苄基叠氮—正十六烷复合燃油蒸发特性试验研究
发布时间：2018-11-15 20:25
【摘要】：为了研究苄基叠氮复合柴油促进燃烧的机理，消除柴油多组分沸点差异性对液滴蒸发特性的影响，本研究将苄基叠氮化合物与正十六烷配制成不同配比的二元组分复合燃油，利用挂滴式单液滴高温蒸发试验装置，开展了苄基叠氮-正十六烷复合燃油蒸发特性及其影响规律的试验研究。 首先结合试验需求，搭建挂滴式单液滴高温蒸发试验装置，开发了基于Matlab的图像处理程序，实现了从单液滴图像序列中批量自动提取直径数据的方法，并通过对试验系统进行误差分析，验证了试验系统的精确度。围绕试验装置中重要的关键技术参数设置对液滴蒸发特性试验结果的影响，分别研究不同的热电偶直径、热电偶测端夹角、进入蒸发环境的速度对单液滴蒸发特性试验结果的影响规律，为试验装置关键参数设定提供了参考。 综合利用上述试验方法，分别对苄基叠氮化合物以及苄基叠氮-正十六烷复合燃油在常压下，以苄基叠氮化合物分解反应温度为界分别在高温和低温环境中，开展蒸发特性试验研究。结果显示，相比低温环境中，在高温环境中复合燃油液滴蒸发特性发生了质的变化，液滴内出现气泡生成和膨胀、以及连续喷气现象，可认为是由苄基叠氮化合物分解反应造成的。此外，通过开展复合燃油液滴在常压下的影响规律研究，，发现随着叠氮化合物质量分数、液滴初始直径、环境温度的增大，均能够在一定程度上提高液滴蒸发速率。
[Abstract]:In order to study the mechanism of benzyl azide compound diesel to promote combustion and eliminate the effect of multicomponent boiling point difference of diesel oil on the evaporation characteristics of liquid droplets, a binary compound fuel with different ratio of benzyl azide compound and cetane was prepared. The evaporation characteristics of benzyl azido-cetane compound fuel and its influence law were studied by using a single droplet high temperature evaporation test device. Firstly, according to the test requirements, a single droplet high temperature evaporation test device is built, and an image processing program based on Matlab is developed. The method of automatically extracting the diameter data from a single droplet image sequence in batches is realized. The accuracy of the test system is verified by error analysis. According to the influence of the important technical parameters on the test results of droplet evaporation characteristics, different diameters of thermocouple and the angle between the measured ends of the thermocouple are studied respectively. The influence of the speed of the evaporation environment on the experimental results of the evaporation characteristics of a single droplet provides a reference for setting the key parameters of the test device. Based on the above experimental methods, the decomposition temperature of benzyl azide compound and benzyl azido-n-cetane compound fuel were determined under atmospheric pressure, respectively, in high temperature and low temperature, respectively, with the decomposition temperature of benzyl azide compound as the boundary. Experimental study on evaporation characteristics was carried out. The results show that the evaporation characteristics of composite fuel droplets in the high temperature environment have changed qualitatively, the bubble formation and expansion have occurred in the droplet, and the continuous jet phenomenon has been observed. It is believed to be caused by the decomposition of benzyl azide compounds. In addition, it is found that with the increase of azide mass fraction, droplet initial diameter and ambient temperature, the droplet evaporation rate can be improved to a certain extent.
【学位授予单位】：北京理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE665
本文编号：2334359
[Abstract]:In order to study the mechanism of benzyl azide compound diesel to promote combustion and eliminate the effect of multicomponent boiling point difference of diesel oil on the evaporation characteristics of liquid droplets, a binary compound fuel with different ratio of benzyl azide compound and cetane was prepared. The evaporation characteristics of benzyl azido-cetane compound fuel and its influence law were studied by using a single droplet high temperature evaporation test device. Firstly, according to the test requirements, a single droplet high temperature evaporation test device is built, and an image processing program based on Matlab is developed. The method of automatically extracting the diameter data from a single droplet image sequence in batches is realized. The accuracy of the test system is verified by error analysis. According to the influence of the important technical parameters on the test results of droplet evaporation characteristics, different diameters of thermocouple and the angle between the measured ends of the thermocouple are studied respectively. The influence of the speed of the evaporation environment on the experimental results of the evaporation characteristics of a single droplet provides a reference for setting the key parameters of the test device. Based on the above experimental methods, the decomposition temperature of benzyl azide compound and benzyl azido-n-cetane compound fuel were determined under atmospheric pressure, respectively, in high temperature and low temperature, respectively, with the decomposition temperature of benzyl azide compound as the boundary. Experimental study on evaporation characteristics was carried out. The results show that the evaporation characteristics of composite fuel droplets in the high temperature environment have changed qualitatively, the bubble formation and expansion have occurred in the droplet, and the continuous jet phenomenon has been observed. It is believed to be caused by the decomposition of benzyl azide compounds. In addition, it is found that with the increase of azide mass fraction, droplet initial diameter and ambient temperature, the droplet evaporation rate can be improved to a certain extent.
【学位授予单位】：北京理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE665
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