Numerical Simulating For The Kerosene Combustion In Porous Medium

Energy is one of the most essential elements for human beings, and plays a significant role inthe development of the society and the economics. As the needs of liquid fuels such as petroleumand the crisis of environmental problems, it is more and more important and realistic to think aboutthe problems of how to make use of the fuels efficiently. With Porous Media Technology, we canuse our liquid fuels more efficiently and clean. Based on the program（Y1090313）supported byScientific Funds of Zhejiang Province, the thesis studies efficient combustion of the liquid keroseneby numerical stimulations methods and then investigate the combustions characteristics of liquidkerosene in free environment and porous media. The work of paper does is as the following:Firstly, the paper makes a mathematical model of straight tube burner. The Straight tubeburners can be research which is commonly used in engineering and deal with Gas-liquidtwo-phase turbulent effect by K-εmodel. Then we apply Non-premixed combustion model of themean mixture factions/DPF equation to study the possess of the kerosene combustion, and buildup mathematical models of the combustion of liquid kerosene in free environment and porousmedia, considering Kerosene spray and particle motions possess, Kerosene droplet evaporationprocess, and assuming the local balance between the gas and solid, neglecting the radiation ofsolid and liquid. Based on the models, and the Fluent Software, we make numerical stimulation ofthe possession after the liquid kerosene is ejected into the burning burner and burning burner withporous media in it.The numerical stimulations of the characteristics of kerosene combustion flame in freeenvironment. We analysis the dynamic possession of the characteristic of combustion andtemperature of combustion flame, by considering excess air ratio, injection angle, gas preheatingtemperature, droplet diameter of the continuous phase and discrete phase of the combustiontemperature distribution, the concentration component distribution effects. The results show that thefactors such as droplet diameter, gas preheating temperature, and the excess air ratio, whichinfluence the factors such as the time and location which have direct influence to the ignitionprocess.More the changes with the factors above will bring more changes of our results.The numerical stimulations of the characteristics of kerosene combustion flame in porousmedia. We analyze the distribution and rules of the changes of combustion velocity in porous media,and then compare with the results in free environment. The results show that the existence of theporous media improves the combustion flame distribution, expand the range of flame temperatureand higher the downstream temperature of the combustion zone, so that we can recycle the heats ofexhaust more effectively and reduce lose of heats. The paper provide a prerequisite of the study of complex turbulent combustion and detailedchemical reaction problems, so as to the porous media pre-mixing combustion theory and providesreference for the design of the burner.