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Journal of Fluids Engineering | Volume 129 | Issue 8 | TECHNICAL PAPERS
TECHNICAL PAPERS

Unsteady Flow and Wake Transport in a Low-Speed Axial Fan With Inlet Guide Vanes

[+] Author and Article Information
Jesús Manuel Fernández Oro

Área de Mecánica de Fluidos, Universidad de Oviedo, Campus de Viesques, 33271, Gijón (Asturias), Spainjesusfo@uniovi.es

Katia María Argüelles Díaz, Carlos Santolaria Morros, Eduardo Blanco Marigorta

Área de Mecánica de Fluidos, Universidad de Oviedo, Campus de Viesques, 33271, Gijón (Asturias), Spain

J. Fluids Eng 129(8), 1015-1029 (Mar 15, 2007) (15 pages) doi:10.1115/1.2746920 History: Received December 05, 2006; Revised March 15, 2007
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The present study is focused on the analysis of the dynamic and periodic interaction between both fixed and rotating blade rows in a single stage, low-speed axial fan with inlet guide vanes. The main goal is placed on the characterization of the unsteady flow structures involved in an axial flow fan of high reaction degree, relating them to working point variations and axial gap modifications. For that purpose, an experimental open-loop facility has been developed to obtain a physical description of the flow across the turbomachine. Using hot-wire anemometry, measurements of axial and tangential velocities were carried out in two transversal sectors: one between the rows and the other downstream of the rotor, covering the whole span of the stage for a complete stator pitch. Ensemble- and time-averaging techniques were introduced to extract deterministic fluctuations from raw data, both of which are essential to understand flow mechanisms related to the blade passing frequency. An exhaustive analysis of the measured wakes has provided a comprehensive description of the underlying mechanisms in both wake-transport phenomena and stator-rotor interaction. In addition, unmixed stator wakes, observed at the rotor exit, have been treated in terms of dispersion and angular displacement to indicate the influence of the blades loading on the transport of the stator wake fluid. The final aim of the paper is to highlight a complete picture of the unsteady flow patterns inside industrial axial fans.
Copyright © 2007 by American Society of Mechanical Engineers
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References

Figures

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+Test facility
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Test facility
Figure 1

Test facility

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+Characteristics of vanes and blades
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Characteristics of vanes and blades
Figure 2

Characteristics of vanes and blades

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+Fan performance curves
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Fan performance curves
Figure 3

Fan performance curves

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+Sketch of the dual hot-wire probe. Measurement chain.
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Sketch of the dual hot-wire probe. Measurement chain.
Figure 4

Sketch of the dual hot-wire probe. Measurement chain.

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+Measuring sectors D (at stator exit) and R (at rotor exit)
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Measuring sectors D (at stator exit) and R (at rotor exit)
Figure 5

Measuring sectors D (at stator exit) and R (at rotor exit)

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+Throughflow at stator exit
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Throughflow at stator exit
Figure 6

Throughflow at stator exit

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+Throughflow incidence
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Throughflow incidence
Figure 7

Throughflow incidence

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+Throughflow at rotor exit
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Throughflow at rotor exit
Figure 8

Throughflow at rotor exit

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+Sketch of streamlines in the throughflow
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Sketch of streamlines in the throughflow
Figure 9

Sketch of streamlines in the throughflow

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+Influence of the rotor blockage on the time-averaged flow at different operating conditions
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Influence of the rotor blockage on the time-averaged flow at different operating conditions
Figure 10

Influence of the rotor blockage on the time-averaged flow at different operating conditions

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+Influence of the operating conditions on the radial migration of the stator wake-rotor blockage interaction
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Influence of the operating conditions on the radial migration of the stator wake-rotor blockage interaction
Figure 11

Influence of the operating conditions on the radial migration of the stator wake-rotor blockage interaction

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+Influence of the axial gap in the dispersion of stator wakes at different operating conditions for the midspan
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Influence of the axial gap in the dispersion of stator wakes at different operating conditions for the midspan
Figure 12

Influence of the axial gap in the dispersion of stator wakes at different operating conditions for the midspan

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+Radial evolution of the rotor wake structure
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Radial evolution of the rotor wake structure
Figure 13

Radial evolution of the rotor wake structure

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+Identification of the rotor wakes’ shear layers
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Identification of the rotor wakes’ shear layers
Figure 14

Identification of the rotor wakes’ shear layers

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+Radial distribution of the rotor wakes’ displacement thickness
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Radial distribution of the rotor wakes’ displacement thickness
Figure 15

Radial distribution of the rotor wakes’ displacement thickness

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+Radial distribution of the rotor wakes’ shape and energy factors
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Radial distribution of the rotor wakes’ shape and energy factors
Figure 16

Radial distribution of the rotor wakes’ shape and energy factors

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+Vorticity structure of boundary layers: casing viscous regions and wakes’ shear layers at rotor exit
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Vorticity structure of boundary layers: casing viscous regions and wakes’ shear layers at rotor exit
Figure 17

Vorticity structure of boundary layers: casing viscous regions and wakes’ shear layers at rotor exit

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+Unsteady flow patterns in axial and tangential velocity distributions at rotor exit
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Unsteady flow patterns in axial and tangential velocity distributions at rotor exit
Figure 18

Unsteady flow patterns in axial and tangential velocity distributions at rotor exit

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+Unsteady flow patterns at rotor exit as a function of the operating point in the case of reduced axial gap
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Unsteady flow patterns at rotor exit as a function of the operating point in the case of reduced axial gap
Figure 19

Unsteady flow patterns at rotor exit as a function of the operating point in the case of reduced axial gap

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+Temporal pitchwise distribution of axial velocity at the rotor exit for nominal conditions
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Temporal pitchwise distribution of axial velocity at the rotor exit for nominal conditions
Figure 20

Temporal pitchwise distribution of axial velocity at the rotor exit for nominal conditions

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+Sketch of the transport and convection of an IGV wake through a rotor passage
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Sketch of the transport and convection of an IGV wake through a rotor passage
Figure 21

Sketch of the transport and convection of an IGV wake through a rotor passage

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+Influence of the operating conditions in the wake transport at midspan
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Influence of the operating conditions in the wake transport at midspan
Figure 22

Influence of the operating conditions in the wake transport at midspan

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+Three-dimensional view of the stator wake transport downstream of the rotor
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Three-dimensional view of the stator wake transport downstream of the rotor
Figure 23

Three-dimensional view of the stator wake transport downstream of the rotor

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+Dispersion and angular displacement of unmixed stator wakes
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Dispersion and angular displacement of unmixed stator wakes
Figure 24

Dispersion and angular displacement of unmixed stator wakes

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