Design Selection and Analysis of a Swept and Leaned Stator Concept
Author: Edmane Envia
Publisher:
Published: 1998
Total Pages: 26
ISBN-13:
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Author: Edmane Envia
Publisher:
Published: 1998
Total Pages: 26
ISBN-13:
DOWNLOAD EBOOKAuthor: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
Published: 2018-08-16
Total Pages: 38
ISBN-13: 9781725641679
DOWNLOAD EBOOKThis 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: Kenneth C. Hall
Publisher: Springer Science & Business Media
Published: 2006-05-11
Total Pages: 605
ISBN-13: 1402046057
DOWNLOAD EBOOKThis textbook is a collection of technical papers that were presented at the 10th International Symposium on Unsteady Aerodynamics, Aeroacoustics, and Aeroelasticity of Turbomachines held September 8-11, 2003 at Duke University in Durham, North Carolina. The papers represent the latest in state of the art research in the areas of aeroacoustics, aerothermodynamics, computational methods, experimental testing related to flow instabilities, flutter, forced response, multistage, and rotor-stator effects for turbomachinery.
Author: Xiaofeng Sun
Publisher: Elsevier
Published: 2020-10-14
Total Pages: 558
ISBN-13: 012408074X
DOWNLOAD EBOOKFundamentals of Aeroacoustics with Applications to Aeropropulsion Systems from the Shanghai Jiao Tong University Press Aerospace series, is the go-to reference on the topic, providing a modern take on the fundamental theory and applications relating to prediction and control of all major noise sources in aeropropulsion systems. This important reference compiles the latest knowledge and research advances, considering both the physics of aerodynamic noise generation in aero-engines and related numerical prediction techniques. Additionally, it introduces new vortex sound interaction models, a transfer element method, and a combustion instability model developed by the authors. Focusing on propulsion systems from inlet to exit, including combustion noise, this new resource will aid graduate students, researchers, and R&D engineers in solving the aircraft noise problems that currently challenge the industry. Updates the knowledge-base on the sound source generated by aeropropulsion systems, from inlet to exit, including combustion noise Covers new aerodynamic noise control technology aimed at the low-noise design of next generation aero-engines, including topics such as aerodynamic noise and aero-engine noise control Includes new, cutting-edge models and methods developed by an author team led by the editor-in-chief of the Chinese Journal of Aeronautics and Astronautics Considers both the physics of aerodynamic noise generation in aero-engines and related numerical prediction techniques
Author: Malcolm J. Crocker
Publisher: John Wiley & Sons
Published: 2007-10-05
Total Pages: 1594
ISBN-13: 0471395994
DOWNLOAD EBOOKTwo of the most acclaimed reference works in the area of acoustics in recent years have been our Encyclopedia of Acoustics, 4 Volume set and the Handbook of Acoustics spin-off. These works, edited by Malcolm Crocker, positioned Wiley as a major player in the acoustics reference market. With our recently published revision of Beranek & Ver's Noise and Vibration Control Engineering, Wiley is a highly respected name in the acoustics business. Crocker's new handbook covers an area of great importance to engineers and designers. Noise and vibration control is one largest areas of application of the acoustics topics covered in the successful encyclopedia and handbook. It is also an area that has been under-published in recent years. Crocker has positioned this reference to cover the gamut of topics while focusing more on the applications to industrial needs. In this way the book will become the best single source of need-to-know information for the professional markets.
Author:
Publisher:
Published: 1992
Total Pages: 348
ISBN-13:
DOWNLOAD EBOOKAuthor: American Institute of Aeronautics and Astronautics
Publisher:
Published: 2006
Total Pages: 1024
ISBN-13:
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Publisher:
Published: 2001
Total Pages: 534
ISBN-13:
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Publisher:
Published: 1999-07
Total Pages: 1154
ISBN-13:
DOWNLOAD EBOOKAuthor: D. C. Evans
Publisher:
Published: 1972
Total Pages: 44
ISBN-13:
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