Aerodynamic Performance of Blade Tip End-Plates Designed for Low-Noise Operation in Axial Flow Fans
This study assesses the effectiveness of modified blade-tip configurations in achieving passive noise control in industrial fans. The concepts developed here, which are based on the addition of end-plates at the fan-blade tip, are shown to have a beneficial effect on the fan aeroacoustic signature a...
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| Veröffentlicht in: | Journal of fluids engineering 2009-08, Vol.131 (8), p.081101 (13 )-081101 (13 ) |
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| container_issue | 8 |
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| container_title | Journal of fluids engineering |
| container_volume | 131 |
| creator | Corsini, Alessandro Rispoli, Franco Sheard, A. G |
| description | This study assesses the effectiveness of modified blade-tip configurations in achieving passive noise control in industrial fans. The concepts developed here, which are based on the addition of end-plates at the fan-blade tip, are shown to have a beneficial effect on the fan aeroacoustic signature as a result of the changes they induce in tip-leakage-flow behavior. The aerodynamic merits of the proposed blade-tip concepts are investigated by experimental and computational studies in a fully ducted configuration. The flow mechanisms in the blade-tip region are correlated with the specific end-plate design features, and their role in the creation of overall acoustic emissions is clarified. The tip-leakage flows of the fans are analyzed in terms of vortex structure, chordwise leakage flow, and loading distribution. Rotor losses are also investigated. The modifications to blade-tip geometry are found to have marked effects on the multiple vortex behaviors of leakage flow as a result of changes in the near-wall fluid flow paths on both blade surfaces. The improvements in rotor efficiency are assessed and correlated with the control of tip-leakage flows produced by the modified tip end-plates. |
| doi_str_mv | 10.1115/1.3026723 |
| format | Article |
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The modifications to blade-tip geometry are found to have marked effects on the multiple vortex behaviors of leakage flow as a result of changes in the near-wall fluid flow paths on both blade surfaces. The improvements in rotor efficiency are assessed and correlated with the control of tip-leakage flows produced by the modified tip end-plates.</description><identifier>ISSN: 0098-2202</identifier><identifier>EISSN: 1528-901X</identifier><identifier>DOI: 10.1115/1.3026723</identifier><identifier>CODEN: JFEGA4</identifier><language>eng</language><publisher>New York, NY: ASME</publisher><subject>Acoustics ; Aeroacoustics, atmospheric sound ; Applied fluid mechanics ; Applied sciences ; Exact sciences and technology ; Flows in Complex Systems ; Fluid dynamics ; Fundamental areas of phenomenology (including applications) ; Hydraulic and pneumatic machinery ; Mechanical engineering. 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The tip-leakage flows of the fans are analyzed in terms of vortex structure, chordwise leakage flow, and loading distribution. Rotor losses are also investigated. The modifications to blade-tip geometry are found to have marked effects on the multiple vortex behaviors of leakage flow as a result of changes in the near-wall fluid flow paths on both blade surfaces. The improvements in rotor efficiency are assessed and correlated with the control of tip-leakage flows produced by the modified tip end-plates.</description><subject>Acoustics</subject><subject>Aeroacoustics, atmospheric sound</subject><subject>Applied fluid mechanics</subject><subject>Applied sciences</subject><subject>Exact sciences and technology</subject><subject>Flows in Complex Systems</subject><subject>Fluid dynamics</subject><subject>Fundamental areas of phenomenology (including applications)</subject><subject>Hydraulic and pneumatic machinery</subject><subject>Mechanical engineering. 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G</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Aerodynamic Performance of Blade Tip End-Plates Designed for Low-Noise Operation in Axial Flow Fans</atitle><jtitle>Journal of fluids engineering</jtitle><stitle>J. Fluids Eng</stitle><date>2009-08-01</date><risdate>2009</risdate><volume>131</volume><issue>8</issue><spage>081101 (13 )</spage><epage>081101 (13 )</epage><pages>081101 (13 )-081101 (13 )</pages><issn>0098-2202</issn><eissn>1528-901X</eissn><coden>JFEGA4</coden><abstract>This study assesses the effectiveness of modified blade-tip configurations in achieving passive noise control in industrial fans. The concepts developed here, which are based on the addition of end-plates at the fan-blade tip, are shown to have a beneficial effect on the fan aeroacoustic signature as a result of the changes they induce in tip-leakage-flow behavior. The aerodynamic merits of the proposed blade-tip concepts are investigated by experimental and computational studies in a fully ducted configuration. The flow mechanisms in the blade-tip region are correlated with the specific end-plate design features, and their role in the creation of overall acoustic emissions is clarified. The tip-leakage flows of the fans are analyzed in terms of vortex structure, chordwise leakage flow, and loading distribution. Rotor losses are also investigated. The modifications to blade-tip geometry are found to have marked effects on the multiple vortex behaviors of leakage flow as a result of changes in the near-wall fluid flow paths on both blade surfaces. The improvements in rotor efficiency are assessed and correlated with the control of tip-leakage flows produced by the modified tip end-plates.</abstract><cop>New York, NY</cop><pub>ASME</pub><doi>10.1115/1.3026723</doi></addata></record> |
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| ispartof | Journal of fluids engineering, 2009-08, Vol.131 (8), p.081101 (13 )-081101 (13 ) |
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| source | ASME Transactions Journals (Current) |
| subjects | Acoustics Aeroacoustics, atmospheric sound Applied fluid mechanics Applied sciences Exact sciences and technology Flows in Complex Systems Fluid dynamics Fundamental areas of phenomenology (including applications) Hydraulic and pneumatic machinery Mechanical engineering. Machine design Physics Pump and compressors (turbocompressors, fans, etc.) |
| title | Aerodynamic Performance of Blade Tip End-Plates Designed for Low-Noise Operation in Axial Flow Fans |
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