Computer-controlled multiparameter flowfield measurements using planar laser-induced iodine fluorescence

Abstract

A measurement technique for the mapping of complex compressible flowfields using planar laser-induced iodine fluorescence (PLIIF) is presented. Time-averaged values of all relevant flowfield properties are found : pressure, temperature, velocity, and, for mixing flowfields, injectant mole fraction. Several modifications have been made to a previous version of the PLIIF technique that allow multiple planes of data, needed for studying highly three-dimensional flowfields, to be collected and processed in greatly reduced time and with improved measurement accuracies. The technique is demonstrated with measurements in the flowfield of a Mach 2, rearward-facing step. The technique presented represents a unique tool that allows complex, compressible, three-dimensional flowfields to be mapped out completely and nonintrusively.