Benefits of Swept-and-Leaned Stators for Fan Noise Reduction

Woodward, Richard P.; Elliott, David; Hughes, Christopher E.; Berton, Jeffrey J.

doi:10.2514/2.2883

Cited by 50 publications

(34 citation statements)

References 3 publications

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“…This is higher than the M -0.1 used in Ref. 10. However, the higher free stream Mach number primarily affects the flow external to the engine, including the stagnation point on the cowl.…”

Section: Description Of the Test Casementioning

confidence: 91%

See 1 more Smart Citation

Predicting the rotor-stator interaction acoustics of a ducted fan engine

Teszka

Christopher

Gary

et al. 2001

39th Aerospace Sciences Meeting and Exhibit

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“…This is higher than the M -0.1 used in Ref. 10. However, the higher free stream Mach number primarily affects the flow external to the engine, including the stagnation point on the cowl.…”

Section: Description Of the Test Casementioning

confidence: 91%

“…An advanced high bypass subsonic fan was designed and built by the Allison Engine Company under contract to NASA Glenn Research Center, as described by Woodward et al 10 The fan has 18 rotor blades with a diameter of 22 in. (0.559 m), and 42 stator vanes.…”

Section: Description Of the Test Casementioning

confidence: 99%

Predicting the rotor-stator interaction acoustics of a ducted fan engine

Teszka

Christopher

Gary

et al. 2001

39th Aerospace Sciences Meeting and Exhibit

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“…Transactions of the ASME allowing blade count reduction and broadband noise reduction while cutting on the first blade passing frequency [28].…”

Section: Passive Flow Control For Noise Reductionmentioning

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

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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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“…Consequently, there is an additional decrease in the sound wave amplitude. The fan model (D=0.559 m or 22 inches) installed in a wind tunnel is used to study the effect of swept-andleaned stators [6,7]. Three stator configurations are the following: the reference version with radial vanes, the second version with swept vanes (by 30°), and the third version with swept (by 30°) and leaned (by 30°) vanes.…”

Section: Introductionmentioning

confidence: 99%

Aircraft Fan Noise Reduction Technology Using Leaned Stator Blades

Pochkin

Khaletskiy

2015

Procedia Engineering

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The experimental investigation of leaned bypass stator vanes impact on the fan model acoustic and aerodynamic performance was carried out for the purpose of noise reduction technology development for advanced turbofan engine. It was studying three versions of bypass duct guide vanes of fan model with pressure ratio 1.54, tip speed 390 m/s and inlet diameter 700 mm. The fan model reference configuration has the blades swept back in the meridional direction (the sweep angle is equal to 18.3 degrees). The blade aspect ratio is equal to 2.13; blades count is equal to 41. The blade has approximately the same profiles along the blade height with the maximal thickness 5.3%. The second configuration of bypass stator was obtained by blade tip and hub profile displacement in circumferential direction clockwise and counter clockwise accordingly in such a manner that the tilt angle between the blade centreline and the radial direction kept constant and equal to +30 degrees. At last, the third configuration of bypass stator was obtained by blade tip and hub profile displacement in circumferential direction counter clockwise and clockwise accordingly in such a manner that the tilt angle between the blade centreline and the radial direction kept constant and equal to 30 degrees. Spectra and directivity diagrams of three versions of fan model measured in the anechoic chamber of C-3A test facility were analyzed. It was obtained, that the stator version leaned in the direction of rotation showed noise reduction relative to the reference stator version; on the contrary the stator version leaned counter to the direction of rotation showed increased noise levels. More noticeable these trends appear at approach mode in rear hemisphere.

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Benefits of Swept-and-Leaned Stators for Fan Noise Reduction

Cited by 50 publications

References 3 publications

Predicting the rotor-stator interaction acoustics of a ducted fan engine

Predicting the rotor-stator interaction acoustics of a ducted fan engine

A Critical Review of Passive Noise Control Techniques in Industrial Fans

Aircraft Fan Noise Reduction Technology Using Leaned Stator Blades

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