Feng Yuan
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/7f2d3j

碩士 === 國立成功大學 === 航空太空工程學系 === 106 === The major combustible components from gasification of biomass are hydrogen (H2), carbon monoxide (CO) and methane (CH4). In order to fully utilize the gasified products, an understanding of the combustion characteristics of the product mixtures is crucial. Laminar flame speed is one of the important properties to characterize fuel gas burning for combustion chamber design as well as in the simulation of turbulent flame propagation. This thesis research focuses on the combustion of the mixtures of CH4 CO. By using a self-designed tube method, the flame propagation speeds along the tube are measured by photodiode. Coupled with the flame area estimation by the time-gap measurements of flame front arrival at different position at the same cross section, the laminar flame speed can be deduced. At different equivalence ratios (∅=0.85,1.0,1.15) and different mixing ratios of Methane and carbon monoxide, the laminar flame speeds are researched and compare with that in the literature. From error analysis, the uncertainty of the developed tube method for flame speed measurement is between 5 to 10%. The experimental results show that the flame propagation speeds and the deuced laminar speed increase with the amount of carbon monoxide addition until near 85%CO. Higher CO addition decreases the flame speed. Comparing with that in the literature, the measured flame speeds are slightly lower, however possesses the same trend variation, that indicates the reliability of the developed tube measurement method.