摘要
三维层析方法通过相机采集待测信号在空间各方向上的二维投影,利用层析算法重构其三维空间分布,具有时空分辨能力,是测量和评估发动机缸内扩散和燃烧的新兴技术。为了使该方法能适用于受限空间,我们通过光线逆向追踪法和斯涅尔折射定律建立受限空间内待测信号和投影之间的映射关系,开发了三维跨界面层析算法。本文使用该算法对连续变化的受限空间内喷雾信号进行了重构实验,并计算出了喷雾表面曲率、速度以及其间的耦合关系。
Three-dimensional(3D)tomography is a new technology for measuring and evaluating in-cylinder diffusion and combustion by collecting the 2D projections of the signal to be measured on all orientations of the space then reconstructing its 3D spatial distribution using the tomography algorithm.In order to apply this method into confined-space,we establish the mapping relationship between the signal and the projections in confined-space by using reverse ray-tracing method and Snell’s refraction law,and develop a 3D cross-interface tomography algorithm.In this paper,the algorithm is used to reconstruct the vapor signal in the confined-space with continuous changes,and calculate the 3D surface curvature,velocity,and the coupling relationship between them.
作者
凌晨
陈海岩
伍岳
LING Chen;CHEN Haiyan;WU Yue(School of Mechanical Engineering,Beijing Institute of Technology,Beijing 100081,China)
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2024年第1期271-278,共8页
Journal of Engineering Thermophysics
基金
国家自然科学基金资助项目(No.51906017)缸内喷雾结构的跨界面高精度三维层析测量方法研究。
关键词
层析
扭曲修正
三维曲率
表面速度
tomography
distortion correction
3D curvature
surface velocity
