Title

Fluid Flow And Heat Transfer In Rotating Curved Duct At High Rotation And Density Rations

Abstract

Prediction of flow field and heat transfer of high rotation numbers and density ratio flow in a square internal cooling channels of turbine blades with U-turn as tested by Wagner et. al (1991) is the main focus of this study. Rotation, buoyancy and strong curvature affect the flow within these channels. Due to the fact that RSM turbulence model can respond to the effects of rotation, streamline curvature and anisotropy without the need for explicit modeling, it is employed for this study as it showed improved prediction compared to isotropic twoequation models. The near wall region was modeled using enhanced wall treatment approach. RSM was validated against available experimental data (which are primarily at low rotation and buoyancy numbers). The model was then used for cases with high rotation numbers (as much as 1.29) and high-density ratios (up to 0.4). Particular attention is given to how secondary flow, velocity and temperature profiles, turbulence intensity and Nusselt number area affected by coriolis and buoyancy/centrifugal forces caused by high levels of rotation and buoyancy in the immediate vicinity of the bend. The results showed that 4-side-average Nu, similar to low Ro cases, increases linearly by increasing rotation number and, unlike low Ro cases, decreases slightly by increasing density ratio.

Publication Date

12-22-2004

Publication Title

Proceedings of the ASME Turbo Expo 2004

Volume

3

Number of Pages

33-43

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

Socpus ID

10244224106 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/10244224106

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