Analytical Assessment Of Stator Sweep And Lean In Reducing Rotor Stator Tone Noise PDF Download
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Author | : E. Envia |
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Total Pages | : |
Release | : 1996 |
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Download Analytical Assessment of Stator Sweep and Lean in Reducing Rotor-stator Tone Noise Book in PDF, ePub and Kindle
Author | : National Aeronautics and Space Administration (NASA) |
Publisher | : Createspace Independent Publishing Platform |
Total Pages | : 38 |
Release | : 2018-08-16 |
Genre | : |
ISBN | : 9781725641679 |
Download Design Selection and Analysis of a Swept and Leaned Stator Concept Book in PDF, ePub and Kindle
This report describes a theoretical design and analysis study of the benefits of vane sweep and lean for reducing rotor- stator interaction tone noise. It is shown that the kinematic relationship between the rotor wakes and stator vanes is the principal factor in determining the achievable noise reductions. Vane sweep and lean control rotor wake skewing as seen by the stator vanes and hence influence the number of wake intersections per vane. An increase in the number of intersections reduces noise levels. Hence, to reduce rotor-stator noise, van sweep and lean must be chosen in such a way as to increase wake intersections per vane. A simple design rule is thus proposed which requires a sweep configuration that puts the vane tip downstream of its root and a vane lean that is in the direction of the rotor rotation. A detailed comparison of the predicted and measured noise reductions for a swept and leaned stator is then carried out. Overall, these comparisons show that the predicted benefits of a swept and leaned stator are in good agreement, qualitative as well as quantitative, with the measured reductions for the fan speeds relevant to noise certification procedure. Furthermore, the results also demonstrate the validity of design criterion and the theoretical tools used in this study. Envia, Edmane and Nallasamy, M. Glenn Research Center NASA/TM-1998-208662, NAS 1.15:208662, E-11383 RTOP 538-03-11...
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Total Pages | : 26 |
Release | : 2002 |
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Download Acoustic Benefits of Stator Sweep and Lean for a High Tip Speed Fan Book in PDF, ePub and Kindle
Author | : Edmane Envia |
Publisher | : |
Total Pages | : 26 |
Release | : 1998 |
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Download Design Selection and Analysis of a Swept and Leaned Stator Concept Book in PDF, ePub and Kindle
Author | : |
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Total Pages | : 28 |
Release | : 2002 |
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Download Fan Noise Source Diagnostic Test: Tone Modal Structure Results Book in PDF, ePub and Kindle
Author | : Edmane Envia |
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Total Pages | : 18 |
Release | : 2001 |
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Download Fan Noise Reduction: An Overview Book in PDF, ePub and Kindle
Author | : |
Publisher | : |
Total Pages | : 28 |
Release | : 1996 |
Genre | : |
ISBN | : |
Download Comparison of Predicted Low Speed Fan Rotor/Stator Interaction Modes to Measured Book in PDF, ePub and Kindle
Author | : |
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Total Pages | : 612 |
Release | : 1996 |
Genre | : Aerodynamic noise |
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Download 2nd AIAA/CEAS Aeroacoustics Conference Book in PDF, ePub and Kindle
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Total Pages | : 34 |
Release | : 2002 |
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Download Fan Noise Source Diagnostic Test: Far-Field Acoustic Results Book in PDF, ePub and Kindle
Author | : |
Publisher | : |
Total Pages | : 534 |
Release | : 2001 |
Genre | : Aeronautics |
ISBN | : |
Download 39th AIAA Aerospace Sciences Meeting and Exhibit Book in PDF, ePub and Kindle