Density and temperature reconstruction of a flame-induced distorted flow field based on background-oriented schlieren (BOS) technique

doi:10.1088/1674-1056/26/6/064701

中国物理B ›› 2017, Vol. 26 ›› Issue (6): 64701-064701.doi: 10.1088/1674-1056/26/6/064701

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇下一篇

Density and temperature reconstruction of a flame-induced distorted flow field based on background-oriented schlieren (BOS) technique

Guang-Ming Guo(郭广明), Hong Liu(刘洪)

School of Aeronautics and Astronautics, Shanghai Jiao Tong University, Shanghai 200240, China

收稿日期:2016-11-10 修回日期:2017-02-06 出版日期:2017-06-05 发布日期:2017-06-05
通讯作者: Guang-Ming Guo E-mail:guoming20071028@163.com
基金资助:
Project supported by the Key Program of the National Natural Science Foundation of China (Grant No. NSFC 91441205).

Density and temperature reconstruction of a flame-induced distorted flow field based on background-oriented schlieren (BOS) technique

Guang-Ming Guo(郭广明), Hong Liu(刘洪)

School of Aeronautics and Astronautics, Shanghai Jiao Tong University, Shanghai 200240, China

Received:2016-11-10 Revised:2017-02-06 Online:2017-06-05 Published:2017-06-05
Contact: Guang-Ming Guo E-mail:guoming20071028@163.com
Supported by:
Project supported by the Key Program of the National Natural Science Foundation of China (Grant No. NSFC 91441205).

摘要/Abstract

摘要： An experimental system based on the background-oriented schlieren (BOS) technique is built to reconstruct the density and temperature distribution of a flame-induced distorted flow field which has a density gradient. The cross-correlation algorithm with sub-pixel accuracy is introduced and used to calculate the background-element displacement of a disturbed image and a fourth-order difference scheme is also developed to solve the Poisson equation. An experiment for a disturbed flow field caused by a burning candle is performed to validate the built BOS system and the results indicate that density and temperature distribution of the disturbed flow field can be reconstructed accurately. A notable conclusion is that in order to make the reconstructed results have a satisfactory accuracy, the inquiry step length should be less than the size of the interrogation window.

关键词: background-oriented schlieren, density reconstruction, finite difference methods, distorted flow field

Abstract: An experimental system based on the background-oriented schlieren (BOS) technique is built to reconstruct the density and temperature distribution of a flame-induced distorted flow field which has a density gradient. The cross-correlation algorithm with sub-pixel accuracy is introduced and used to calculate the background-element displacement of a disturbed image and a fourth-order difference scheme is also developed to solve the Poisson equation. An experiment for a disturbed flow field caused by a burning candle is performed to validate the built BOS system and the results indicate that density and temperature distribution of the disturbed flow field can be reconstructed accurately. A notable conclusion is that in order to make the reconstructed results have a satisfactory accuracy, the inquiry step length should be less than the size of the interrogation window.

Key words: background-oriented schlieren, density reconstruction, finite difference methods, distorted flow field

中图分类号: (General theory in fluid dynamics)

47.10.-g

47.11.Bc (Finite difference methods) 07.60.-j (Optical instruments and equipment)

郭广明, 刘洪. Density and temperature reconstruction of a flame-induced distorted flow field based on background-oriented schlieren (BOS) technique[J]. 中国物理B, 2017, 26(6): 64701-064701.

Guang-Ming Guo(郭广明), Hong Liu(刘洪). Density and temperature reconstruction of a flame-induced distorted flow field based on background-oriented schlieren (BOS) technique[J]. Chin. Phys. B, 2017, 26(6): 64701-064701.

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Density and temperature reconstruction of a flame-induced distorted flow field based on background-oriented schlieren (BOS) technique

Density and temperature reconstruction of a flame-induced distorted flow field based on background-oriented schlieren (BOS) technique

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