21st Congress of International Council of the Aeronautical Sciences, Melbourne, Australia, 13-18 September, 1998
Paper ICAS-98-3.1.4

INSTANTANEOUS PLIF MEASUREMENT OF SPECIES MOLE-FRACTION IN A VARYING TEMPERATURE SUPERSONIC FLOW

Fox J. S., Danehy P. M., Houwing A. F. P.
Australian National University, Australia

Keywords: plif measurement, species mole-fraction, varying temperature, supersonic flow

A theoretical model for instantaneous PLIF measurements of mole fraction in a shock tunnel flow with pressure gradients and large temperature variations is presented. The model determined the optimum excitation frequency which provided PLIF signal intensity proportional to freestream mole fraction. Experimental PLIF images of a two dimensional slot scramjet injector with and without hydrogen fuel injection were obtained. Using the theoretical modelling, the injection image was corrected so that intensity directly corresponded to the freest ream mixture fraction.

view full paper