Simultaneous measurements of burning velocity and temperature distribution of combustion using UV laser Rayleigh scattering

Planar temperature images using laser Rayleigh scattering have been obtained to determine the spatial distribution of temperature in a constant volume combustion chamber. Burning velocities were also measured from measured pressures and calculated flame surface area from Rayleigh scattering images. A high power KrF excimer laser was used as a light source and a high gain ICCD camera was used to obtain temperature images. Methane/air premixed combustion at different equivalence ratios and initial pressures were tested. Since the thermodynamics are well known, a constant volume chamber can be used as a reference device for diagnostics in high temperatures and pressures combustion. With the Rayleigh scattering technique, temperature and burning velocity can be measured simultaneously using a single-shot laser light. An additional laser Rayleigh experiment is described which yields scattering cross sections at the wavelength of 248 nm. The experimental results show an excellent agreement with previous data.

Automated summary

Planar temperature images were obtained using laser Rayleigh scattering to determine temperature distribution in a constant volume combustion chamber. Burning velocities were measured from pressures and flame surface area from Rayleigh scattering images. The technique allows simultaneous measurement of temperature and burning velocity using a single-shot laser light.