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Flows in Complex Systems

Flow in a Single Stage Centrifugal Fan With Vaneless Diffuser and Peripheral Louver Outlets

[+] Author and Article Information
Hongmin Li

ECR International, 2201 Dwyer Avenue, Utica, NY 13504HL3@uakron.edu

J. Fluids Eng. 134(10), 101101 (Sep 28, 2012) (8 pages) doi:10.1115/1.4006695 History: Received March 18, 2010; Revised January 18, 2012; Published September 24, 2012; Online September 28, 2012

This paper presents an analysis on the air flows in a single stage centrifugal fan with a vaneless diffuser and peripheral louver outlets. The performance data of the fan are obtained experimentally. A numerical fluid flow model is developed. The agreements between the numerical and experimental results are reasonably good. The performances of the fan under various working conditions are explained by the flow structures and pressure distributions. Flow energy analysis shows that the major energy losses in the fan are the impeller loss, the diffuser loss, and the gap leakage loss. Suggestions on the design and application of fans with such architecture are given.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

The single-stage motor-fan system with peripheral louver outlets. (a) The commercially available unit. (b) The three-dimensional domain of the numerical model.

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Figure 2

Experimental data. (a) Results of speed torque test. (b) Results of system performance box test.

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Figure 3

Comparisons between the experimental data and the model predictions. (a) Fan-side efficiency. (b) Impeller shaft work.

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Figure 4

The gap leakage flow. (a) Energy loss. (b) The leakage flow rate. (c) Flow structure at 19.1 mm orifice. (d) Pressure distribution at 19.1 mm orifice.

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Figure 5

Flow energy losses in the impeller

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Figure 6

Flow directions at the leading and trailing edges of the blades. (a), (a′) Dorif  = 15.9 mm. (b), (b′) Dorif  = 19.1 mm. (c), (c′) Dorif  = 38.1 mm.

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Figure 7

Relative flow velocity variation in the impeller. Dorif  = 19.1 mm.

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Figure 8

The flow structures (a), (c) and pressure distributions (b), (d) in the eye region of the impeller. (a), (b) Dorif  = 19.1 mm. (c), (d) Dorif  = 38.1 mm.

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Figure 9

Flow in the vaneless diffuser. (a) Energy losses at various orifices. (b) Flow structure at 19.1 mm orifice. (c) Velocity magnitude distribution. (d) Pressure distribution.

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Figure 10

Fluid particle lines in the diffuser. Dorif  = 19.1 mm.

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Figure 11

The dynamic energy at the louver openings

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Figure 12

Flow structure (a) and pressure variation (b) at the louver openings. Dorif  = 19.1 mm.

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