Towards High-Repetition Rate Rayleigh and Raman Scattering Imaging in Turbulent Jets and Flames

In this paper we will describe recent advances made in our laboratory in the development of high-repetition-rate Rayleigh and Raman scattering imaging capabilities. High-repetition-rate 1D Raman and 2D Rayleigh scattering imaging capabilities are being developed to image the time-varying mixture fraction and temperature fields in turbulent non-reacting and reacting flows. Initial results using a custom pulse-burst laser system at Ohio State University have demonstrated the ability to capture ten sequential 2D Rayleigh scattering images at a repetition rate of 10 kHz in both turbulent non-reacting jets and non-premixed jet-flames with pulse energies approaching 200 mJ at 532 nm. This paper will also describe the development and pending application of a new higher-energy, long-duration, next-generation burst-mode laser system and the use of higher resolution cameras for high-speed Raman/Rayleigh imaging.