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

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.

Keywords: background-oriented schlieren density reconstruction finite difference methods distorted flow field

Received: 10 November 2016
Revised: 06 February 2017
Accepted manuscript online:

PACS:	47.10.-g	(General theory in fluid dynamics)
	47.11.Bc	(Finite difference methods)
	07.60.-j	(Optical instruments and equipment)

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

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

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