The Combustion Performance Optimization And Numerical Simulation Of Micro Combustor

The micro combustor is one of important parts of micro thermophotovoltaic(MTPV) system, MTPV system power output is mainly from the radiation energy,which absorb by Photovoltaic Cells (PV cells), of the micro combustor outside-wall.The thermal conversion efficiency of the micro combustor determines the MTPVsystem working performance is good or bad. The micro combustor used thehydrocarbon compounds which are widely distributed in nature as the fuel; and it alsohas a lot of advantages, such as simple construction, large energy density, high energyconversion efficiency, etc. The firing effect of foam ceramic porous media is betterthan ceramic balls porous media in the micro combustor, porous media porosity is toobig or too small are not conducive to the occurrence of burning, the increased ofmixture flow improved the micro combustor wall temperature to a certain extent.In this paper the micro combustor working performance were investigated undervarious influence factors. The radiation wall temperature distribution and spectralproperties of the micro combustor were also investigated and analyzed by changing thestructure of the porous media, porosity, mixture flow and mixing ratio, etc.In order to analyze the HC and CO content of the micro combustor exhaust andmake sure that it can meet the relevant requirements, the exhaust collection systemwas used on the outlet of the micro combustor in this paper. Through the exhaustcollection and analysis of the micro combustor under different working conditions(such as different mixture flow, porosity, mixing ratio, etc.) to find out the bestworking condition which has a high energy conversion efficiency and a low pollutantdischarged. HC and CO content of the micro combustor exhaust is connected withcombustion state of micro combustor, HC and CO content are firstly decreases andthen increases with the increased of mixture flow. The influence of porosity on thesetwo harmful ingredients is relatively complex.Due to the limitation of test equipment, a lot of working conditions cannot be used on the bench test, and the internal combustion state and each componentconcentration distribution also cannot be measured. In order to analyze the impact ofthese factors on the micro combustor working state, the method of CFD simulationwas used in this paper. The Fluent software is used to establish the reasonable microcombustor physical model, and has simulated the working state of the microcombustor in more conditions and the situation of the internal combustion reaction.Combining with the experimental results, this paper analyzed the influence of variousfactors on the micro combustor working state. And those studies have achieved goodresults, which consequently would point out the direction for future research of themicro combustor.