Tang Aikun

Numerical Simulation Study of Premixed Hydrogen-Oxygen Combustion Process in Micro-scale Rectangular Channel

Detailed 19-steps reaction mechanisms are adopted to simulate the combustion characteristics of premixed hydrogen-oxygen in a 3-dimensional rectangular micro channel, and inlet velocity, channel height and wall material are changed to further study the effects of these key factors on the micro-combustion. The results indicate that the premixed hydrogen-oxygen can realize stable combustion in sub millimeter rectangular channel in a wide velocity range, there action is rapid near the inlet and the structure of the flame core is cone-shaped. The three influential parameters all have effects on the temperature and length of flame, which causes the difference of steam mass fraction in the combustor. Adopting materials of smaller heat conductivity coefficient will result in larger nonuniformity of the temperature distribution on the out wall of the combustor and will affect its working intensity. The quenching distance of premixed hydrogenoxy gencombustion in the rectangular channel is less than0.2mm. The mixture can react adequately in this type of channel with the height of 0.2¡«0.8mm when the flux and the length are appropriate.