基于干涉粒子成像(IPI)的直喷汽油机喷雾场微观特性测量及关键技术研究

项目名称： 基于干涉粒子成像(IPI)的直喷汽油机喷雾场微观特性测量及关键技术研究

项目编号： No.61275019

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 无线电电子学、电信技术

项目作者： 吕且妮

作者单位： 天津大学

项目金额： 82万元

中文摘要： 探明直喷汽油机燃油喷射过程的燃油分布特性对内燃机燃烧研究具有重要意义。本课题拟结合激光干涉粒子成像(IPI)技术和粒子图像测速(PIV)技术，研究喷雾液滴粒子尺寸、速度、粒度分布、空间分布及气缸内空气速度等测量理论和技术，提出一种高密度高精度的粒子干涉条纹数/条纹间距提取算法，以及聚焦像位置提取算法，以解决高密度粒子场测量中重叠条纹图提取问题。提出一种基于IPI条纹变化研究液滴蒸发、聚合及破碎过程的光学诊断方法，研究粒子跟踪识别算法，研制适用于内燃机喷雾场测量的实验系统装置，开发自动、高速、高精度的IPI 图像处理软件包，尝试探索缸内直喷高速射流气液两相相互作用机理及喷雾液滴蒸发机理，为改善现有直喷系统喷雾微观特性及开发新型燃油直喷系统提供理论依据，为内燃机喷雾场测量提供一种诊断方法。这一研究成果将在内燃机喷雾特性研究、内燃机燃烧等方面具有重要的应用价值和广阔的应用前景。

中文关键词： 干涉粒子成像技术；闪急沸腾喷雾；数字图像处理；粒子尺寸速度测量；汽油缸内直喷

英文摘要： An insight into the fuel distribution characteristics of the fuel injection process of the direct injection gasoline engine is of great significance to studying combustion of the internal combustion engine. The subject aims at, which combines the interferometric particle imaging(IPI) with the particle image velocimetry(PIV) techniques, studying the theories and techniques concerning the measurement of droplet size, velocity, size distribution, spatial distribution and the in-cylinder air gas phase velocities,etc. The high-precision algorithm of extracting the number of fringers/fringe spacing of interferogram from high-density particle field is presented and the postion extracting method of the focused images is also proposed, to work out the problems extracting of overlapping images in high-density particle field. The optical method of diagnosing the the process of droplet vaporization, coalescence and breakup is presented by using the fringes change of interferogram, and an algorithm for tracking and identifying particles is studied. An experimental system setup for measuring the spray field of the internal combustion is developed; the high-precision high-speed automatic IPI image software packages are completed. The interactivity mechanism of liquid and gas in two phases and the evaporation mechanism of spray

英文关键词： interferometric particle imaging；flash boiling spray；digital imaging process；droplet diameter and velocity measurement；gasoline direct injection