| Traditional automotive engines need to search for efficient combustion modes and clean alternative fuels for the gradually serious environmental problem.Biomass resources,which are a renewable energy and widely distributed in China,can be converted into liquid or gaseous fuels by a series of chemical methods.These fuels have great potential to apply into traditional gasoline or diesel engines.In this paper,the research objects are the main components of a kind of refining biomass pyrolysis oil by straw conversion,namely ethanol,acetone and ethyl acetate.In order to make better use of these fuels,the laminar burning characteristics of the three kinds of fuel and their mixed fuel are investigated by experiment and simulation:1.The laminar burning experiments are conducted at 358 K and 1 atm conditions in the constant volume combustion bomb with the high-speed Schlieren imaging technology for 18 kinds of fuel,namely ethanol,acetone,ethyl acetate and the mixed fuels.Every fuel is investigated with 8 different equivalence ratios,from 0.7-1.4.By measuring the flame front area of recorded Schlieren images with the help of PhotoShop software,unstretched flame propagation speed can be extrapolated with nonlinear extrapolation method.Then the laminar burning characteristics parameters,which include laminar burning speed,laminar burning flux,laminar flame thickness,Markstein length and Markstein number,are deduced and analyzed.2.Using the Premix module of Chemkin software,the temperature distribution,paths and sensitivity of reaction of the one-dimensional flame combustion process of ethanol,acetone,ethyl acetate are analyzed with Marinov mechanism,Pichon mechanism and Dyama mechanism,respectively.Then the calculated laminar burning speeds are compared with the experimental data. |
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