Study On Combustion Characteristics Of A Three Step Rearward Micro-combustor And Its Field Synergy Analysis

Nowadays, Micro devices have been used a lot in almost all fields, such as electronic products, automobile, aviation, aerospace, military, medicine, environmental monitoring, etc. So far, micro devices still mainly rely on the traditional chemical batteries. Compared with batteries, hydrocarbon fuel with higher energy density is more environmentally friendly. So the micro power system based on combustion is the most promising power source of micro devices. But when the burner is reduced to the micro scale, there are many new problems. The impact of the surface heat loss to the environment increases sharply. The fuel ignition and stable combustion becomes extremely difficult within the limited space. Due to the complex structure of the micro-combustor, there are many difficulties in the producing process. These problems restrict the development an d application of micro-combustor directly.This paper is based on the program—stable combustion mechanism of the porous media micro-combustor and its applications [201208430262], which is supported by the China Scholarship Council. Combining numerical simulation with experimental testing, the influencing factors on combustion characteristics of micro-combustor were deeply researched and analyzed. The main work and innovations are as follows:(1) A three step rearward facing configuration based micro channel combustor was chosen. The physical, mathematical and chemical kinetics model of micro-combustor was built. The effect of changes in flow rates, mixture equivalence ratio, gas initial temperature and convective heat transfer coefficient on combustion characteristics of the three step micro-combustor was investigated with numerical simulation.(2) The effect of changes in flow rates, mixture equivalence ratio, gas initial temperature and convective heat transfer coefficient on heat transfer characteristics of the three step micro-combustor was analyzed by the field synergy principle.(3) Experimental investigations were carried out to verify combustion characteristics of the three step micro-combustor. It turned out that the calculated results agree with the experimental data essentially.