Reconstruction of three-dimensional refractive index field of premixed swirl combustion flame

被引：0
|
作者：
Li Z. [1 ]
Zhang B. [1 ]
Li J. [1 ]
Xu C. [1 ]
Song Z. [1 ]
机构：
[1] National Engineering Research Center of Power Generation Control and Safety, School of Energy and Environment, Southeast University, Nanjing
来源：
Hangkong Xuebao/Acta Aeronautica et Astronautica Sinica | 2023年 / 44卷 / 04期
基金：
中国国家自然科学基金;
关键词：
3D reconstruction; aeroengine; background oriented schlieren tomography technique; refractive index; swirl combustor;
D O I：
10.7527/S1000-6893.2021.26480
中图分类号：
学科分类号：
摘要：
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 opti⁃ mization 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 mea⁃ surement 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 re⁃ constructed refractive index field with optimized parameters show the complex flow field structures such as swirling jet，fold and vortex of turbulent swirling flame. © 2023 AAAS Press of Chinese Society of Aeronautics and Astronautics. All rights reserved.
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