ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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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 |
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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.
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Received: 10 November 2016
Revised: 06 February 2017
Accepted manuscript online:
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PACS:
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47.10.-g
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(General theory in fluid dynamics)
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47.11.Bc
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(Finite difference methods)
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07.60.-j
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(Optical instruments and equipment)
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Fund: Project supported by the Key Program of the National Natural Science Foundation of China (Grant No. NSFC 91441205). |
Corresponding Authors:
Guang-Ming Guo
E-mail: guoming20071028@163.com
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Cite this article:
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 2017 Chin. Phys. B 26 064701
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