Study On The Characteristics And Field Synergy Of Hydrogen Non-premixed Micro-scale Stable Combustion

At present,micro-power system based on micro-scale combustion has broad application prospects in military and civilian fields of micro-devices,and the process of micro-scale combustion has been paid more and more attention by many researchers.Micro-scale combustion has the advantages of high energy efficiency,low pollution and simple structure,however,there are still many challenges,such as short residence time and large loss of dispersion.Therefore,the research of micro scale combustion process characteristics and research on strengthening combustion method have a certain significance of rich combustion theory and efficient micro power system development.This paper contains the expansion and contraction of the cylindrical structure of the micro hydrogen and air combustor in non premixed combustion was simulated.The influence of different physical parameters on hydrogen micro scale combustion characteristics were analyzed.The intensified combustion measures for the combustor model in this paper were explored.Finally,the field synergy analysis of the combustion region was carried out by using the field synergy principle.It lays a foundation for the subsequent optimization design of micro-combustion.Specific papers and innovations are as follows:(1)The physical model of micro-scale combustor and the mathematical model and combustion dynamics model of hydrogen/air non-premixed combustion were established.The effects of the structure parameters of combustor,the inlet velocity of hydrogen and air,and the wall material parameters of combustor on the micro-scale combustion performance of hydrogen were studied and obtained.(2)The factors affecting stable combustion of cylindrical micro-scale burner with sudden expansion and gradual contraction structure in the inlet section were studied.The effects of hydrogen inlet velocity on combustion efficiency and combustion stability of micro-scale combustion were obtained when the air inlet velocity is constant,which provides a theoretical basis for solving the problems of poor gas mixing and insufficient oxygen in the burner.(3)The field synergy theory were used to analyze the steady combustion process in micro-combustor.The effects of the inlet velocity of hydrogen,the initial incident temperature of hydrogen and oxygen,and the thermal conductivity of wall materials on the synergy between the velocity field and the temperature gradient field of heatflow in the steady combustion process in micro-combustor were obtained.