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TECHNICAL PAPERS

Flow Study in the Impeller–Diffuser Interface of a Vaned Centrifugal Fan

[+] Author and Article Information
Sofiane Khelladi

Laboratoire d’Energétique et de Mécanique des Fluides Interne,  Ecole Nationale Supérieure d’Arts et Métiers, 151 bd de l’Hôpital, 75013, Paris, Francesofiane.khelladi@paris.ensam.fr

Smaïne Kouidri, Farid Bakir, Robert Rey

Laboratoire d’Energétique et de Mécanique des Fluides Interne,  Ecole Nationale Supérieure d’Arts et Métiers, 151 bd de l’Hôpital, 75013, Paris, France

J. Fluids Eng 127(3), 495-502 (Mar 07, 2005) (8 pages) doi:10.1115/1.1900138 History: Received June 28, 2004; Revised March 06, 2005; Accepted March 07, 2005

In order to better understand the behavior of the fluid flow in vaned centrifugal fans, theoretical and experimental work has been carried out on unsteady three-dimensional (3D) flows. Particular attention is given to the flows located at the rotor–stator interface. This zone is the seat of strong interactions between the moving part and the fixed part. This phenomenon has as consequences: Strongly unsteady flow, fluctuating forces on the stator blades, and an efficiency decrease. This work is part of a project which main objective is the aeroacoustic optimization of high speed centrifugal fans. We present in this paper the first results, mainly aerodynamic ones, which will be used thereafter as an input data to aeroacoustic modeling. A numerical simulation tool was used in order to determine the kinematics and the dynamics of these flows. The measurements of the steady and unsteady flow characteristics allowed a comparison of the theoretical and experimental results.

Copyright © 2005 by American Society of Mechanical Engineers
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Figures

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Figure 1

Impeller, diffuser, and return channel

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Figure 2

(a) Centrifugal impeller, (b) diffuser and return channel

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Figure 3

Diagram of the test bench

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Figure 4

Fluid volume cross section

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Figure 5

Cross section of the centrifugal fan meshes

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Figure 6

Influence of grid size on the static pressure at the centrifugal fan inlet

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Figure 7

Convergence of the static pressure at the inlet of the impeller

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Figure 8

Aerodynamic characteristics of the centrifugal fan

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Figure 9

Streamline pattern at the impeller inlet. With axial gap (a), without axial gap (b) - flow rate =35l∕s

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Figure 10

Variation of the pressure at a point on the impeller–diffuser interface vs time-flow rate =35l∕s.

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Figure 11

Evolution of the static pressure in the curvilinear direction along the axial clearance of the diffuser-flow rate =35l∕s

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Figure 12

Axial clearance between the impeller and the casing

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Figure 13

Streamline pattern at axial cross section of the centrifugal fan-flow rate =35l∕s. (a)—The gap at the inlet side. (b)—Recirculation zone

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Figure 14

Instantaneous static pressure field and variation of the static pressure at impeller–diffuser interface—Flow rate =35l∕s

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Figure 15

Instantaneous velocity magnitude—flow rate =35l∕s

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Figure 16

Instantaneous turbulence Intensity—flow rate =35l∕s

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