Measurement of Dissociation Fraction and Temperature using Laser Rayleigh Scattering Methods
Additional Document Info
2016, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved. This paper presents two diagnostic techniques based on laser Rayleigh scattering, primarily aimed at interrogating free stream conditions in arc jet facilities. One technique, Rayleigh scattering polarimetry (RSP), can be used to measure nitrogen dissociation fraction, while the second, Thermal Acoustic Wave (TAW) Thermometry, determines temperature from the wave speed obtained from the imaging of propagating acoustic waves. The RSP diagnostic demonstrated accurate measurement of dissociation fraction in two-component surrogate mixtures of atoms and molecules at various temperatures. The results from the TAW thermometry for pure species and mixtures show that the general trend was captured by the technique; however, there is a significant over-estimate of the gas temperature outside the error bounds. The shock wave strength may play an important role in producing this result due to its propagation at greater than acoustic velocity.
name of conference
32nd AIAA Aerodynamic Measurement Technology and Ground Testing Conference