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Numerical Predictions of Fluid Flow and Heat Transfer in a Rotating Engine-Similar Two-Pass Internal Cooling Channel With Smooth and Ribbed Walls

Schüler, M. and Dreher, H.-M. and Elfert, M. and Neumann, S. O. and Weigand, B. (2010) Numerical Predictions of Fluid Flow and Heat Transfer in a Rotating Engine-Similar Two-Pass Internal Cooling Channel With Smooth and Ribbed Walls. In: Proceedings of the 13th Int. Symp. on Transport Phenomena and Dynamics of Rotating Machinery (ISROMAC13-2010-20104), pp. 1-12. ISROMAC13, 13th Int. Symp. on Transport Phenomena and Dynamics of Rotating Machinery, April 4 - 9, 2010, Honolulu, Hawaii, USA.

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Abstract

Numerical investigations of a two-pass internal cooling channel with engine-similar cross-sections were conducted. The channel featured a trapezoidal inlet pass, a sharp 180° bend, and a nearly rectangular second pass. Calculations were conducted for a smooth and a ribbed channel (α = 45°, P/e = 10, e/dh=0.1) at Re = 50,000 and four different rotation numbers Ro = 0, 0.02, 0.05 and 0.1. The Reynolds-averaged Navier-Stokes (RANS) equations were solved by the DLR Research Code TRACE developed at Institute of Propulsion Technology of German Aerospace Centre Cologne. A Wilcox k-ω turbulence model with additional modifications for rotating flows and stagnation point behaviour was applied. Computations were performed using block-structured grids created 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 wall and outlet pass side wall. Heat transfer in the outlet pass was strongly altered by the influence of rotation. In contrast to the smooth channel, rotation showed less influence on heat transfer in the ribbed channel. This was due to a strong secondary flow field induced by 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 Fluid Flow and Heat Transfer in a Rotating 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
Elfert, M.DLR, Martin.Elfert@dlr.de
Neumann, S. O.ITLR, Univ. Stuttgart
Weigand, B.ITLR, Univ. Stuttgart
Date:February 2010
Journal or Publication Title:Proceedings of the 13th Int. Symp. on Transport Phenomena and Dynamics of Rotating Machinery
Refereed publication:Yes
In ISI Web of Science:Yes
Page Range:pp. 1-12
Status:Published
Keywords:CFD, Numerical Flowe Simulation, TRACE, Internal Cooling, Turbine Blade Cooling, Rotational Effect, Coriolis Effect, Heat Transfer
Event Title:ISROMAC13, 13th Int. Symp. on Transport Phenomena and Dynamics of Rotating Machinery
Event Location:Honolulu, Hawaii, USA
Event Type:international Conference
Event Dates:April 4 - 9, 2010
Organizer:ISROMAC
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 12:16
Last Modified:17 Sep 2010 12:16

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