不同助燃条件下超音速火焰喷涂的燃烧特性  

Combustion characteristics of high velocity oxy-fuel spraying under different combustion-supporting conditions

作　　者：王引真[1] 张永昂[1] 孙玉伟 冯涛[1] 

机构地区：[1]中国石油大学(华东)机电学院,山东青岛266580 [2]西南油气田安全环保与技术监督研究院,四川成都610041

出　　处：《材料热处理学报》2013年第3期165-169,共5页Transactions of Materials and Heat Treatment

基　　金：中国石油大学(华东)研究生创新基金(11CX06064A)

摘　　要：运用FLUENT软件,在气体-颗粒两相流基础上,计算了纯氧气、空气、氧-空气联合助燃3种情况下超音速火焰喷涂的燃烧特性。结果表明:纯氧气助燃时燃烧充分,焰流温度高,但氧气质量流量增加对焰流温度影响很小;空气助燃时所用空气流量大,导致燃烧室压力大,故适宜喷涂低熔点、易氧化粉末材料;氧-空气联合助燃时,氧气含量越大,焰流能达到的最高温度越高,但当氧气含量达到一定比例后可完全替代纯氧助燃;助燃气体中氧气含量的不同间接影响燃烧产物成分分布。On the basis of gas-powder two-plase flow, combustion characteristics of high velocity oxy-fuel spraying were calculated by FLUENT software. Three different combustion-supporting conditions, pure oxygen, air and oxygen/air gas, were taken into account in the calculation. Results indicate that on the condition of pure oxygen, combustion is sufficient and temperature is relatively high while the increase of oxygen mass flow rate has little effect on flame temperature. In case of the air condition, high air mass flow rate results in high pressure in combustion chamber, which is appropriate for spraying oxidizable powder with low melting point. As for the oxygen/air gas condition, the highest flame temperature rises with the increasing ratio of oxygen, and it can replace pure oxygen to support combustion for the ratio of oxygen increasing to a certain degree. Also, different oxygen ratios indirectly affect the component of combustion products.

关 键 词：超音速火焰喷涂 助燃条件 燃烧特性 两相流 

分 类 号：TG174.442[金属学及工艺—金属表面处理]