Hydrogen/oxygen premixed combustion characteristics in micro porous media combustor

摘要

The micro-combustor is a major component of the micro-TPV system. For improving the stability and work efficiency of micro thermophotovoltaic conversion device, porous media combustor was designed. Porous media can increase flame stability and gain higher conversion efficiency compared with free flame combustor. With numerical simulation, effects of several major parameters on micro combustion, namely material of porous media, hydrogen to oxygen equivalence ratio, porosity and mixture flow rates were investigated. The results indicated that these four parameters have great influence on micro-combustor. With the appropriate parameters, micro combustor with porous media structure could greatly increase combustion efficiency. The newly designed porous media combustor has a high external wall average temperature, and has a lower temperature gradient than free flame combustor, which is more suitable for the optimization and improvement of micro-TPV conversion device.