Design Selection And Analysis Of A Swept And Leaned Stator Concept Nasa Tm 1998 208662 Mar 1 1999 PDF Download
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Author | : United States. National Aeronautics and Space Administration |
Publisher | : |
Total Pages | : |
Release | : 1999* |
Genre | : |
ISBN | : |
Download DESIGN SELECTION AND ANALYSIS OF A SWEPT AND LEANED STATOR CONCEPT... NASA/TM-1998-208662... MAR. 1, 1999 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...
Author | : Edmane Envia |
Publisher | : |
Total Pages | : 26 |
Release | : 1998 |
Genre | : |
ISBN | : |
Download Design Selection and Analysis of a Swept and Leaned Stator Concept Book in PDF, ePub and Kindle
Author | : United States. National Aeronautics and Space Administration |
Publisher | : |
Total Pages | : |
Release | : 1999* |
Genre | : |
ISBN | : |
Download DESIGNING FOR CHANGE: MINIMIZING THE IMPACT OF CHANGING REQUIREMENTS IN THE LATER STAGES OF A SPACEFLIGHT... NASA/TM-1998-208466... MAR. 1, 1999 Book in PDF, ePub and Kindle
Author | : |
Publisher | : |
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