脉冲激光全息技术探测柴油机喷雾方法的研究

Holographic Diagnostics for Diesel Spray Research

在柴油机喷雾全息观测系统上,研究了脉冲激光全息技术探测柴油机喷雾的方法,并着重探讨了同轴全息微粒场密度极限、大密度微粒场全息测量、雾场燃油浓度分析及雾场二维和三维显示等测试问题。文中成功地测量了柴油机喷雾油滴尺寸、频数分布和燃油浓度,实现了喷雾内部构造的可视化,发现和认识了一些新的雾化现象,为柴油机喷雾模型构筑和燃烧过程的研究提供了重要依据。

This paper presents investigation on the application of laser holo- graphy to diesel spray research. A laser holographic and data processing system for diesel spray have been developed. The holographic methods investigated include in-line, off-axis holography and laser shadowgraphy and their capability for recording diesel spray events is demonstrated. The concer- ning problems in diesel spray research including limit to particle field den- sity, dense particle field analysis, fuel concentration measurement, two and three dimensional spray visualization are explored and discussed. As a result, new laser holographic methods useful to diesel spray research from different aspects have been proposed. Based on investigation, information on disinte- grating process, droplet size distribution and fuel-air mixture formation in diesel spray from holographic analysis will greatly help to promote spray modeling and combustion research.