Accession Number : ADA336063

Title :   Measurements of Heat Transfer, Flow, and Pressures in a Simulated Turbine Blade Internal Cooling Passage

Descriptive Note : Technical paper

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH LEWIS RESEARCH CENTER

Personal Author(s) : Russell, Louis M. ; Thurman, Douglas R. ; Poinsatte, Philip E. ; Hippensteele, Steven A.

PDF Url : ADA336063

Report Date : DEC 1997

Pagination or Media Count : 25

Abstract : An experimental study was made to obtain quantitative information on heat transfer, flow, and pressure distribution in a branched duct test section that had several significant features of an internal cooling passage of a turbine blade. The objective of this study was to generate a set of experimental data that could be used for validation of computer codes that would be used to model internal cooling. Surface heat transfer coefficients and entrance flow conditions were measured at nominal entrance Reynolds numbers of 45 000, 335 000, and 726 000. Heat transfer data were obtained by using a steady-state technique in which an Inconel heater sheet is attached to the surface and coated with liquid crystals. Visual and quantitative flow-field data from particle image velocimetry measurements for a plane at midchannel height for a Reynolds number of 45 000 were also obtained. The flow was seeded with polystyrene particles and illuminated by a laser light sheet. Pressure distribution measurements were made both on the surface with discrete holes and in the flow field with a total pressure probe. The flow-field measurements yielded flow-field velocities at selected locations. A relatively new method, pressure sensitive paint, was also used to measure surface pressure distribution. The pressure paint data obtained at Reynolds numbers of 335 000 and 726 000 compared well with the more standard method of measuring pressures by using discrete holes.

Descriptors :   *HEAT TRANSFER, *FLOW VISUALIZATION, *PRESSURE MEASUREMENT, *TURBINE BLADES, VELOCITY, COMPUTER PROGRAMS, SIMULATION, STEADY STATE, PROBES, EXPERIMENTAL DATA, VALIDATION, MODELS, POLYSTYRENE, TURBULENCE, TEST EQUIPMENT, OPTICAL DATA, SENSITIVITY, LASER BEAMS, COOLING, LIQUID CRYSTALS, FLOW FIELDS, PARTICLES, SURFACE PROPERTIES, IMAGES, DUCTS, STANDARDIZATION, PAINTS, VELOCIMETERS, PRESSURE DISTRIBUTION, REYNOLDS NUMBER, HEAT TRANSFER COEFFICIENTS, HEATERS, NICKEL ALLOY INCONEL.

Subject Categories : Hydraulic and Pneumatic Equipment
      Fluid Mechanics
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE