Laminar Burning Velocity of Ethanol, Acetaldehyde and Ethanol-Acetaldehyde Flames

Abstract: The objective of this study is to get new experimental data regarding to the burning velocities of ethanol, acetaldehyde and their mixture which has been performed by the heat flux method. It is known that the heat flux method for determination of laminar burning velocities is an efficient technique since the burning velocity can be determined directly, without applying extrapolations. These laminar burning velocities of the fuel -air mixture were measured by this method at ambient pressure, various temperatures and several ranges of equivalence ratios. The ethanol-acetaldehyde solutions have previously not been studied; therefore there is no literature available for comparison. The results were only compared to modeled burning velocities by Marinov mechanism which has been implemented hereon by CHEMKIN software. There is inconsistency between the modeled and the measured results of ethanol-acetaldehyde mixture while computing the burning velocities. There is limited literature date available for comparison of the present study of acetaldehyde which has been measured at various temperatures and equivalence ratio; whereas, all results of the shape of the curvatures the graphs have shown the same behaviors and the maximum velocity for each temperature under study. Also, the results of acetaldehydes are compared against each other at different temperature and with the modeling results and the previous result. At last, the relationship between the temperature of the unburnt gas and laminar burning velocity has been studied to see their linear behavior. The power exponents have been determined as a function of equivalence ratio. The burning velocity of the ethanol and acetaldehyde show fairly good agreement with previous and modeled results