Experimental study on exponential evaporation rate model of several liquid fuels

Accurate gas-liquid two-phase mass transfer relationship is required for combustion chamber design. In this paper a micro high speed camera was adopted to measure the suspended droplet evaporation in an electrical heating furnace. The quantitative evaporation rate relationship of five kinds of liquid fuels, such as ethanol, kerosene etc. was obtained with various ambient temperature and gas phase component. The test method was verified by experimental data and the maximum relative error is less than 5%. The experimental data comparison showed that there is notable difference with the commonly used two phase mass transfer law in the combustion chamber working temperature range. In this paper, an exponential evaporation rate model was proposed. Compared with experimental values, the standard error(SE) of aviation kerosene and other fuels' model value is under 0.23. This model can be helpful for liquid fuel combustor design.