Toluene PLIF temperature and pressure imaging in supersonic flows

Planar laser-induced fluorescence (PLIF) of toluene is used to image temperature, T, and pressure, P, in supersonic flows. Toluene fluorescence is broadband and exhibits a red-shift at elevated temperatures, enabling two-camera, dual-band imaging of temperature. With the temperature field known, the original LIF signal from a single camera is converted to pressure. This technique is demonstrated by imaging Mach 2.3 flow of nitrogen seeded with 0.5\% toluene (by volume) over a wedge and a cylinder; PLIF-imaged T and P fields are compared to computed solutions of these flowfields, and preliminary comparisons show promise.