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Temperature Measurement Based on Background Oriented Schlieren

Author: LvXiaoLiang
Tutor: ZhouZuo；ZuoKeFa；QiuKunZan
School: Zhejiang University
Course: Thermal Power Engineering
Keywords: Background schlieren Bunsen burner flame Temperature field Iterative Reconstruction Temperature boundary layer
CLC: TK113
Type: Master's thesis
Year: 2011
Downloads: 185
Quote: 0
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Abstract


This paper describes the background of traditional Schlieren Schlieren techniques and technology, the basic principles and methods, review their use in combustion , heat and mass transfer , wind tunnel tests and other related fields, and analyzes the background schlieren technique and traditional schlieren technology compared to the advantages and disadvantages . Schlieren technique using a background made ??reconstruction of flame temperature . To reconstruct temperature field, obtained by testing the presence of temperature gradient background speckle images and there is no temperature gradient background speckle images using particle image processing software image on two cross-correlation analysis, background particles strike the offset that obtained after the light through the temperature field on the camera projection deflection angle . The acquired data in any aspect iterative reconstruction deflection angle to strike this section of the refractive index distribution , according to Gass formulas and gas state equation is solved to obtain an arbitrary section of the temperature distribution , the results will be rebuilt and spectral inversion method comparing the measured temperature field and temperature field distribution line with the actual situation . In this paper, the background schlieren technique studied transverse tube in the case of natural convection boundary layer temperature distribution , the test tube using Fluent software to get around the flow field and temperature boundary layer buoyancy approximate distribution obtained based on the numerical simulation of the temperature boundary layer and the background schlieren pattern iterative mesh , and then three-dimensional reconstruction of the temperature boundary layer to achieve a natural convection case transverse tube quantitative measurement of the temperature boundary layer . For the experiments and engineering applications of observation and measurement of the temperature boundary layer provides a simple and practical way .

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CLC: > Industrial Technology > Energy and Power Engineering > Thermal engineering, heat > Heat > Heat measurement
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