Accession Number:

ADA257291

Title:

Hydrodynamic Effects on Heat Transfer for Film-Cooled Turbine Blades.

Descriptive Note:

Final rept. 1 Sep 1988-30 Apr 1992

Corporate Author:

TEXAS UNIV AT AUSTIN TURBULENCE AND TURBINE COOLING RESEARCH LAB

Personal Author(s):

Report Date:

1992-05-01

Pagination or Media Count:

115.0

Abstract:

The objectives of this project were to develop a technique for generating very high freestream turbulence levels and to determine resulting effects on turbulent boundary layer and film cooling flows. Also, included in this project was the development of a simultaneous temperaturevelocity measurement technique. All of these objectives were accomplished as described below however, film cooling flows were studied only for minimal freestream turbulence levels. Several turbulence generating devices were studied to determine the maximum turbulence levels. Tests indicated that high velocity jets in cross-flow generated turbulence levels, Tu, which ranged from Tu 20 to 11 over a 0.65 m distance. The turbulence integral length scales for this flow were on the order of boundary layer thickness. High freestream turbulence levels caused significant increases in surface heat flux. Various correlations for freestream turbulence affects on surface heat flux were evaluated. None of these correlations were adequate however, with slight modifications two of the correlations reasonably collapsed the data. Thermal field measurements of simulated film cooling flows with a minimal freestream turbulence level indicated that the jet detachmentreattachment scaled with the momentum flux ratio.

Descriptors:

Subject Categories:

  • Fluid Mechanics
  • Thermodynamics
  • Jet and Gas Turbine Engines

Distribution Statement:

APPROVED FOR PUBLIC RELEASE


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