Online Cross-Sectional Monitoring of a Swirling Flame Using TDLAS Tomography

Abstract

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Toward Customized Spatial Resolution in TDLAS Tomography

“…The laser beam can be deflected through an angle of 216 mrad at a repetition rate of 90 kHz using an electro-optic deflector [15]. Furthermore, stationary TDLAS tomographic sensors have been designed with multi-photodiode arrays [16,17] or fiber optics [8], in which the spatial resolution is improved by packing around the imaging space the optics for more beams.…”

“…In industrial applications, the requirements placed on the spatial resolution of a tomographic image depend on the size of the target combustion field and the size of the smallest feature to be detected. For instance, process control in large-size coal-fired/biomass boilers [18,19] and thermal power plants [20] requires centimeter-level spatial resolution in the tomographic image, while combustion diagnostics in automotive engines [9,21] and swirl combustors [17,22] for millimeter-level spatial resolution. Visualization of the mixing process has been previously demonstrated for both the liquid and vapor phases of fuel injected in the chamber of Spark Ignition (SI) and Compression Ignition (CI) engines [9,21], however the spatial resolution was insufficient to tomographically resolve the fuel spray pattern.…”

Laser absorption spectroscopy for combustion diagnosis in reactive flows: A review

“…Most recently, the newly developed highly spatially-resolved sensor was employed to monitor the dynamic cross-sectional behavior of swirling flames. Particularly, the developed sensor was applied to capture dynamically the process of blowout of the swirling flame, illustrating that the sensor can provide firsthand and reliable visual data to help prevent the flame from lean-blowout (177).…”

3D Evolutionary Reconstruction of Scalar Fields in the Gas-Phase

“…In the last decades 3D computed tomography (CT) methods have seen widespread use in numerous areas of engineering and physical sciences research. The methods have combined CT with various different measurement techniques such as laser absorption spectroscopy [1][2][3], schlieren [4,5], chemiluminescence [6][7][8][9][10][11][12][13][14][15][16][17] and particle image velocimetry [18,19]. Generally, projection measurements that are obtained at different angles around the probed volume are used for reconstructions.…”