ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Reconstruction of three-dimensional refractive index field of premixed swirl combustion flame
Received date: 2021-10-08
Revised date: 2021-10-27
Accepted date: 2021-12-10
Online published: 2021-12-24
Supported by
National Natural Science Foundation of China(52176167);Natural Science Foundation of Jiangsu Province(BK20201279)
The structural parameters of the swirl combustors will affect the combustion process of the aeroengine combustion chamber. In order to obtain high-resolution three-dimensional flow field information， analyze the influence of the swirl combustors on the combustion performance of the combustion chamber and subsequently put forward optimization strategies， the Background Oriented Schlieren Tomography technique （BOST） can be used to reconstruct the instantaneous three-dimensional refractive index， density and temperature distribution of complex flows. First， the lens equivalent optical system and Runge-Kutta ray tracing method are used to simulate the distorted image caused by ray deflection. On this basis， the refractive index field of regular and complex objects is reconstructed using the optical flow equation reconstruction model. The influencing factors of image distortion are analyzed. The influence of measurement volume， focal length and other setting parameters on the reconstruction error is calculated. The optimized measurement setting method of background oriented schlieren is proposed. The simulation results show that the reconstructed refractive index field with optimized parameters show the complex flow field structures such as swirling jet， fold and vortex of turbulent swirling flame.
Zhihao LI , Biao ZHANG , Jian LI , Chuanlong XU , Zhaolong SONG . Reconstruction of three-dimensional refractive index field of premixed swirl combustion flame[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2023 , 44(4) : 126480 -126480 . DOI: 10.7527/S1000-6893.2021.26480
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