光路遮挡下的三维层析诊断精度最优化方法研究  

Accuracy Optimization of Three-Dimensional Tomography Under Partially Blocked Optical Paths

作　　者：吴海丰 高宇 伍岳 Wu Haifeng;Gao Yu;Wu Yue(School of Mechanical Engineering,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]北京理工大学机械与车辆学院,北京100081

出　　处：《燃烧科学与技术》2022年第5期556-562,共7页Journal of Combustion Science and Technology

基　　金：国家自然科学基金青年基金资助项目(51906017);北京市自然科学基金面上项目(3222041);天津大学内燃机燃烧学国家重点实验室开放课题资助项目(K2021-07).

摘　　要：三维层析成像技术具有非侵入性以及高时空分辨率的特点,已被证明是燃烧诊断领域尤其是发动机诊断的有力工具.但由于实际的发动机燃烧室内部结构复杂,在实际测量过程中,可能存在燃烧室内的零部件对火焰信号的光路遮挡现象,影响相机测量和层析重构精度.本文提出了一种在被测空间内存在光路遮挡条件下的三维层析算法,并根据待测体积微元数量和各微元的观测相机数对相机排布进行优化,实现光路遮挡下的重建精度最优化,并通过数值模拟方法证明了优化方法的有效性.Three-dimensional tomography has been proved to be a powerful tool in the field of combustion diagnostics,especially in the engine-related diagnostics,because of its non-invasive nature and high temporal and spatial resolution.However,due to the complex internal structure of industrial engine combustion chambers,the optical path may be partially blocked by the mechanical parts inside the chamber during the practical measurement,which influences camera measurement and degrades the tomographic reconstruction accuracy.In this paper,an improved three-dimensional tomography algorithm is proposed under the condition of optical path partially blocked.Besides,to achieve the optimal reconstruction accuracy under this condition,the camera arrangement is optimized according to the number of volume elements to be calculated and the number of observation cameras for each volume element.The effectiveness of the optimization method is validated by numerical simulation.

关 键 词：燃烧诊断 三维层析 相机排布优化 

分 类 号：TK11[动力工程及工程热物理—热能工程]