Abstract
Based on tunable diode laser absorption spectroscopy (TDLAS), two-dimensional (2D) distribution reconstructions of gas concentration and temperature are realized using an algebraic reconstruction technique (ART). The influence of the beam distribution and grid size on combustion field reconstruction is investigated to attain optimal reconstruction results with a limited number of beams. Under limited optical-path numbers, it shows that a better spatial resolution is attainable only when the laser beam paths are vertical and parallel to the symmetry axis of the combustion field. Furthermore, experiments with 16 beam paths using one and two flat flame combustion fields are carried out in different fuel-air equivalence ratios under room temperature. The results are in agreement with the simulation results, and the time resolution is less than 1 s.
Highlights
In combustion-related systems, measurements of temperature and species concentrations are necessary to fundamentally understand the combustion, optimize the operation process, and improve the combustion efficiency
Many diagnostic techniques used for measurement of combustion characterization, such as laser light scattering [1,2], molecular filtered Rayleigh scattering (FRS) [3], coherent anti-stokes Raman scattering (CARS) [4], planar laser induced fluorescence (PLIF/LIF) [5,6,7], have been reported
The measurements demonstrate the ability of tunable diode laser absorption tomography (TDLAT) sensing to monitor temperature and gas concentration distributions in harsh practical environments
Summary
Anhui Provincial Key Laboratory of Photonic Devices and Materials, Anhui Institute of Optics and Fine Key Lab of Environmental Optics & Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China School of Environmental Science & Optoelectronic Technology, University of Science and Technology of Received: 30 July 2017; Accepted: 20 September 2017; Published: 25 September 2017
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