【摘要】：為了研究芐基疊氮復合柴油促進燃燒的機理，消除柴油多組分沸點差異性對液滴蒸發(fā)特性的影響，本研究將芐基疊氮化合物與正十六烷配制成不同配比的二元組分復合燃油，利用掛滴式單液滴高溫蒸發(fā)試驗裝置，開展了芐基疊氮-正十六烷復合燃油蒸發(fā)特性及其影響規(guī)律的試驗研究。 首先結合試驗需求，搭建掛滴式單液滴高溫蒸發(fā)試驗裝置，開發(fā)了基于Matlab的圖像處理程序，實現(xiàn)了從單液滴圖像序列中批量自動提取直徑數(shù)據(jù)的方法，并通過對試驗系統(tǒng)進行誤差分析，驗證了試驗系統(tǒng)的精確度。圍繞試驗裝置中重要的關鍵技術參數(shù)設置對液滴蒸發(fā)特性試驗結果的影響，分別研究不同的熱電偶直徑、熱電偶測端夾角、進入蒸發(fā)環(huán)境的速度對單液滴蒸發(fā)特性試驗結果的影響規(guī)律，為試驗裝置關鍵參數(shù)設定提供了參考。 綜合利用上述試驗方法，分別對芐基疊氮化合物以及芐基疊氮-正十六烷復合燃油在常壓下，以芐基疊氮化合物分解反應溫度為界分別在高溫和低溫環(huán)境中，開展蒸發(fā)特性試驗研究。結果顯示，相比低溫環(huán)境中，在高溫環(huán)境中復合燃油液滴蒸發(fā)特性發(fā)生了質的變化，液滴內出現(xiàn)氣泡生成和膨脹、以及連續(xù)噴氣現(xiàn)象，可認為是由芐基疊氮化合物分解反應造成的。此外，通過開展復合燃油液滴在常壓下的影響規(guī)律研究，，發(fā)現(xiàn)隨著疊氮化合物質量分數(shù)、液滴初始直徑、環(huán)境溫度的增大，均能夠在一定程度上提高液滴蒸發(fā)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.
【學位授予單位】：北京理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TE665

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