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This paper deals with the experimental and computational analysis of ow and heat transfer in a turning duct simulating the overall three-dimensional ow and heat transfer characteristics of gas turbine passages and internal cooling channels. The numerical results obtained for three dierent Reynolds numbers (790, 40,000, and 342,190) are compared to measured ow characteristics. Extensive measurements of the mean ow structure using a sub-miniature ®ve-hole-probe and a hot-wire provide a quantitative assessment of the computational model used in the analysis. An in-house developed three-dimensional viscous ow solver is the main computational tool of the present study. A well known pressure correction method (SIMPLE) is used for the solution of 3-D incompressible, steady Navier ± Stokes equations in a generalized coordinate system. The k ± e turbulence model of Launder and Spalding including a curvature correction scheme is utilized to describe the turbulent ow ®eld. A nonstaggered grid system is used in an upwind scheme with additional numerical dissipation terms. It is clearly shown that reducing the arti®cial dissipation terms in a central dierencing scheme reduced the numerical dissipation error. Part II of this paper deals with the convective heat transfer aspects of the speci®c ow near the endwall surface where three-dimensional viscous ow structures are dominant. The measured uid mechanics data presented in this paper also provide a reliable data set that can be used in the future validation of new computational methods.

international journal of rotating machinery

Turbulent Flow and Endwall Heat Transfer Analysis in a<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="$90^{\circ}$" id="E1"><mml:mrow><mml:msup><mml:mrow><mml:mn>90</mml:mn></mml:mrow><mml:mo>∘</mml:mo></mml:msup></mml:mrow></mml:math>Turning Duct and Comparisons with Measured Data: Part I: Influence of Reynolds Number and Streamline Curvature on Viscous Flow Development

Turbulent Flow and Endwall Heat Transfer Analysis in a90∘Turning Duct and Comparisons with Measured Data: Part I: Influence of Reynolds Number and Streamline Curvature on Viscous Flow Development