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Numerical Predictions of the Effect of Rotation on Fluid Flow and Heat Transfer in an Engine-similar Two-pass Internal Cooling Channel with Smooth and Ribbed Walls

Schüler, M. and Dreher, H.-M. and Neumann, S. O. and Weigand, B. and Elfert, M. (2010) Numerical Predictions of the Effect of Rotation on Fluid Flow and Heat Transfer in an Engine-similar Two-pass Internal Cooling Channel with Smooth and Ribbed Walls. In: Proceedings of ASME Turbo Expo 2010 (ASME G), pp. 1-13. ASME Turbo Expo 2010, June 14-18, 2010, Glasgow, UK.

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Abstract

In the present study, a two-pass internal cooling channel with engine-similar cross-sections was investigated numerically. The channel featured a trapezoidal inlet pass, a sharp 180° bend and a nearly rectangular outlet pass. Calculations were conducted for a configuration with smooth walls and walls equipped with 45° skewed ribs (P/e = 10, e/dh = 0.1) at a Reynolds number of Re = 50,000. The present study focused on the effect of rotation on fluid flow and heat transfer. The investigated rotation numbers were Ro = 0.0 and 0.10. The computations were performed by solving the Reynolds-averaged Navier-Stokes equations (RANS method) with the commercial Finite-Volume solver FLUENT using a low-Re k-ω-SST turbulence model. The numerical grids were block-structured hexahedral meshes generated with POINTWISE. Flow field measurements were independently performed at DLR using Particle Image Velocimetry. In the smooth channel rotation had a large impact on secondary flows. Especially, rotation induced vortices completely changed the flow field. Rotation also changed flow impingement on tip and outlet pass side wall. Heat transfer in the outlet pass was strongly altered by rotation. In contrast to the smooth channel, rotation showed less influence on heat transfer in the ribbed channel. This is due to a strong secondary flow field induced by the ribs. However, in the outlet pass Coriolis force markedly affected the rib induced secondary flow field. The influence of rotation on heat transfer was visible in particular in the bend region and in the second pass directly downstream of the bend.

Document Type:Conference or Workshop Item (Paper)
Title:Numerical Predictions of the Effect of Rotation on Fluid Flow and Heat Transfer in an Engine-similar Two-pass Internal Cooling Channel with Smooth and Ribbed Walls
Authors:
AuthorsInstitution or Email of Authors
Schüler, M.ITLR, Univ. Stuttgart
Dreher, H.-M.ITLR, DLR
Neumann, S. O.ITLR, Univ. Stuttgart
Weigand, B.ITLR, Univ. Stuttgart
Elfert, M.DLR, Martin.Elfert@dlr.de
Date:June 2010
Journal or Publication Title:Proceedings of ASME Turbo Expo 2010
Refereed publication:Yes
In ISI Web of Science:Yes
Page Range:pp. 1-13
Status:Published
Keywords:CFD, Numerical Flow Simulation, Internal Cooling, Turbine Blade Cooling, Rotational Effect, Ribbed Walls, Heat Transfer
Event Title:ASME Turbo Expo 2010
Event Location:Glasgow, UK
Event Type:international Conference
Event Dates:June 14-18, 2010
Organizer:ASME
HGF - Research field:Energy
HGF - Program:Efficient Energy Conversion (old)
HGF - Program Themes:E VG - Combustion and Gas Turbine Technologies (old)
DLR - Research area:Energy
DLR - Program:E VG - Combustion and Gas Turbine Technologies
DLR - Research theme (Project):E - Gasturbine (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Propulsion Technology > Fan and Compressor
Deposited By: Rosemarie Fox
Deposited On:17 Sep 2010 11:52
Last Modified:12 Dec 2013 21:01

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