Time-resolved Rayleigh scattering tomography

Abstract

Tomographic Rayleigh scattering (RS) imaging at a repetition rate of 10 kHz was demonstrated in non-reacting flows employing the second harmonic of a high-energy Nd: YAG burst-mode laser. Sequences of 100 images of the flow mixture fraction were directly derived from high-speed four-dimensional (4D) RS images. The tomographic reconstruction algorithm, measurement resolution, uncertainties, and jet flow mixing characteristics are discussed. Successful tomographic RS imaging using a high-energy burst-mode laser source lays the foundation for spatiotemporal, multidimensional analyses of density, mixture fraction, and temperature measurements in reacting and non-reacting flows of practical interest.