微波瓣燃烧器的燃烧特性

Combustion Characteristics of Micro-lobed Burner

采用三维仿真方法对微波瓣燃烧器、环形圆柱燃烧器的流动及燃烧情况进行了模拟,研究了甲烷与氧气的不同当量比对燃烧器燃烧特性的影响规律.结果表明:微波瓣燃烧器中流向涡的存在及甲烷同氧气混合面积的增加有助于燃料同氧化剂的混合,从而强化燃烧,提高燃烧效率及燃烧温度.此外,虽然微波瓣燃烧器的燃烧温度、燃烧效率在不同当量比下始终高于环形圆柱燃烧器,但随着当量比的减小,两者在相同位置处气体的温差及燃烧效率之差随之减少.

A 3D simulation method was used to simulate the flow and combustion of micro-lobed burner and splitter burner,and the influence law of equivalence ratio between methane and oxygen on combustion characteristics was studied.The results showed that the streamwise vortices and augmentation in the mixing area between methane and oxygen could improve the mixing between fuel and oxidant,which can thus strengthen combustion to increase the combustion efficiency and temperature.Besides,although the combustion efficiency and temperature of micro-lobed burner are higher than that of the splitter burner,the combustion temperature and efficiency differences between these two burners at the same position go down as equivalence ratio decreases.