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Technology Reviews

A Critical Review of Passive Noise Control Techniques in Industrial Fans

[+] Author and Article Information
Alessandro Corsini

Dipartimento di Ingegneria Meccanica e Aerospaziale,
Sapienza University of Rome,
Via Eudossiana, 18
Rome I-00184, Italy

A.G. Sheard

Fläkt Woods Limited,
Axial Way,
Colchester CO4 5AR, UK

1Currently Rolls Royce plc, Derby, UK

Contributed by the Turbomachinery Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received September 30, 2013; final manuscript received October 5, 2013; published online December 12, 2013. Editor: David Wisler.

J. Eng. Gas Turbines Power 136(4), 044001 (Dec 12, 2013) (9 pages) Paper No: GTP-13-1352; doi: 10.1115/1.4025837 History: Received September 30, 2013; Revised October 05, 2013

This review aims to assist engineers in understanding and applying passive solutions for reducing industrial fan noise. The paper systematically reviews the extant literature on passive noise techniques, with a particular focus on experimental rather than theoretical research. The review provides an assessment of the current state of the art in industrial fan flow and noise control. It offers a vision for potential improvements in noise reduction via novel application of flow and noise control technologies. The review examines the interaction between aerodynamic cause and acoustic effect and the application of control technologies that current cause and effect theories have inspired. The purpose is to provide a vision for aerodynamics research during the next decade that will serve as a basis for systematically reducing industrial fan noise emissions. The review provides an assessment of recent flow and noise control advances and considers some opportunities for future research. The review reflects an emphasis on low-speed industrial fans. The authors consider high-speed turbomachinery noise control, with the objective of illustrating the linkages between the two technologies. The review concludes with a summary of the opportunities for future research and its application to flow and noise control in industrial fan design.

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Figures

Grahic Jump Location
Fig. 1

Low count/swept OGC after [36]

Grahic Jump Location
Fig. 2

Chevron nozzles (NASA)

Grahic Jump Location
Fig. 3

Crenulated trailing edge

Grahic Jump Location
Fig. 4

Blade with leading edge bumps [43]

Grahic Jump Location
Fig. 5

Tip end-plates designed by Corsini et al. [49,50]

Grahic Jump Location
Fig. 6

Trailing edge blowing [77]

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