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TECHNICAL PAPERS

Unsteady Flow Pattern Characteristics Downstream of a Forward-Curved Blades Centrifugal Fan

[+] Author and Article Information
Sandra Velarde-Suárez, Rafael Ballesteros-Tajadura, Carlos Santolaria-Morros

José González-Pérez

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

J. Fluids Eng 123(2), 265-270 (Dec 11, 2000) (6 pages) doi:10.1115/1.1351175 History: Received August 12, 1999; Revised December 11, 2000
Copyright © 2001 by ASME
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References

Cau,  G., Mandas,  N., Manfrida,  N., and Nurzia,  F., 1987, “Measurements of Primary and Secondary Flows in an Industrial Forward-Curved Centrifugal Fan,” ASME J. Fluids Eng., 109, pp. 353–358.
Chu,  S., Dong,  R., and Katz,  J., 1995, “Relationship Between Unsteady Flow, Pressure Fluctuations, and Noise in a Centrifugal Pump-Part A: Use of PDV Data to Compute the Pressure Field,” ASME J. Fluids Eng., 117, pp. 24–29.
Chu,  S., Dong,  R., and Katz,  J., 1995, “Relationship Between Unsteady Flow, Pressure Fluctuations, and Noise in a Centrifugal Pump-Part B: Effects of Blade-Tongue Interactions,” ASME J. Fluids Eng., 117, pp. 30–35.
Goto,  A., 1992, “Three-Dimensional Flow and Mixing in an Axial Flow Compressor with Different Rotor Tip Clearances,” ASME J. Turbomach., 114, pp. 675–685.
Liu, B., Moore, J. G., and Moore, J., 1998, “Total Unsteadiness Downstream of an Axial Compressor Rotor,” AIAA Paper No. 98-0967.
Moore, J., and Moore, J. G., 1998, “Turbulence energy and spectra downstream of an Axial Compressor Rotor,” AIAA Paper No. 98-2550.
Pinarbasi,  A., and Johnson,  M. W., 1994, “Detailed Flow Measurements in a Centrifugal Compressor Vaneless Diffuser,” ASME J. Fluids Eng., 116, pp. 453–461.
Ubaldi,  M., Zunino,  M., and Cattanei,  A., 1993, “Relative Flow and Turbulence Measurements Downstream of a Backward Centrifugal Impeller,” ASME J. Turbomach., 115, pp. 543–551.
Ubaldi,  M., Zunino,  M., Barigozzi,  G., and Cattanei,  A., 1996, “An Experimental Investigation of Stator Induced Unsteadiness on Centrifugal Impeller Outflow,” ASME J. Turbomach., 118, pp. 41–54.
British Standard BS-848, 1980, “Fans for General Purposes. Part 1. Methods of Testing Performance.”
British Standard BS-848, 1985, “Fans for General Purposes. Part 2. Methods of Noise Testing.”
Neise, W., 1992, “Review of Fan Noise Generations Mechanisms and Control Methods,” Proceedings of the SFA Symposium on Fan Noise, Senlis, France.
Comte-Bellot,  G., 1975, “Hot-Wire Anemometry,” Annu. Rev. Fluid Mech., 8, pp. 209–231.
Blanco,  E., Ballesteros,  R., and Santolaria,  C., 1998, “Angular Range and Uncertainty Analysis of Non-Orthogonal Crossed Hot Wire Probes,” ASME J. Fluids Eng., 120, pp. 90–94.
Velarde-Suárez, S., 1997, “Comportamiento Aeroacústico de Ventiladores Inestables,” Ph.D. Thesis (in Spanish), Universidad de Oviedo, Spain.
Velarde-Suárez,  S., Santolaria-Morros,  C., and Ballesteros-Tajadura,  R., 1999, “Experimental Study on the Aeroacoustic Behavior of a Forward-Curved Centrifugal Fan,” ASME J. Fluids Eng., 121, pp. 276–281.

Figures

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Shaft power and SWL versus flow rate
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Measurements points and absolute velocity at impeller outlet, 0.7×Qo
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Mean relative flow angle closer to impeller outlet (with respect to the tangential direction; radial location RI=1.05 R2)
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Circumferential distribution of velocity unsteadiness in the radial direction (radical location RI=1.05 R2)
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Circumferential distribution of velocity unsteadiness in the tangential direction (radial location RI=1.05 R2)
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Circumferential distribution of velocity unsteadiness in the radial direction (radial location RE=1.2 R2)
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Blade-to-blade distribution of mean tangential component of velocity and velocity unsteadiness in the tangential direction at the position 12 I
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Power spectrum of velocity fluctuation in the tangential direction at the position 6 I, 0.4×Qo
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Power spectrum of velocity fluctuation in the tangential direction at the position 12 I, 0.4×Qo
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Power spectrum of velocity fluctuation in the tangential direction at the position 6 E, 0.4×Qo
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Power spectrum of velocity fluctuation in the tangential direction at the position 12 E, 0.4×Qo
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Total differential pressure and efficiency versus flow rate
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Circumferential distribution of velocity unsteadiness in the tangential direction (radial location RE=1.2 R2)
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Blade-to-blade distribution of mean radial component of velocity and velocity unsteadiness in the radial direction at the position 6 I
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Blade-to-blade distribution of mean tangential component of velocity and velocity unsteadiness in the tangential direction at the position 6 I
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Blade-to-blade distribution of mean radial component of velocity and velocity unsteadiness in the radial direction at the position 12 I

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