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首页> 外文期刊>Journal of Thermal Science and Technology >Development of Ultra-Micro Combustor Using Cylindrical Flames
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Development of Ultra-Micro Combustor Using Cylindrical Flames

机译：圆柱火焰超微型燃烧器的研制

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The purpose of this study is to develop an ultra-micro combustor that uses two types of coaxial cylindrical flames, rich premixed flame and diffusion flame. The combustor consists of inner and outer porous tubes, and rich propane-air mixture and air issued, respectively, through the inner tube outwardly and through the outer tube inwardly, forming a cylindrical stagnation plane sandwiched by the inner rich premixed flame and the outer diffusion flame. Petal type flame was also observed in the downstream of the cylindrical flames. Keeping the equivalence ratio φ_(i) and flow rate q_(i) of the rich mixture constant, air flow rate q_(a) was varied. The O_(2) and CO concentrations and temperature of the burnt gas were measured, and heat loss rate η_(hl) and combustion intensity L were evaluated. The obtained results are described as follows. (1)The relation curve of η_(hl) with the overall equivalence ratio φ_(all) , which is evaluated from the total flow rate of the fuel and the air, has a minimum value. (2)The relation curve of the minimum value of η_(hl) with L has a minimum value. (3) The CO concentration of the burnt gas increases as q_(a) is increased because of local extinction of the petal type flame. (4)When q_(a) is increased further, petal type flame is also extinguished. After that, the O_(2) concentration increases and the CO concentration decreases.
机译：这项研究的目的是开发一种超微型燃烧器，该燃烧器使用两种类型的同轴圆柱状火焰：浓预混火焰和扩散火焰。燃烧室由内，外多孔管组成，富丙烷-空气混合物和空气分别通过内管向外和向内通过外管发出，形成一个圆柱状停滞平面，该停滞平面被内部富预混合火焰和外部扩散夹在中间火焰。在圆柱形火焰的下游也观察到花瓣型火焰。保持浓混合气的当量比φ_（i）和流量 q_（i）恒定，改变空气流量 q_（a）。测量O_（2）和CO浓度以及燃烧气体的温度，并且评估热损失率η_（hl）和燃烧强度 L。获得的结果描述如下。 （1）根据燃料和空气的总流量求出的总当量比φ_（all）的关系曲线η_（hl）为最小值。 （2）η_（hl）的最小值与 L的关系曲线具有最小值。 （3）由于花瓣型火焰的局部熄灭，随着Iq_（a）的增加，燃烧气体的CO浓度增加。 （4）进一步增加q_（a）时，花瓣状的火焰也被熄灭。之后，O_（2）浓度增加而CO浓度减少。

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