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Burst-Mode Planar Laser-Induced Fluorescence of Nitric Oxide in the Sandia Free-Piston Shock Tunnel

Kearney, S.P.; Lynch, Kyle P.; Daniel, Kyle; Jans, E.R.; Downing, Charley R.; Wagner, Justin W.

We report 100-kHz burst-mode planar laser-induced fluorescence imaging of the nitricoxide molecule in the free-piston facility at Sandia National Laboratories. Cylinder wakestartup transients are visualized in high-temperature (T ~ 3000 K) post-shock flow with the facility in the shock-tube mode of operation. In the reflected shock-tunnel mode, NO PLIF visualization of a 4.6-MJ/kg, 3 km/s startup flow over a cylinder is presented, and free-stream molecular-tagging velocimetry exploiting the long fluorescence lifetime of free-stream NO is demonstrated.