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Research Papers

Performance of Axial Fans in Close Proximity to the Electromagnetic Compatibility Screens

[+] Author and Article Information
R. Antón1

Mechanical Department,Thermal and Fluids Engineering Division,  TECNUN-University of Navarra, Paseo de Manuel Lardizábal 13, 20018 San Sebastián, Spainranton@tecnun.es

A. Bengoechea, A. Rivas, J. C. Ramos, G. S. Larraona

Mechanical Department,Thermal and Fluids Engineering Division,  TECNUN-University of Navarra, Paseo de Manuel Lardizábal 13, 20018 San Sebastián, Spain

1

Corresponding author.

J. Electron. Packag 134(1), 011004 (Mar 19, 2012) (8 pages) doi:10.1115/1.4005913 History: Received January 14, 2011; Revised November 02, 2011; Accepted November 03, 2011; Published March 07, 2012; Online March 19, 2012

The performance of axial fans in close proximity to the electromagnetic compatibility (EMC) screens was analyzed by means of an experimental parametric study. The following geometrical parameters were studied: the hub-to-tip ratio, the ratio between fan thickness and fan diameter, the porosity and thickness of the perforated plate, and finally, the distance between the perforated plate and the inlet and the outlet of the fan. Screen porosity was found to be the most important parameter. Fan performance degradation is expressed by means of two correlations: one for the deterioration in the fan pressure at the no-flow point and the other for the flow rate reduction at the free delivery point. Both correlations were formulated as functions of screen porosity and the distance between the fan and the screen. We believe that the correlations can serve as a good guide for correct fan placement in a telecommunications cabinet.

Copyright © 2012 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Top view of the wind tunnel

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Figure 2

Hole configuration

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Figure 3

Fan characteristic curve

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Figure 4

Example of fan characteristic curves

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Figure 5

Velocity profiles

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Figure 6

Evaluation of the correlation for μp,s,i . Observed values (%) correspond to the experiments. Predicted values (%) correspond to the values obtained from Eq. 1.

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Figure 7

Evaluation of the correlation for μp,s,o . Observed values (%) correspond to the experiments. Predicted values (%) correspond to the values obtained from Eq. 2.

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Figure 8

Evaluation of the correlation for μQ,i . Observed values (%) correspond to the experiments. Predicted values (%) correspond to the values obtained from Eq. 3.

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Figure 9

Evaluation of the correlation for μQ,o . Observed values (%) correspond to the experiments. Predicted values (%) correspond to the values obtained from Eq. 4.

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Figure 10

Influence of the porosity of an EMC screen placed at the fan inlet on the characteristic curve

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Figure 11

Influence of the porosity of an EMC screen placed at the fan inlet on the pressure and flow reduction coefficients

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Figure 12

Influence of the porosity of an EMC screen placed at the fan outlet on the characteristic curve

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Figure 13

Influence of the porosity of an EMC screen placed at the fan outlet on the pressure and flow reduction coefficients

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Figure 14

Two arrangements of fan and obstacle

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Figure 15

Influence of the distance between a fan and an EMC screen placed at the fan inlet on the characteristic curve

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Figure 16

Influence of the distance between a fan and an EMC screen placed at the fan inlet on the pressure and flow reduction coefficients

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Figure 17

Influence of the distance between a fan and an EMC screen placed at the fan outlet on the characteristic curve

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Figure 18

Influence of the distance between a fan and an EMC screen placed at the fan outlet on the pressure and flow reduction coefficients

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Figure 19

Effect of the thickness of an EMC screen placed close to fan inlet on fan performance

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Figure 20

Effect of the thickness of an EMC screen placed close to fan outlet on fan performance

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Figure 21

Influence of the rotational fan speed on fan performance (with an EMC screen at the inlet). Dimensional curves.

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Figure 22

Influence of the rotational fan speed on fan performance (with an EMC screen at the inlet). Nondimensional curves.

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Figure 23

Influence of the tip-to-hub ratio on fan performance (with an EMC screen at the outlet)

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