Multi-parameter, kHz rate spectrally resolved NO PLIF in a supersonic jet

Quantitative, high-bandwidth measurements of temperature, pressure, and velocity are needed to characterize high-speed flows and validate numerical simulations. To that end, this work demonstrates rapid, multi-parameter spectrally resolved planar laser-induced fluorescence (SR-PLIF) for spatially resolved, calibration-free measurements of these three key quantities using the gamma-bands of nitric oxide near 225.33 nm. The SR-PLIF technique was validated from 295-420 K and 3.48-20.4 kPa using a static gas cell and exhibits an average temperature and pressure error of 2% and 4%, respectively. The diagnostic was then used to study an underexpanded jet at rates up to 1 kHz and a spatial resolution of 220µm, with results showing favorable agreement with numerical simulations.