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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。
Based on the gas-particle two-phase flow, the combustion characteristics of supersonic flame spraying with pure oxygen, air and oxygen-air combined combustion were calculated by using FLUENT software. The results show that the combustion of pure oxygen is full while the temperature of flame is high, but the increase of oxygen mass flow has little effect on the temperature of flame. When air is used for combustion, the flow of air is large, resulting in high pressure in the combustion chamber. When the oxygen content increases, the highest temperature reached by the flame stream is higher, but when the oxygen content reaches a certain percentage, it can completely replace the pure oxygen combustion. The oxygen content in the combustion gas indirectly affects the combustion Product composition distribution.