| In order to study the reason of diesel-azidesblends promoting rapid combustion,eliminate the influence of different boiling pointsof diesel multiple components on dropletevaporation characteristics，benzyl azides were chosen as a fuel additive blended withhexadecane. The vaporization characteristics of azides-hexadecane blends were studied byusing a hanging droplet vaporization characteristics test device which can provide hightemperature environment. The influence of key parameterson droplet vaporizationcharacteristics was studied too.Conbined with test requirements, a hanging droplet vaporization characteristics testdevice was designed as main tool of the whole study.The image processing programbasedon matlab, by which the droplets diameter data can be canculated automatically, wasdeveloped. The test system error was analysed to confirm its reliability. The diameter ofthermocouple, the end angle of thermocouple, and thespeed of droplet going into the hoteviroment, as key parameters of the test device which can influent the droplet vaporizationcharacteristics, were studied to provide reference for device settings.Using the test methods above, the vaporization characteristics of benzyl azidesdroplets and azides-hexadecane blends dropletswere tested under nomal pressure anddifferent vaporization temperatures. The results showed that，whilein a high temperatureenvironment, the blend droplets had different vaporization charateristics. Bubble generationand expansion, and the continuous jet were recordedby high speed camera, which can beconsidered to be caused by benzyl azides decomposition reaction. In addition, the resultsofthe influence law test research showed that, with the increase of azides mass fraction, theinitial droplet diameter, the environment temperature, the droplet evaporation rate increasedin a certain degree. |
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