Abstract
During spray combustion, the complex oxidizing atmosphere makes the direct experimental investigation of droplet evaporation and combustion challenging. Within this study, the effects of water vapor as well as the concentrations of oxygen and nitrogen in the atmosphere on the single isolated droplet combustion were experimentally investigated using a high-speed digital camera. An in-house made piezoelectric droplet-on-demand generator was employed to reproducibly generate single isolated monodispersed droplets with the diameter of around 100 µm. Three fuels with different boiling points and solubility in water were used. The results indicate that, increasing oxygen concentration promotes droplet combustion, and water vapor alters the droplet combustion depending on the fuel properties. The experimental values of the burning constant during the quasi-steady period were in agreement with the d2-law based theoretical calculations. The residuals from ethanol droplet combustion can be clearly observed, whose formation can be affected by the oxygen and water vapor in the atmosphere.
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