Research On Laminar Flame Characteristics Of Ethanol-Acetone-air Mixture

As the shortage of fossil fuel and enviroment problems caused by over-using it, to develop clean renewable energy has become one of the most important concerns in worldwide, and biomass fuel is one of the most promising alternative fuels. To develop biomass fuel by pyrolysis technology is one of the national basic research programs.As the mass fraction of alcohols and ketones contained in pyrolysis oil is up to 20%, so it is important to perform experiments on their burning characteristics. Laminar burning characteristics of ethanol-air mixture and acetone-air mixture were studied experimentally and computationally in a spherical explosion bomb, so as to the ethanol-acetone-air mixtures.1.By using high-speed schlieren photography, the flame propagation process of ethanol-air mixture and acetone-air mixture with equivalence ratio range from 0.7 to 1.6 in a spherical explosion bomb was recorded at initial gas mixture temperatures of 358 K and 0.1 MPa. The flame radiis were extracted by using a kind of extract method based on acreage to improve accuracy. Linear and nolinear extrapolation method were adopted to caculate laminar burning velocity, other combustion characteristics including mass burning velocity, Markstein length and flame thickness were also analysed.2.Laminar burning velocities of ethanol-air and acetone-air mixture at different equivalence ratio were simulated by Chemkin gas phase chemical kinetics software, and results were compared with other researchers to validate the reliability of experimental apparatus and data processing methods.3.The influences of acetone content in ethanol-acetone-air mixtures to its laminar burning characteristics were analysed in spherical explosion bomb. Results show that laminar burning velocities of ethanol-acetone-air mixtures reach max values at equivalence ratio 1.1 and increase with acetone content, but Markstein lengths show a decreased trend which illustrate that the flame structure become stable with acetone content increased.