Abstract
A numerical method was employed to simulate kerosene with a bio-oil additive derived through a fast pyrolysis process in a model for spray combustion flow field. The influences of various oxidizer velocities and proportions of the bio-oil additive on kerosene spray combustion were investigated. The results indicate that for the kerosene with the bio-oil additive, an increase in the oxidizer velocity decreased and intensified the spray combustion regime mainly because an increase in the spray angle reduced the unit area of the droplets, and the turbulence increased the mixing of fuel and oxidizer. The kerosene spray combustion regimes with the bio-oil additive were reduced when the proportion of the additive was increased, mainly because the bio-oil was derived from the biomass in a fast pyrolysis process; specifically, the condense temperature influenced the volatility of the bio-oil components. Compared with pure kerosene, the volatile bio-oil underwent early vaporization into fuel vapor; this resulted in an early reaction after mixing with the oxidizer and an indirect early kerosene reaction, thereby contributing to the decrease in the kerosene spray combustion regime with the bio-oil additive. Because the heating value of the bio-oil was low, the addition of excessive bio-oil reduced the combustion efficiency.
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