| With the increasing consumption of fossil fuel and deteriorating environment,the development of renewable and clean alternative fuels is the main research objective in the field of internal combustion engine.As an important part of renewable energy,biomass energy is the only one which can be directly converted into carbon liquid fuel.After rapid pyrolysis and modification of some biomass raw materials such as straw,the biomass pyrolysis oil with application prospect in internal combustion engine can be produced.Because the biomass pyrolysis oil contains hundreds of organic chemical compositions which can not be experimentally analyzed directly,researchers usually choose several typical components to reproduce the surrogate in experimental studies.The surrogate has the similar physiochemical properties with biomass pyrolysis oil.Laminar burning velocity is an important parameter of fuel.It has an irreplaceable effect on the researches of turbulent combustion,chemical kinetic mechanism and engine structure optimization design.In this essay,the research object is a kind of biomass pyrolysis oil derived from rice husk.The author uses ethanol,ethyl acetate,diethyl ether,acetone and 2-butanone to reproduced the surrogate mixture,and investigates the laminar burning characteristics of this mixture by experiment and simulation.The main contents are as followed:(1)The experiments are conducted at the constant volume combustion chamber test platform,,under initial temperatures of 358,388,418 K,initial pressures of 0.1,0.2,0.4 MPa and an extensive range of equivalence ratios(0.7-1.4).Using high-speed Schlieren photography technique to record the process of flame propagation,and calculating some important parameters such as laminar burning velocity,Markstein length,flame thickness,mass burning flux and so on.The factors that cause the flame instability are explained,and the variation of flame instability under different initial conditions is analyzed combining flame images.(2)Using the Premixed module of Chemkin software and available chemical kinetic models to respectively simulate the laminar burning process of the above-mentioned five components.Investigating the sensitivity of reactions,flame structures,free radical concentration changes in flame,laminar burning velocities for different fuels,equivalence ratios,initial temperatures and pressures. |
