基于多紫外相机的旋流火焰三维锋面层析重建
收稿日期: 2022-11-29
修回日期: 2022-12-24
录用日期: 2023-01-10
网络出版日期: 2023-02-01
基金资助
国家自然科学基金(51976038);江苏省自然科学基金(BK20201279)
3D front tomographic reconstruction of swirl flame by ultraviolet multi-camera imaging
Received date: 2022-11-29
Revised date: 2022-12-24
Accepted date: 2023-01-10
Online published: 2023-02-01
Supported by
National Natural Science Foundation of China(51976038);Natural Science Foundation of Jiangsu Province(BK20201279)
旋流火焰锋面可表征火焰宏观结构和燃烧稳定性，其瞬态三维结构测量对旋流燃烧机理研究和旋流燃烧器优化设计具有重要意义。提出一种基于多紫外相机成像的测量方法，构建了基于多紫外相机阵列的化学发光层析成像（Computed Tomography of Chemiluminescence， CTC）系统，实现了低成本、高准确度的旋流火焰瞬态锋面化学发光信息获取；发展了基于预识别技术的联合代数重建算法（Simultaneous Algebraic Reconstruction Technique， SART），通过光线追踪识别零强度体素，从而减少计算量和重建伪影。开展了数值模拟研究，以验证重建算法的准确性和抗噪性。最后搭建了甲烷-空气预混旋流燃烧实验台，开展了基于多紫外相机的化学发光成像系统标定和低旋流火焰锋面特性实验研究。结果表明，旋流火焰锋面反投影重建精度达到0.97以上，同时计算量减小了59.6%；稳定燃烧工况下，低旋流火焰在喷嘴出口处扩张，锋面呈现涡旋状的碗形结构；随着当量比的增大，火焰推举高度略有上升，火焰体积逐渐增大，燃烧稳定性增强。
倪浩伟 , 刘国炎 , 周毅 , 张彪 , 柳伟杰 , 许传龙 . 基于多紫外相机的旋流火焰三维锋面层析重建[J]. 航空学报, 2023 , 44(18) : 128331 -128331 . DOI: 10.7527/S1000-6893.2022.28331
The front of swirl flame can be used to characterize the flame macrostructure and combustion stability， making its transient 3D structure measurement extremely important for research on the swirl combustion mechanism and swirl burner optimization. A measuring approach for the transient 3D front of swirl flame by ultraviolet multi-camera imaging is proposed. In order to acquire transient chemiluminescence information at a low cost with high precision， a Computed Tomography of Chemiluminescence （CTC） system based on ultraviolet multi-camera array is built. Additionally， the Simultaneous Algebraic Reconstruction Technique （SART） is improved using a pre-recognition method for non-intensity voxels identification by ray tracing， resulting in less computational load and reconstruction artifacts. Numerical simulation experiments are executed to confirm the accuracy and noise immunity of the reconstruction algorithm. A methane-air premixed swirl combustion experimental rig is built finally， and the calibration of the ultraviolet multi-camera imaging system and low-swirl flame front experiments are carried out. The results show that the accuracy of the inverse projection exceeds 0.97 while the calculation is reduced by 59.6%. The low swirl flame expands at the nozzle exit under stable combustion conditions and displays a vortex bowl-shaped structure. In addition， the flame pushing height rises slightly as the equivalent ratio grows， and the flame volume gradually increases as well， which enhances combustion stability.
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