Investigation of Droplet Combustion Characteristics of Boron-based Nanofluid Fuels
Boron-based nanofluid fuels have high energy density and great potential for develop-ment.However,due to the lack of research on basic combustion characteristics like ignition delay and combustion behavior,the practical application of this fuel in engines has been limited.In this work,we set up a falling-droplet experiment system based on a multiple diffusion flat-flame combus-tor to investigate the ignition and combustion characteristics of boron-based(mass fraction 0～10％)ethanol droplets.We found that adding 5％boron particles decreased the ignition delay time of the ethanol droplets by 34.2％at 1400 K.The addition of boron particles led to micro-explosions,which happened earlier with the temperature increase.A droplet combustion model incorporating the radiation absorption mechanism was developed to quantify the significant increase in the burning rate.By comparing the model prediction with the measurements,we clarified that radiation alone cannot fully explain the improved burning characteristics of nanofluid fuels.
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