Single‐shot CARS thermometry of high‐pressure hydrocarbon flames using simultaneous intensity and linewidth measurements

Abstract

We demonstrate the feasibility of single laser shot coherent anti-Stokes Raman scattering thermometry with simultaneous measurement of intensities of hydrogen Q-branch lines and their linewidths in a pulsed CH 4 /O 2 combustion chamber operating at 20 MPa pressure and 3000 K temperature -parameters that are typical for full-scale rocket engines. The measurements were done by means of a spectrograph combined with an interferometer having orthogonal directions of dispersions. This approach allows correct temperature evaluation that takes into account the directly measured linewidths.

Recent advances in linear and nonlinear Raman spectroscopy. Part V

“…The feasibility was demonstrated by Vereschagin et al . of single laser shot CARS thermometry with simultaneous measurement of intensities of hydrogen Q‐branch lines and their linewidths in a pulsed CH 4 /O 2 combustion chamber operating at 20 MPa pressure and 3000 K temperature – parameters that are typical for full‐scale rocket engines . In a related paper, a high‐resolution (~0.1 cm −1 ) spectroscopic method based on the application of a Fabry–Perot interferometer to the spectral analysis of the CARS signal from an individual Raman transition was reported by Vereschagin et al .…”

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

“…[143][144][145] Clauss and collaborators applied hydrogen CARS thermometry to combustion systems of relevance to rocket engines. 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.…”

Advances in nonlinear optical spectroscopies: a historical perspective of developments and applications presented at ECONOS

“…Clauss et al and collaborators applied hydrogen CARS thermometry to combustion systems of relevance to rocket engines. They studied cryogenic liquid oxygen and gaseous oxygen‐fed hydrogen and hydrocarbon flames operated under extreme conditions. They achieved measurements at pressures as high as 20 MPa and temperatures as high as 3000 K.…”