Abstract
Computed tomography of a chemiluminescence (CTC) system was implemented to provide time-resolved 3D measurements of an unconfined turbulent swirl flame. This system was designed in a cost-effective manner and employed three customized view registration assemblies to simultaneously capture eight projections of the target flame at a repetition rate of 4 kHz. Both time-resolved and time-averaged tomographic reconstructions were performed based on data acquired for a duration of 250 ms. Both qualitative and quantitative validations suggested the correctness of our implementation. The time-resolved instantaneous reconstructions successfully captured the evolution of the structural features of the swirl flame such as local extinctions and the helical mode. Based on the reconstructions, the centroids of chemiluminescence for all the layers were calculated. The trajectory of these centroids provided insights into the flow motion and suggested a rotating helical structure of the swirl flame. These results demonstrated the feasibility of resolving the dynamics of turbulent swirl flames with a kHz temporal resolution using the relatively inexpensive CTC system.
© 2018 Optical Society of America
Full Article | PDF ArticleMore Like This
Khadijeh Mohri, Simon Görs, Jonathan Schöler, Andreas Rittler, Thomas Dreier, Christof Schulz, and Andreas Kempf
Appl. Opt. 56(26) 7385-7395 (2017)
Hecong Liu, Tao Yu, Man Zhang, and Weiwei Cai
Appl. Opt. 56(25) 7107-7115 (2017)
Ying Jin, Wanqing Zhang, Yang Song, Xiangju Qu, Zhenhua Li, Yunjing Ji, and Anzhi He
Opt. Express 27(19) 27308-27334 (2019)