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

• Published in: Measurement : journal of the International Measurement Confederation Vol. 169; p. 108505
• Main Authors: Jin, Seong-Ho, Kim, Gyung-Soo
• Format: Journal Article
• Language: English
• Published: London Elsevier Ltd 01.02.2021; Elsevier Science Ltd
• Subjects: Burning velocity; Combustion chambers; Constant volume combustion chamber; Excimer lasers; Excimers; High gain; Initial pressure; Krypton fluoride lasers; Lasers; Light sources; Premixed combustion; Rayleigh number; Rayleigh scattering; Scattering; Scattering cross sections; Spatial distribution; Temperature; Temperature distribution; Ultraviolet lasers; Velocity; Rayleigh scattering; Premixed combustion; Constant volume combustion chamber; Burning velocity
• ISSN: 0263-2241; 1873-412X
• DOI: 10.1016/j.measurement.2020.108505

•Quantitative burning velocity and temperature distribution were measured simultaneously.•UV light enables measurements of thermodynamic properties in a single shot.•Uncertainty in temperature measurement depends on signal to noise ratio of detector. 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.