Wake Geometry Effects on Rotor Blade-vortex Interaction Noise Directivity
Author | : Ruth McVoy Martin |
Publisher | : |
Total Pages | : 32 |
Release | : 1990 |
Genre | : Rotors (Helicopters) |
ISBN | : |
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Author | : Ruth McVoy Martin |
Publisher | : |
Total Pages | : 32 |
Release | : 1990 |
Genre | : Rotors (Helicopters) |
ISBN | : |
Author | : Shyue-bin Chang |
Publisher | : |
Total Pages | : 354 |
Release | : 1985 |
Genre | : Aerodynamic noise |
ISBN | : |
Author | : Henry E. Jones |
Publisher | : |
Total Pages | : 96 |
Release | : 1997 |
Genre | : Unsteady flow (Aerodynamics) |
ISBN | : |
A study of the full-potential modeling of a blade-vortex interaction was made. A primary goal of this study was to investigate the effectiveness of the various methods of modeling the vortex. The model problem restricts the interaction to that of an infinite wing with an infinite line vortex moving parallel to its leading edge. This problem provides a convenient testing ground for the various methods of modeling the vortex while retaining the essential physics of the full three-dimensional interaction. A full-potential algorithm specifically tailored to solve the blade-vortex interaction (BVI) was developed to solve this problem. The basic algorithm was modified to include the effect of a vortex passing near the airfoil. Four different methods of modeling the vortex were used: (1) the angle-of-attack methods, (2) the lifting-surface method, (3) the branch-cut method, and (4) the split-potential method. A side-by-side comparison of the four models was conducted. these comparisons included comparing generated velocity fields, a subcritical interaction, and a critical interaction. The subcritical and critical interactions are compared with experimentally generate results. The split-potential model was used to make a survey of some of the more critical parameters which affect the BVI.
Author | : Stewart Glegg |
Publisher | : Academic Press |
Total Pages | : 554 |
Release | : 2017-02-15 |
Genre | : Science |
ISBN | : 0128097930 |
Aeroacoustics of Low Mach Number Flows: Fundamentals, Analysis, and Measurement provides a comprehensive treatment of sound radiation from subsonic flow over moving surfaces, which is the most widespread cause of flow noise in engineering systems. This includes fan noise, rotor noise, wind turbine noise, boundary layer noise, and aircraft noise. Beginning with fluid dynamics, the fundamental equations of aeroacoustics are derived and the key methods of solution are explained, focusing both on the necessary mathematics and physics. Fundamentals of turbulence and turbulent flows, experimental methods and numerous applications are also covered. The book is an ideal source of information on aeroacoustics for researchers and graduate students in engineering, physics, or applied math, as well as for engineers working in this field. Supplementary material for this book is provided by the authors on the website www.aeroacoustics.net. The website provides educational content designed to help students and researchers in understanding some of the principles and applications of aeroacoustics, and includes example problems, data, sample codes, course plans and errata. The website is continuously being reviewed and added to. Explains the key theoretical tools of aeroacoustics, from Lighthill’s analogy to the Ffowcs Williams and Hawkings equation Provides detailed coverage of sound from lifting surfaces, boundary layers, rotating blades, ducted fans and more Presents the fundamentals of sound measurement and aeroacoustic wind tunnel testing
Author | : United States. National Aeronautics and Space Administration |
Publisher | : |
Total Pages | : 256 |
Release | : 1988 |
Genre | : Aeronautics |
ISBN | : |