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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. (2012) 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. Journal of Turbomachinery, VOL. 134 (NO. 2), 021021-1-021021-10. American Society of Mechanical Engineers (ASME). DOI: 10.1115/1.4003086 ISSN 0889-504X

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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 deg bend, and a nearly rectangular outlet pass. Calculations were done for a configuration with smooth walls and walls equipped with 45 deg 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 (Reynolds-averaged Navier–Stokes method) with the commercial finite-volume solver FLUENT using a low-Re shear stress transport (SST) k- turbulence model. The numerical grids were block-structured hexahedral meshes generated with POINTWISE. Flow field measurements were independently performed at German Aerospace Centre Cologne 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 the tip and the outlet pass sidewall. 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 forces 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.

Item URL in elib:https://elib.dlr.de/76746/
Document Type:Article
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 AuthorsAuthors ORCID iD
Schüler, M.UNSPECIFIEDUNSPECIFIED
Dreher, H.-M.UNSPECIFIEDUNSPECIFIED
Neumann, S.O.UNSPECIFIEDUNSPECIFIED
Weigand, B.UNSPECIFIEDUNSPECIFIED
Elfert, M.martin.elfert (at) dlr.deUNSPECIFIED
Date:March 2012
Journal or Publication Title:Journal of Turbomachinery
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:VOL. 134
DOI :10.1115/1.4003086
Page Range:021021-1-021021-10
Editors:
EditorsEmail
Wisler , David C.ASME
Publisher:American Society of Mechanical Engineers (ASME)
Series Name:Journal of Turbomachinery
ISSN:0889-504X
Status:Published
Keywords:turbine blade cooling, two-pass system, ribbed wall, bend, u-turn, flow turning, serpentine passage, flow simulation, CFD, heat transfer measurement, heat transfer prediction, LC Liquid Crystal, transient temperature measurement technique
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: Göttingen
Institutes and Institutions:Institute of Propulsion Technology > Turbine
Deposited By: Fox, Rosemarie
Deposited On:09 Aug 2012 11:02
Last Modified:08 Mar 2018 18:46

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