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

作　　者：郭广明 刘洪 

机构地区：[1]School of Aeronantics and Astronautics, Shanghai Jiao Tong University, Shanghai 200240, China

出　　处：《Chinese Physics B》2017年第6期203-212,共10页中国物理B（英文版）

基　　金：supported by the Key Program of the National Natural Science Foundation of China(Grant No.NSFC 91441205)

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.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 

分 类 号：O35[理学—流体力学]