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题名	多孔介质表面火焰特性及其稳定性实验研究; Experimental Studies for the Combustion
作者	王勇
学位类别	硕士
答辩日期	2009-05-31
授予单位	中国科学院广州能源研究所
授予地点	广州能源研究所
导师	赵黛青
关键词	微燃烧器 多孔介质 平面火焰 点火距离 熄火距离
其他题名	Experimental Studies for the Combustion
中文摘要	The premixed flat flame formed on the porous surface has advantages such as stable combustion, thin flame front, low flame height and low temperature of the wall, which makes it suitable for organizing combustion in narrow space. In order to design a high-performance micro-combustor whose chamber wall is made of porous material, which had been designed and studied experimentally in our primary work, it's necessary to investigate the characteristics of combustion stability and flame structure of porous surface flame thoroughly. The formation characteristics and combustion stability of methane/air premixed flames on porous wall surface had been investigated experimentally. For the flat flame of millimeter size, a digital image processing method based on Matlab software was used to analyze flame image. The flame height and thickness were obtained accurately based on the linear relationship between image grey value and flame temperature. According to the comparison of the flame morphology and structure characteristic of the porous surface flame, it has been clarified that the flat flame has the lowest flame height and thickness. This thesis focuses on the limited conditions for flat flame formation and the influence factors, including equivalence ratio (), mixture flow velocity (υ), initial temperature of the mixture, porous wall characteristic, and the wall thickness. Meanwhile, the smallest distance for stable combustion in a limited space was investigated. The conclusions are as follows: (1) For fuel-lean condition, the range of mixture flow velocity for flat flame formation decreased with the decrease of equivalence ratio. This range could be expanded by preheating the mixture to higher initial temperature. With the increase of flow velocity and equivalence ratio, the temperature of flat flames increased and the flames moved closer to wall with a decrease of flame height. However, the temperature of wall surface could still keep at a low level. (2) The thermal conductivity of the material for porous wall has significant effect on flames at low flow velocity. The smaller thermal conductivity and the thicker of porous wall, the lower wall temperature was. (3) A temperature-controlled copperplate which paralleled to porous wall surface was used to simulate the wall of combustor. The range of smallest special scale for a stable combustion was defined based on the characteristics of igniting distance and quenching distance.
语种	中文
公开日期	2011-07-14 ; 2011-07-15
页码	61
内容类型	学位论文
源URL	[http://ir.giec.ac.cn/handle/344007/5858]
专题	中国科学院广州能源研究所
推荐引用方式 GB/T 7714	王勇. 多孔介质表面火焰特性及其稳定性实验研究, Experimental Studies for the Combustion[D]. 广州能源研究所. 中国科学院广州能源研究所. 2009.

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