Accession Number : ADA299845

Title :   Measurement and Control of Heat Transfer in Steady and Unsteady Turbulent Separated Flow.

Descriptive Note : Final technical rept. 16 Jun 91-15 Jun 95,

Corporate Author : VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG DEPT OF AEROSPACE AND OCE AN ENGINEERING

Personal Author(s) : Lewis, Douglas J. ; Simpson, Roger L.

PDF Url : ADA299845

Report Date : 15 JUN 1995

Pagination or Media Count : 27

Abstract : The turbulence structure of convective heat transfer was studied experimentally in complex three- dimensional and separated turbulent boundary layers. Three test cases whose fluid dynamics have been well documented were examined. In case 1, time resolved surface heat transfer was measured in the nose region of a wing-body junction formed by a wing and a flat plate. Mean, statistical and spectral characteristics of the surface heat transfer are reported. The effects of wing shape were investigated by measuring the surface heat transfer in the nose region of a modified NACA 0020, a streamlined cylinder shape and NACA 0015. The effectiveness of a flow control device to reduce surface heat transfer is reported. In case 2, simultaneous surface heat flux and temperature profiles were measured at 11 locations in the spatially-developing pressure-driven three-dimensional turbulent boundary layer upstream of the wing-body junction. In case 3, simultaneous surface heat flux and temperature profiles were measured at 18 stream-wise locations in a mean 2-dimensional adverse-pressure gradient separating turbulent boundary layer. Mean, statistical and spectral heat flux and temperature data are reported. Mean ejection frequencies, turbulence length scales, inclination angles of the turbulence structure. and coherency between the inner and outer regions of the flow were examined from these results. Several useful correlations between surface heat transfer and velocity are reported.

Descriptors :   *TURBULENT FLOW, *UNSTEADY FLOW, *CONVECTION(HEAT TRANSFER), *FLOW SEPARATION, *STEADY FLOW, ANGLES, TEMPERATURE, CONTROL SYSTEMS, SHAPE, STATISTICS, TURBULENCE, TURBULENT BOUNDARY LAYER, REGIONS, SURFACES, SPECTRA, PROFILES, PLATES, SCALE, LENGTH, SLOPE, EJECTION, SYNCHRONISM, JUNCTIONS, FLUID DYNAMICS, WINGS, HEAT FLUX, SURFACE TEMPERATURE, WING BODY CONFIGURATIONS, OUTER SPACE.

Subject Categories : Fluid Mechanics
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE