Accession Number : ADA269299

Title :   Two-Dimensional Navier-Stokes Heat Transfer Analysis for Rough Turbine Blades.

Descriptive Note : Technical memo.,

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

Personal Author(s) : Boyle, R. J. ; Civinskas, K. C.

Report Date : JUN 1991

Pagination or Media Count : 13

Abstract : A quasi-three-dimensional thin-layer Navier-Stokes analysis was used to predict heat transfer to rough surfaces. Comparisons are made between predicted and experimental heat transfer for turbine blades and flat plates of known roughness. The effect of surface Toughness on heat transfer was modeled using a mixing length approach. The effect of near-wall grid spacing and convergence criteria on the accuracy of the heat transfer predictions are examined. An eddy viscosity mixing length model having an inner and outer layer was used. A discussion of the appropriate model for the crossover between the inner and outer layers is included. The analytic results are compared with experimental data for both flat plates and turbine blade geometries. Comparisons between predicted and experimental heat transfer showed that a modeling roughness effects using a modified mixing length approach results in good predictions of the trends in heat transfer due to roughness. Turbine, Heat transfer, Rough surface

Descriptors :   *HEAT TRANSFER, *TURBINE BLADES, *SURFACE ROUGHNESS, ACCURACY, BLADES, COMPARISON, CONVERGENCE, EXPERIMENTAL DATA, LAYERS, MODELS, PLATES, PREDICTIONS, ROUGHNESS, THREE DIMENSIONAL, TOUGHNESS, VISCOSITY, NAVIER STOKES EQUATIONS.

Subject Categories : Thermodynamics
      Hydraulic and Pneumatic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE