Four-dimensional measuring method of pulsating flame based on optical deflection tomography

Abstract

The invention relates to a pulse flame four-dimensional measurement method based on deflectometric chromatography. The method provided by the invention can be used to form a 4D-CT multi-visual angle projection ordered array deflection imaging system, and an optimal sampling angle can be determined according to structural characteristics of a detected flow field, and after beam expanding and collimation of a laser beam emitted by a laser source and spatial filtering, a beam splitter can be used for secondary beam splitting to generate a plurality of projection beams, and then a Moire deflection strip array can be generated. Based on the strip pattern processing technology of the wavefront reconstruction, the light deflection information of the projection strips can be extracted. The compressive sensing reconstruction algorithm based on the deflection angle correction reconstruction can be used for the back calculation, and the two-dimensional parameter distribution of different strip pattern cross sections can be acquired. By adopting the single threshold segmentation method for the threshold segmentation of the reconstructed two-dimensional temperature distribution, and adopting the Visualization Tool Kit technology based on the Marching Cubes surface drawing algorithm and the Ray Casting volume drawing algorithm, the three-dimensional volume data dynamic display of the pulse combustion flow field and the flame structure can be realized.

Description

technical field [0001] The invention belongs to the application field of laser technology, and in particular relates to a four-dimensional measurement method of a pulsating flame based on light deflection tomography. Background technique [0002] Pulsating combustion is a contemporary advanced unconventional combustion technology. It refers to a special combustion in which state parameters such as temperature, pressure, air velocity and heat release rate fluctuate periodically with time under the condition of mutual excitation and feedback of combustion and acoustic pulsation. Unstable combustion process. Pulsating combustion has the incomparable advantages of conventional stable combustion such as high combustion intensity, high heat transfer efficiency, and low NOx emissions. It is of great significance for saving energy, controlling pollutant emissions, and researching high-efficiency power machinery. China and many European countries attach great importance to it. Howe...

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Problems solved by technology

However, the reconstruction under extremely under-sampled conditions still cannot meet the requirements of high-precision measurement of turbulent combustion with complex structures

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