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对于柴油机而言,燃油的喷射、雾化及其与空气的混合是整个燃烧过程的1个关键环节。近年来,由于对燃油选择和燃烧排放的要求越来越严格,采用光学可视化技术对内燃机中燃油的喷雾发展和燃烧的研究也越来越多。本文阐述了复合激光诱导荧光(Planar Laser Indueced Exciplex Fluorescence Technique,PLIEF)技术用于喷雾可视化的基本原理及测量气液两相浓度时的标定技术,测量方法是通过荧光剂对柴油中轻重组分的追踪。结合研究实例中典型的试验重点介绍了复合激光诱导荧光技术在喷雾可视化研究中的应用情况,包括喷雾浓度场和温度场的复合激光诱导荧光测量和喷雾中气液两相的复合激光诱导荧光测量。但是,柴油喷雾中,复合激光诱导荧光技术的局限性和结果的准确性仍然具有争议性,本文对此进行了分析。
For diesel engines, the injection of fuel, atomization and mixing with the air is a key part of the combustion process. In recent years, due to the increasingly stringent requirements on fuel selection and combustion emissions, more and more studies have been made on the development and combustion of fuel in an internal combustion engine using optical visualization technology. In this paper, the basic principle of PLIEF for spray visualization and the calibration technique for the measurement of gas-liquid two-phase concentration are described. The measuring method is to measure the concentration of light and heavy components track. In combination with the typical experimental examples, the application of the composite laser-induced fluorescence technique in spray visualization is mainly introduced, including composite laser-induced fluorescence measurement of spray concentration field and temperature field and composite laser-induced fluorescence measurement of gas-liquid two-phase in spray . However, the limitations of the composite laser-induced fluorescence technique and the accuracy of the results in the diesel fuel spray are still controversial. This paper analyzes this.