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TECHNICAL PAPERS

Experimental Investigation of the Aerothermal Performance of a High Blockage Rib-Roughened Cooling Channel

[+] Author and Article Information
Luca Casarsa

Dipartimento di Energetica e Macchine, University of Udine, via delle Scienze 208, 33100 Udine, Italyluca.casarsa@uniud.it

Tony Arts

Turbomachinery and Propulsion Department, von Kármán Institute for Fluid Dynamics, 72, chaussée de Waterloo, B1640 Rhode Saint Genèse, Belgiumarts@vki.ac.be

J. Turbomach 127(3), 580-588 (Jan 10, 2005) (9 pages) doi:10.1115/1.1928933 History: Received January 19, 2004; Revised January 10, 2005

The present study deals with a detailed experimental investigation of the turbulent flow inside a rib-roughened turbine blade cooling channel. The measurements are carried out in a stationary straight channel with high blockage ribs installed on one wall. The main objective is to enhance the understanding and deepen the analysis of this complex flow field with the help of highly resolved particle image velocimetry measurements. A quasi-three-dimensional view of the flow field is achieved, allowing the identification of the main time-averaged coherent structures. The combined analysis of the present aerodynamic results with available heat transfer data emphasizes the role of the mean and fluctuating flow features in the heat transfer process. In particular, the stream wise/normal to the wall component of the Reynolds stress tensor is shown to be strictly related to the heat transfer rate on the channel surfaces. A correlation to estimate the heat transfer field from the aerodynamic data is presented for the high blockage rib roughened channel flow.

Copyright © 2005 by American Society of Mechanical Engineers
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References

Figures

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Figure 2

Mean inlet velocity and stream wise turbulence intensity profiles

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Figure 3

Wall static pressure distribution

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Figure 4

Friction factor evolution with Reynolds number

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Figure 5

Measurement planes for PIV

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Figure 6

Time averaged velocity field in plane 1xy

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Figure 7

Stream tracers visualization of the time averaged velocity field in plane 3xy

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Figure 8

Time averaged velocity field in plane 1xz

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Figure 9

Stream tracers visualization of the time averaged velocity field in plane 2xz

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Figure 10

Stream tracers visualization of the time averaged velocity field in plane 3xz

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Figure 11

Time averaged flow field in plane 1yz (left) and 2yz (right)

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Figure 12

Stream wise and vertical velocity distributions form planes –—1xy, – – – – 2xy, and – ∙ – ∙ – 3xy

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Figure 13

Stream wise (Tx=u′2¯∕U0, top) and vertical (Ty=v′2¯∕U0, bottom) velocity fluctuations in plane 1xy

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Figure 14

Reynolds stresses (Txy=−u′v′¯∕U02) in plane 1xy

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Figure 15

Span wise velocity fluctuations (Tz=w′2¯∕U0) in plane 1xz

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Figure 16

Vertical (Ty) and span wise (Tz) velocity fluctuations in plane 1yz

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Figure 17

Vertical (Ty) and span wise (Tz) velocity fluctuations in plane 2yz

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Figure 18

Comparison between Reynolds stresses and heat transfer (1)

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Figure 19

Comparison between Reynolds stresses and heat transfer (2)

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Figure 20

Correlation between ⟨u′v′⟩ Reynolds stresses component and Nu number distribution at different channel location

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Figure 21

Comparison between estimated (contour plot) and measured (contour lines from Çakan (1)) heat transfer rate on the ribbed surface of the channel

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