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为了解微小燃烧室的工作特点,建立了微细直管的实验系统,采用氧气和甲烷气体进行了2种混合比的燃烧实验,实时采集壁面的温度分布。同时考虑微细直管内的燃烧、流动,以及与外界的换热,采用三维数值模拟方法对该微细直管燃烧室进行了数值计算,数值模拟结果与实验结果比较一致。研究结果表明:微细直管的内径较小,充分燃烧需要很长的微细直管;微细直管与外界的换热量很大,占总燃烧放热的40%左右,其中辐射换热量最大,占总换热量的70%,燃烧室需要采用低发射率的材料来减小辐射散热损失。
In order to understand the working characteristics of the micro-combustion chamber, an experimental system of the micro-straight pipe was established. Combustion experiments of two kinds of mixing ratio were conducted with oxygen and methane gas to collect the temperature distribution of the wall in real time. At the same time, considering the combustion, flow and heat exchange with the outside, the three-dimensional numerical simulation method was used to calculate the micro-straight tube combustion chamber. The numerical simulation results are in good agreement with the experimental results. The results show that the diameter of the fine straight tube is small, and the long straight tube is required for full combustion. The fine straight tube has a large heat exchange with the outside, accounting for about 40% of the total exothermic heat, of which the radiation heat transfer is the largest , Accounting for 70% of the total heat exchange, the combustion chamber needs to use low emissivity materials to reduce radiation heat loss.