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在自行研制的水雾协流管式燃烧器的基础上,利用高速纹影实验系统对水雾协流作用下层流预混火焰燃烧速度、火焰拉伸以及熄火规律进行了实验研究,分析其现象产生过程与机理,得到了不同浓度甲烷预混火焰临界熄火时火焰拉伸率与燃烧速度的变化规律.结果表明,管式燃烧器预混火焰面拉伸与燃料浓度、混合气体流量以及水雾雾滴直径有关;对于较大粒径的细水雾,水雾载荷比越小,火焰面拉伸现象越明显;Le>1的富燃料预混火焰,当水雾载荷比较小时,燃烧速度越大的预混火焰更容易发生回火;而Le<1的贫燃料预混火焰,在相同水雾条件下,预混气体浓度越小,火焰就越容易产生熄脱.
On the basis of self-developed water mist co-current tube burner, the experimental research on laminar premixed flame combustion speed, flame stretch and flameout under the influence of water mist co-flow was carried out on the basis of high-speed pattern test system. The process and mechanism of the flame were obtained.The variation law of flame elongation and burning rate at the time of the critical flameout of methane premixed flame with different concentrations was obtained.The results showed that the flame spread and the fuel concentration of the premixed flame and the flow of the mixed gas and water mist For the larger size water mist, the smaller the water mist load ratio, the more obvious the flame surface tension phenomenon; the fuel rich premix flame with Le> 1, when the water mist load is relatively small, the burning speed Large pre-mixed flame is more likely to temper; and Le <1 lean fuel premixed flame in the same water mist conditions, the lower the concentration of the premixed gas, the more likely the flame flame out.