Accession Number : ADA312505

Title :   PIV Technology for Simulated Turbine Film-Cooling Flows.

Descriptive Note : Final rept. 1 Nov 95-9 Jul 96,

Corporate Author : WRIGHT LAB WRIGHT-PATTERSON AFB OH

Personal Author(s) : Rivir, Richard ; Gogineni, Sivaram P. ; Goss, Larry P. ; Pestian, David J.

PDF Url : ADA312505

Report Date : 10 SEP 1996

Pagination or Media Count : 11

Abstract : Two-color double-pulsed PIV(Particle Image Velocimetry) was used to investigate turbine film-cooling flows with high freestream turbulence and simulated wake passing. Since the instantaneous realizations of these highly turbulent and unsteady flows are not representative of mean flow behavior, 10 - 30 realizations were typically recorded. The average from these realizations of the film-cooling flows for 1% freestream turbulence was compared with the corresponding hot-wire profile. The PIV images revealed shear-layer structure developing from the film-cooling-hole walls that has not been previously considered in modeling these flows. Improved modeling of the fluid dynamics of interaction and development of these flows (jet-spread and turning) also resulted from this PIV technique. Two-color double-pulsed PW (Particle Image Velocimetry) was used to investigate turbine film-cooling flows with high freestream turbulence and simulated wake passing. Since the instantaneous realizations of these highly turbulent and unsteady flows are not representative of mean flow behavior, 10 - 30 realizations were typically recorded. The average from these realizations of the film-cooling flows for 1% freestream turbulence was compared with the corresponding hot-wire profile. The PW images revealed shear-layer structure developing from the film-cooling-hole walls that has not been previously considered in modeling these flows. Improved modeling of the fluid dynamics of interaction and development of these flows (jet-spread and turning) also resulted from this PIV technique.

Descriptors :   *TURBULENT FLOW, *GAS TURBINES, *FILM COOLING, COMPUTERIZED SIMULATION, IMAGE PROCESSING, OPTIMIZATION, AIRCRAFT ENGINES, TURBULENCE, COMPUTATIONAL FLUID DYNAMICS, HIGH RESOLUTION, PRESSURE MEASUREMENT, FLOW FIELDS, WAKE, UNSTEADY FLOW, VELOCIMETERS, FREE STREAM, PRESSURE DISTRIBUTION, REYNOLDS NUMBER, SHEAR FLOW, CHARGE COUPLED DEVICES, JET MIXING FLOW, COLOR FILM.

Subject Categories : Fluid Mechanics
      Jet and Gas Turbine Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE