NON-INTRUSIVE FLOW TURBULENCE MEASUREMENT SYSTEM

PHYSICAL SCIENCES INC. (PSI) PROPOSES TO DEVELOP AN INNOVATIVE NON-INTRUSIVE FLOW DIAGNOSTIC TO MEASURE TURBULENCE IN HIGH TEMPERATURE ARC JET FLOWS. LASER-INDUCED FLUORESCENCE OF CU ATOM IMPURITIES PRESENT IN THE FLOW WILL BE DETECTED USING DIGITAL IMAGING TECHNIQUES TO MAP THE FLOWFIELD. THE OVERLAP BETWEEN A FIXED FREQUENCY LASER AND THE DOPPLER-SHIFTED ABSORBTION LINESHAPE WILL VARY WITH FLOW VELOCITY. THE FLUORESCENCE INTENSITY MAY BE RELATED TO THE VELOCITY AND FLUCTUATIONS IN THE FLUORESCENCE MAY BE RELATED TO THE TURBULENCE INTENSITY. AN INNOVATIVE CROSSED BEAM APPROACH IS PROPOSED TO DISTINGUISH TEMPERATURE AND DENSITY FLUCTUATIONS FROM VELOCITY FLUCTUATIONS. AN EXPERIMENTAL PROOF OF CONCEPT TASK IS COUPLED TO AN ANALYTICAL MODELING TASK IN THE PHASE I PROGRAM TO DETERMINE THE FEASIBILITY OF THE CONCEPT.