Abstract
Since both ethanol and acetone are the main components in many alternative fuels, research on the burning characteristics of ethanol-acetone blends is important to understand the combustion phenomena of these alternative fuels. In the present study, the burning characteristics of ethanol-acetone fuel blends are investigated at a temperature of 358 K and pressure of 0.1 MPa with equivalence ratios ranging from 0.7 to 1.4. Ethanol at 100% vol., 25% vol. ethanol/75% vol. acetone, 50% vol. ethanol/50% vol. acetone, 75% vol. ethanol/25% vol. acetone, and 100% vol. acetone are studied by the constant volume combustion chamber (CVCC) method. The results show that the laminar burning velocities of the fuel blends are between that of 100% vol. acetone and 100% vol. ethanol. As the ethanol content increases, the laminar burning velocities of the mixed fuels increase. Furthermore, a detailed chemical kinetic mechanism (AramcoMech 3.0) is used for simulating the burning characteristics of the mixtures. The directed relation graph (DRG), DRG with error propagation (DRGEP), sensitivity analysis (SA), and full species sensitivity analysis (FSSA) are used for mechanism reduction. The flame structure of the skeletal mechanism does not change significantly, and the concentration of each species remains basically the same value after the reaction. The numbers of reactions and species are reduced by 90% compared to the detailed mechanism. Sensitivity and reaction pathway analyses of the burning characteristics of the mixtures indicate that the reaction C2H2+H(+M)<=>C2H3(+M) is the key reaction.
Highlights
With the rapid development of the automotive industry, increasing numbers of gasoline and diesel vehicles have produced serious air pollution worldwide [1,2]
The numbers of reactions and species are reduced by 90% compared to the detailed mechanism
Ethanol and acetone are the main components [15,16], so their fundamental combustion characteristics should be well known for their application in gasoline and diesel engines and other burning apparatus
Summary
With the rapid development of the automotive industry, increasing numbers of gasoline and diesel vehicles have produced serious air pollution worldwide [1,2]. It is urgent to find efficient and clean alternative fuels, such as bioethanol [4,5,6], methanol [7,8,9,10], dimethyl ether [11], and acetone-butanol-ethanol (ABE) [12,13,14]. Ethanol and acetone are the main components [15,16], so their fundamental combustion characteristics should be well known for their application in gasoline and diesel engines and other burning apparatus. There are few studies on the fuel blends of ethanol and acetone. The fundamental combustion of acetone and ethanol has been studied separately in the literature. Some studies have investigated the combustion characteristics of ethanol and acetone blends with other fuel.
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