Abstract

We present a demonstration of the simultaneous measurement of spatially resolved three-component velocity and temperature in gaseous flow fields using a variant of the vibrationally excited nitric oxide monitoring (VENOM) technique, based on planar laser induced fluorescence and molecular tagging velocimetry methods. Three-component velocity determinations were derived from two-dimensional molecular tagging velocity measurements employing sequential fluorescence image pairs obtained simultaneously by two cameras in stereoscopic configuration. Probing two different rotational states of nitric oxide ($X^2\prod$, ${\upsilon }^{\prime \prime }=1$), produced via fluorescence and collisional quenching from initial excitation to the A ${}^2{\mathbf{\Sigma }}^{+}$ state, for the sequential velocimetry images allows simultaneous determination of the temperature field. Experimental measurements of velocity and temperature across an oblique shock result in mean values within 21 m/s for the three components of velocity and 20 K for planar temperature when compared to oblique shock calculations.

© 2016 Optical Society of America

Vibrationally excited NO tagging by NO(A²Σ⁺) fluorescence and quenching for simultaneous velocimetry and thermometry in gaseous flows

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