Performance of Background Oriented Schlieren with different background patterns and image processing techniques

Vinnichenko, Nikolay A.; Pushtaev, Aleksei V.; Plaksina, Yulia Yu.; Uvarov, A. V.

doi:10.1016/j.expthermflusci.2023.110934

Experimental Thermal and Fluid Science

2023

DOI: 10.1016/j.expthermflusci.2023.110934

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Performance of Background Oriented Schlieren with different background patterns and image processing techniques

Nikolay A. Vinnichenko

Aleksei V. Pushtaev

Yulia Yu. Plaksina

et al.

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Cited by 9 publications

References 35 publications

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Heterodyne background-oriented schlieren for the measurement of thermoacoustic oscillations in flames

Tasmany,

Kaiser,

Woisetschläger

et al. 2024

Exp Fluids

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In aircraft engines, thermoacoustic oscillations in the combustion chamber contribute significantly to noise emissions, which, like all other emissions, must be drastically reduced. Thermoacoustic oscillations are not only a concern, they can also be beneficial in hydrogen combustion. This work demonstrates that thermoacoustic density oscillations with amplitudes at least an order of magnitude smaller than those resulting from density gradients in a turbulent flame can be detected using laser interferometric vibrometry. This improvement was made possible by heterodyning a carrier fringe system in background-oriented schlieren (BOS) recordings, which were subsequently analyzed using techniques commonly used for holographic interferometry. In comparison with other BOS evaluation techniques, the filtering of the individual frames in the Fourier domain offers a more efficient computational approach, as it allows for phase averaging of a high number of single recordings to reduce noise from turbulence. To address fringe pattern distortions and cross talk in the Fourier domain, which both have been observed by other authors, we propose background subtraction methods and an optimized background pattern. Additionally, the procedure provides a visualization tool for marking the high turbulence regions of heat release by the variations in fringe amplitude. Finally, the line-of-sight data are reconstructed using the inverse Abel transform, with the data calibrated by laser interferometric techniques, resulting in local values for density oscillations. Graphical abstract

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Heterodyne background-oriented schlieren for the measurement of thermoacoustic oscillations in flames

Tasmany,

Kaiser,

Woisetschläger

et al. 2024

Exp Fluids

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show abstract

Reconstruction of turbulent flow from temperature field measured using Background Oriented Schlieren

Rudenko,

Vinnichenko,

Pushtaev

et al. 2024

International Journal of Thermofluids

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Measurement of the concentration distribution of hydrogen jets using adaptive stream stripe- background oriented schlieren (ASS-BOS)

Miao,

Jia,

Hua

et al. 2024

International Journal of Hydrogen Energy

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Performance of Background Oriented Schlieren with different background patterns and image processing techniques

Cited by 9 publications

References 35 publications

Heterodyne background-oriented schlieren for the measurement of thermoacoustic oscillations in flames

Heterodyne background-oriented schlieren for the measurement of thermoacoustic oscillations in flames

Reconstruction of turbulent flow from temperature field measured using Background Oriented Schlieren

Measurement of the concentration distribution of hydrogen jets using adaptive stream stripe- background oriented schlieren (ASS-BOS)

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