TY - GEN
T1 - Near-surface CO2 tunable diode laser absorption spectroscopy concentration measurement in the LENS-XX expansion tunnel facility
AU - Weisberger, Joshua
AU - DesJardin, Paul
AU - MacLean, Matthew
AU - Parker, Ronald
AU - Carr, Zakery
N1 - Publisher Copyright:
© 2016, American Institute of Aeronautics and Astronautics Inc, AIAA. All Rights Reserved.
PY - 2016
Y1 - 2016
N2 - Measurements of carbon dioxide concentration are made in the LENS-XX expansion tunnel at CUBRC to investigate the effects of surface catalysis in hypersonic flows. A tunable diode laser absorption spectroscopy setup probes the P36e CO2 absorption line of the ν1+ν3 combination band at 2.7153 μm. Numerical simulations are computed with DPLR using the specified reaction efficiency surface catalysis model. Absorption measurements adjacent to the surface of an aluminum cylinder correlate well with simulations indicating low catalytic efficiency at the surface. The velocity, density, freestream temperature, specific enthalpy, and stagnation point pitot pressure of the run are 4.6 km/s, 1.53 g/m3, 1328.4 K, 11.75 MJ/kg, and 31.6 kPa, respectively. Simulation of the absorption spectrum is performed using a non-homogeneous line-by-line code utilizing the HITRAN database for spectroscopic parameters. Input data for the code is obtained from computational fluid dynamics simulations of the cylinder and facility. Specified reaction efficiency for the mechanism CO+O→CO2 is determined inversely using detailed CFD and comparisons to experimental measurements. Best agreement was found for γCO = 0.00025 to 0.0005, indicating that the coupled line-by-line code and CFD approach is useful for assessing near-surface composition using tunable diode laser absorption measurements of hypersonic flows.
AB - Measurements of carbon dioxide concentration are made in the LENS-XX expansion tunnel at CUBRC to investigate the effects of surface catalysis in hypersonic flows. A tunable diode laser absorption spectroscopy setup probes the P36e CO2 absorption line of the ν1+ν3 combination band at 2.7153 μm. Numerical simulations are computed with DPLR using the specified reaction efficiency surface catalysis model. Absorption measurements adjacent to the surface of an aluminum cylinder correlate well with simulations indicating low catalytic efficiency at the surface. The velocity, density, freestream temperature, specific enthalpy, and stagnation point pitot pressure of the run are 4.6 km/s, 1.53 g/m3, 1328.4 K, 11.75 MJ/kg, and 31.6 kPa, respectively. Simulation of the absorption spectrum is performed using a non-homogeneous line-by-line code utilizing the HITRAN database for spectroscopic parameters. Input data for the code is obtained from computational fluid dynamics simulations of the cylinder and facility. Specified reaction efficiency for the mechanism CO+O→CO2 is determined inversely using detailed CFD and comparisons to experimental measurements. Best agreement was found for γCO = 0.00025 to 0.0005, indicating that the coupled line-by-line code and CFD approach is useful for assessing near-surface composition using tunable diode laser absorption measurements of hypersonic flows.
UR - https://www.scopus.com/pages/publications/85007439891
M3 - Conference contribution
AN - SCOPUS:85007439891
SN - 9781624103933
T3 - 54th AIAA Aerospace Sciences Meeting
BT - 54th AIAA Aerospace Sciences Meeting
PB - American Institute of Aeronautics and Astronautics Inc, AIAA
T2 - 54th AIAA Aerospace Sciences Meeting, 2016
Y2 - 4 January 2016 through 8 January 2016
ER -