End-plate for noise-by-flow control in axial fans

Corsini, Alessandro; Sheard, Anthony G.

doi:10.3311/ppme.7039

Cited by 16 publications

(27 citation statements)

References 37 publications

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“…Quinlan and Bent [44] have proposed end-plates, and others have proposed various solutions in patents for industrial fans [45^8]. Corsini and Sheard [49] proposed the use of a three-dimensional end plate to promote simultaneously tip flow control and a turbulence screen etihancer. Fig.…”

Section: Baselinementioning

confidence: 99%

“…The different design criteria under scrutiny [49,[52][53][54] are intended to control the leaked flow and to induce a subtractionaddition of near-axis momentum to the tip vortex. As such, the new end-plate design concepts passively control the blade tip vortex swirl level and the new end-plate design enhances the mixing of coherent tip vortical structures with a favorable correlated sound field modulation [49,50,53,54], Corsini and Sheard [52] and Corsini et al, [50,55,56] have assessed the performance gains related to the development of endplate technology. The end-plate technology consists of a constant thickness end-plate that engineers originally designed for an industrial fan designated AC90/6/TF, Table 2,…”

Section: Fig 5 Tip End-plates Designed By Corsini Et Al [4950]mentioning

confidence: 99%

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A Critical Review of Passive Noise Control Techniques in Industrial Fans

Bianchi¹,

Corsini

Sheard³

2013

Journal of Engineering for Gas Turbines and Power

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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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Section: Baselinementioning

confidence: 99%

Section: Fig 5 Tip End-plates Designed By Corsini Et Al [4950]mentioning

confidence: 99%

A Critical Review of Passive Noise Control Techniques in Industrial Fans

Bianchi¹,

Corsini

Sheard³

2013

Journal of Engineering for Gas Turbines and Power

Self Cite

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“…(Uchida et al, 1985), to 0.6 for wing tip vortices with bubble or spiral type vortex breakdown (Garg & Leibovich, 1979). Figure 1 (right) depicts the end-plate geometries , 2011.…”

Section: Tip End-plate Aerodynamicsmentioning

confidence: 99%

“…In order to suppress the tip leakage vortex-bursting phenomenon in the fan rotor fitted with a base-line tip feature, the authors proposed new end-plate design concepts to exploit a passive control on vortex breakdown formation , 2011.…”

Section: Ac90/6 Datum Fanmentioning

confidence: 99%

“…The authors have deliberately designed the variation of thickness to control the chordwise evolution of the leakage vortex rotation number, here chosen as the metric for the vortex swirl level. The different design criteria under scrutiny , 2011Corsini et al, 2009a) are intended to control the leaked flow and to induce a subtractionaddition of near-axis momentum to the tip vortex. As such, the new end-plate design concepts comprise passive control of tip vortex swirl level to enhance the mixing of coherent tip vortical structures with a favourable correlated sound field modulation Corsini and Sheard, 2011).…”

Section: Introductionmentioning

confidence: 99%

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Synergistic Noise-By-Flow Control Design of Blade-Tip in Axial Fans: Experimental Investigation

Bianchi¹,

Corsini²,

Sheard³

2012

Noise Control, Reduction and Cancellation Solutions in Engineering

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Design of a Tip Appendage for the Control of Tip Leakage Vortices in Axial Flow Fans

Meyer¹,

Spuy²,

Meyer³

et al. 2021

Preprint

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This article reports on numerical investigations of passive control techniques used for the performance enhancement of a large diameter axial flow cooling fan through modification of the blade tip geometry. Using open-source software, a novel meshing strategy is developed to carry out both steady and unsteady numerical computations of a periodic section of an axial flow fan. Analyzing the flow near the blade tip with a reduction in tip clearance, two predominant flow phenomena are identified. These two flow phenomena are further investigated with the aim of controlling them through implementation of a tip appendage design. Both introduced end-plate designs indicate effective control of each relevant flow phenomena. The constant thickness (CT) end-plate design is found to increase all fan performance characteristics at lower than design point (DP) flowrates, while increasing the fan's peak efficiency plateau toward the rotor stall margin. However, none of the CT end-plate designs are able to improve the fan's performance characteristics at its DP. The introduction of a novel trailing-edge (TE) end-plate design is found to increase all fan performance characteristics across the entire evaluated stable operating range, with an indicated increase of 37.3 percent in total-to-static pressure rise and a 2.9 percentage point increase in total-to-static efficiency at the fan's DP flowrate. The aerodynamic performance results attest to the associated benefits of the investigated passive control techniques.

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End-plate for noise-by-flow control in axial fans

Abstract: The paper presents a design procedure for anti-vortex endplates

Cited by 16 publications

References 37 publications

A Critical Review of Passive Noise Control Techniques in Industrial Fans

A Critical Review of Passive Noise Control Techniques in Industrial Fans

Synergistic Noise-By-Flow Control Design of Blade-Tip in Axial Fans: Experimental Investigation

Design of a Tip Appendage for the Control of Tip Leakage Vortices in Axial Flow Fans

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