In this study, mixed fuel droplets of ethyl alcohol and biodiesel with different volumes or ratios were prepared and the related expansion, injection and micro-explosion phenomena were investigated. During the tests, a mixed-fuel droplet was hung on a high-temperature-resistant Cr-Ni wire, which was transported to the preheating piston for heating and then was ignited automatically. Micro-needles and an infusion set also were employed to prepare mixed droplets with identical ratios but different volumes. Using a single-lens-reflex (SLR) camera, colour videos that captured the combustion process of the mixed droplets were taken and were processed into colour images using Adobe Premiere Pro CC. The colour image series were analysed to determine the ignition delay time, the burnout time and the flame characteristics during combustion of mixed droplets with different ratios. Instantaneous grey images were obtained by means of high-speed photography during combustion of the mixed droplets with different volumes and different ratios, and of droplets of E40 (in which the volume ratio of ethyl alcohol was 40%). Using Image pro plus and Origin software, the variation of normalised mean droplet diameter with time over the whole combustion cycle was calculated and the underlying reasons for various combustion phenomena were analysed.

中文翻译：

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乙醇和生物柴油混合燃料液滴全燃烧循环过程中的膨胀、喷射和微爆现象

在这项研究中，制备了不同体积或比例的乙醇和生物柴油混合燃料液滴，并研究了相关的膨胀、喷射和微爆炸现象。试验过程中，混合燃料液滴挂在耐高温铬镍丝上，输送到预热活塞加热，然后自动点火。还使用微针和输液器制备具有相同比例但不同体积的混合液滴。使用单镜头反光 (SLR) 相机拍摄捕捉混合液滴燃烧过程的彩色视频，并使用 Adob​​e Premiere Pro CC 处理成彩色图像。分析彩色图像系列以确定点火延迟时间，不同比例混合液滴燃烧过程中的燃尽时间和火焰特性。不同体积、不同比例的混合液滴和E40（其中乙醇的体积比例为40%）液滴在燃烧过程中通过高速摄影获得瞬时灰度图像。使用 Image pro plus 和 Origin 软件，计算了整个燃烧循环中归一化平均液滴直径随时间的变化，并分析了各种燃烧现象的根本原因。