Dynamic Measurement of Temperature, Velocity, and Density in Hot Jets Using Rayleigh Scattering

摘要: A molecular Rayleigh scattering technique is utilized to measure gas temperature, velocity, and density in unseeded flows at sampling rates up 10 kHz, providing fluctuation information 5 kHz based on the Nyquist theorem. high-power continuous-wave laser beam focused a point an air flow field scattered light collected fiber-optically transmitted Fabry–Perot interferometer for spectral analysis. Photomultiplier tubes operated photon counting mode allow high-frequency of total signal level circular interference pattern provide dynamic density, velocity measurements. Mean root mean square as well power calculations, are presented measurements hydrogen-combustor heated jet facility with 50.8-mm diameter nozzle NASA John H. Glenn Research Center Lewis Field. The compared particle image velocimetry data computational fluid dynamics predictions. This aimed aeronautics research related identifying noise sources free jets, applications supersonic hypersonic where measurement properties, including mass flux, required presence shocks ionization occurrence.