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Research Papers: Forced Convection

Convective Heat Transfer in a Rotor Stator System Air Gap With Multiple Suctions of Fluid Through the Stator

[+] Author and Article Information
Julien Pellé1

 Université de Lille Nord de France, F-59000 Lille, France; TEMPO/DF2T, UVHC, F-59313 Valenciennes, Francejulien.pelle@univ-valenciennes.fr

Souad Harmand

 Université de Lille Nord de France, F-59000 Lille, France; TEMPO/DF2T, UVHC, F-59313 Valenciennes, Francesouad.harmand@univ-valenciennes.fr

1

Corresponding author.

J. Heat Transfer 133(7), 071707 (Apr 04, 2011) (9 pages) doi:10.1115/1.4003606 History: Received September 20, 2010; Revised February 07, 2011; Published April 04, 2011; Online April 04, 2011

The experimental work presented in this paper relates to the local convective heat transfer on the rotor surface in the airgap of a discoidal rotor stator system. The stator used in these experiments is a multiperforated disk in which an air suction due to the rotation of the rotor comes through and enters the airgap. A thermal balance equation was used to identify the local convective heat transfer coefficient, with temperatures as boundary conditions, which have been measured by infrared thermography. The influence of the suctions is discussed for an interdisk dimensionless spacing interval G ranging from 0.01 to 0.16 and for Re between 129,000 and 516,000. Results are compared with precedent studies in which we obtained Nusselt numbers with a closed rotor stator system in which stator is a full disk and a rotor stator system with one hole at the stator center. It is shown that multiperforated stator can or cannot improve the rotor cooling, depending on G and Re.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Velocity components in the air gap of a rotor stator system from Ref. 10

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Figure 2

Experimental setup: (a) RS configuration, (b) RS1 configuration, and (c) RSM configuration

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Figure 3

Mean Nusselt numbers for RSM configuration

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Figure 4

Mean Nusselt numbers—comparisons between RS, RS1, and RSM configurations: (a) Re=129,000, (b) Re=258,000, (c) Re=387,000, and (d) Re=516,000

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Figure 5

(a) Contours of ψ. (b) Areas defining the configurations providing the best Nu¯ delimited by line where ψ=1.

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Figure 6

Nusselt numbers in RSM configuration: (a) G=0.01, (b) G=0.02, (c) G=0.04, (d) G=0.08, and (e) G=0.16

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Figure 7

Local comparisons between RSM, RS1, and RS configurations: (a) Re=129,000 and G=0.01, (b) Re=516,000 and G=0.01, (c) Re=129,000 and G=0.04, (d) Re=516,000 and G=0.04, (e) Re=129,000 and G=0.16, and (f) Re=516,000 and G=0.16

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Figure 8

Best configuration for local Nusselt numbers: (a) G=0.01, (b) G=0.02, (c) G=0.04, and (d) G=0.08

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