Electric field-regulating combustion behavior of biodiesel droplet
Droplet combustion in an electric field is the research basis of electrostatic spray combustion.An experimental setup of fuel droplet combustion in the electric field is constructed.The combustion behavior of the biodiesel droplet is investigated by using the visualization method.The effects of electric field strength on flame and droplet morphologies as well as the droplet combustion law are discussed.The results show that the competition between the electric field force and natural buoyancy determines the flame morphology.As the electric field intensity increases,upward flames,quasi-spherical flames and downward flames appear one after another.It manifests that the upper flame height decreases,the lower flame height increases,the flame width first increases and then decreases,the flame front area first decreases and then increases,and their maximum change amplitudes are 69.9%,243.1%,17.0%and 10.9%respectively.As the flame front is the reaction area between fuel vapor and oxygen,increasing the electric field strength leads to a successive increase and decrease in the combustion duration of the droplet with a maximum variation of 18.1%.
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