High temperature O₂ vibrational CARS thermometry applied to a turbulent oxy‐fuel combustion process

Abstract

An O2 vibrational coherent anti‐Stokes Raman scattering system for the temperature analysis of industrially relevant staged oxy‐fuel jet burners with a thermal load of 400 kW is presented. The equivalence ratio for both investigated burners was set to ϕ = 0.9 using a mixture of pure oxygen and natural gas H (high calorific value). Temperature profiles were achieved in the mixing region of the turbulent diffusion type burners at a selected downstream position. Temperature distributions and scatter plots show local temperature variations between 447 and 3085 K and demonstrate the turbulent behavior of the combustion process. Copyright © 2016 John Wiley & Sons, Ltd.

Collinear FAST CARS for Chemical Mapping of Gases

“…The great flexibility of the CARS technique makes it a popular instrument for performing thermometry measurements for various gases: nitrogen and oxygen [11][12][13], carbon dioxide [14], as well as methane and hydrogen [15]. CARS techniques allow concentration and temperature measurements in harsh environments and at high temperature during the combustion process [16,17]. Moreover, one-dimensional [18,19], as well as two-dimensional [20] single-shot thermometry and mapping of reactants and products in gas flows can be performed by different experimental approaches.…”

Comparison of Raman‐active crystals as a narrowband probe light source for picosecond three‐color vibrational CARS thermometry

“…In order to keep the CARS setup as simple as possible, the phase‐matching condition was realized in an unstable‐resonator spatially enhanced detection (USED)‐CARS configuration . This relatively simple configuration makes the three‐color setup well suitable for industrially relevant applications where a simplicity and reliability of the experiment are very helpful . USED‐CARS provides a good signal stability even in turbulent flames with highly fluctuating refractive index fields .…”

Advanced Laser-Based Techniques for Gas-Phase Diagnostics in Combustion and Aerospace Engineering

“…For example, they studied cryogenic liquid oxygen (LOX) and gaseous oxygen-fed hydrogen [146][147][148] and hydrocarbon 147,149,150 flames operated under rather extreme conditions, i.e., pressures as high as 20 MPa and temperatures as high as 3000 K. Similar temperatures were measured in the jet flame of a staged oxy-fuel burner of a large-scale industrial furnace fueled with natural gas. 151 Kampmann et al 152 used vibrational CARS in a highly turbulent swirl flame. The results were utilized to calibrate the data from planar laser Rayleigh scattering in order to obtain a 2D temperature distribution.…”