Towards simultaneous velocimetry and thermometry measurements using the VENOM diagnostic technique
We have recently demonstrated the utility of the Vibrationally Enhanced NO Monitoring (VENOM) technique in our laboratory. The technique exploits the significant yield of NO (v=l) originating from the 355 nm photodissociation of NO2 and the corresponding stability of the NO (v=l) 'tag' is whose lifetime is governed by slow reactions, diffusion/mixing out of the probe sheet volume and relatively slow vibrational relaxation. The technique can be applied to environments with large ambient NO backgrounds (e.g. combustion or high enthalpy systems) or environments characterized by high temperatures where the vibrationally excited NO can be easily detected. Here we discuss efforts towards simultaneous planar velocimetry and thermometry (internal and/or external) by employing a dual line planar laser induced fluorescence 'read' system. In addition, we will present recent progress in increasing the velocity resolution of the technique. Copyright 2010 by the American Institute of Aeronautics and Astronautics, Inc.