Accession Number : ADA294474

Title :   The Effect of Rotational Motion on Jet-Impingement Cooling. The Tornado Effect on Hairpin Vortices in Turbulent Convective Cooling.

Descriptive Note : Final rept. 1 Mar 91-30 Sep 94,

Corporate Author : WASHINGTON UNIV SEATTLE

Personal Author(s) : Kurosaka, M. ; Aronstein, David C. ; Dartford, David W. ; Fox, Micheal D. ; Hagen, Jeffrey P.

PDF Url : ADA294474

Report Date : 31 DEC 1994

Pagination or Media Count : 47

Abstract : The overall objective of the program is to enhance the effectiveness of turbine cooling by exploiting the presence and structures of vortices. Program A is concerned with jet impingement cooling and addresses the effects of bulk fluid rotation on jets, their vortical structures and cooling. A low-speed rotating water tunnel has been constructed for flow-visualization study of impinging jets in rotation: in addition, a rotating air rig was also constructed. The results show that the Contour of the impinging jet is crucial in determining the jet trajectory and both the favorable and adverse effects of rotation have been identified in the context of impingement cooling. Program B is concerned with convective and film-cooling. It focuses upon the so-called tornado effect, or the corewise transport of heat through the legs of hairpin vortices, which could lead to enhanced cooling in turbulent flows. An explicit confirmation of the effect have been established by ain water and unsteady heat transfer measurements in air. (AN)

Descriptors :   *TURBULENT FLOW, *VORTICES, *FILM COOLING, *JET FLOW, PRESSURE GRADIENTS, AIR FLOW, TURBULENT BOUNDARY LAYER, FLOW VISUALIZATION, GAS TURBINES, FLOW FIELDS, TEMPERATURE GRADIENTS, THERMAL ANALYSIS, ADVERSE CONDITIONS, UNSTEADY FLOW, CONVECTION(HEAT TRANSFER), FREE STREAM, ROTATION, SURFACE TEMPERATURE, AXIAL FLOW, CROSS FLOW, IMPINGEMENT.

Subject Categories : Fluid Mechanics
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE