Abstract

In this work, four samples of nanofluid fuel were prepared by sequentially blending bioethanol with 1 wt% aluminum (Al), 5 wt% Al, 10 wt% Al, and 5 wt% Al + 1 wt% oleic acid (OA). The stability and combustion characteristics of the samples were investigated. The experimental results show that the addition of OA had a beneficial effect on the stability of samples by preventing the formation and growth of Al agglomerates. Moreover, the sample containing OA showed the shortest normalized ignition delay time (0.015 s/mm2), the largest combustion rate constant (28.79 mm2/s), and the highest maximum surface temperature (932.60 °C) during combustion. The increase in solids' concentration is also helpful in improving the stability, ignition, and energy release of the samples within the studied ranges of the parameters. However, excessive solids' concentration enlarges the size of Al core during combustion and will further decrease the overall combustion efficiency.

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