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      • The effects of temperature on evaporation and coking of gasoline droplets on a hot surface

        ( Haoyi Song ),( Jin Xiao ),( Xinqi Qiao ),( Dehao Ju ),( Zhen Huang ) 한국액체미립화학회 2017 한국액체미립화학회 학술강연회 논문집 Vol.2017 No.-

        The gasoline direct injection engine faced a much severe injector deposits problem compared with PFI engine because the nozzle of GDI injector was designed to extrude into the combustion chamber and had to be directly exposed to the high temperature combustion gas. The internal deposit formation in the injector nozzle can both restrict the fuel flow and alter the spray characteristics of the injectors, which will lead to the loss in power and fuel economy, as well as the increase of exhaust emissions. Thus it is of great significance to learn about the formation mechanism of these deposits. It’s acknowledged that the internal deposits derived from the oxidation of the remaining gasoline after injection at a relatively low temperature, generally lower than 200 °C. In this paper, a special facility was designed to investigate the evaporation and coking behavior of gasoline droplets. In the experiments, 10ml of gasoline dropped one by one droplet onto a hot surface which was heated to a certain temperature. The evaporation processes of the droplets were observed by high speed camera and the components of gasoline droplet as well as those of the remaining after coking were also examined. What’s more, the accurate qualities of deposits after coking at different temperature were measured to identify the influence of coking temperature on the amount of deposits formation. Results showed that the droplets evaporated as a ball on the hot surface at a temperature of about 5 °C lower than the final boiling point of the gasoline, which meant that it reached the gasoline’s Leidenfrost temperature. Besides, the qualities of deposits after coking increased with the increase of surface temperature firstly and then decreased and it increased again and then decreased as the surface temperature closed to its Leidenfrost temperature.

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