Aerodynamics and Aeroacoustics of Rotorcraft (l' Aerodynamique Et L' Aeroacoustique Des Aeronefs a Voilure Tournante). PDF Download
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Author:
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ISBN:
Category :
Languages : en
Pages : 489
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Book Description
The aim of the symposium is to review and discuss recent developments in aerodynamics and aeroacoustics as they apply to the rotary-wing aircraft, and to foster the future development of this class of flight vehicles. The Symposium recognizes the importance of understanding and accurately predicting the aerodynamic and acoustic characteristics of military and civil rotorcraft; and the need for improved phenomenological insight, better math models, adequate test equipment, and more precise and efficient numerical methods. Despite current limitations, considerable progress has been made in many technological fields in the last decade. New test facilities and test stands have been constructed, improvements in aerodynamic theory and tools have led to a better understanding of noise generation phenomena, and Computational Fluid Dynamics (CFD) and Computational AeroAcoustics (CAA) have evolved into useful techniques for designers. The agenda of the Symposium was as follows: Opening Remarks Keynote Speech Keynote Paper Session 1, Dynamic Stall Session 2, Wind Turbines Session 3, Three-Dimensional Aerodynamic Prediction Methods Session 4 and 5, Experimental Investigations on Helicopter Rotors Session 6 and 8, Acoustic Prediction Methods Session 7, Interference Problems Closing Remarks (KAR) P. 11.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 489
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Book Description
The aim of the symposium is to review and discuss recent developments in aerodynamics and aeroacoustics as they apply to the rotary-wing aircraft, and to foster the future development of this class of flight vehicles. The Symposium recognizes the importance of understanding and accurately predicting the aerodynamic and acoustic characteristics of military and civil rotorcraft; and the need for improved phenomenological insight, better math models, adequate test equipment, and more precise and efficient numerical methods. Despite current limitations, considerable progress has been made in many technological fields in the last decade. New test facilities and test stands have been constructed, improvements in aerodynamic theory and tools have led to a better understanding of noise generation phenomena, and Computational Fluid Dynamics (CFD) and Computational AeroAcoustics (CAA) have evolved into useful techniques for designers. The agenda of the Symposium was as follows: Opening Remarks Keynote Speech Keynote Paper Session 1, Dynamic Stall Session 2, Wind Turbines Session 3, Three-Dimensional Aerodynamic Prediction Methods Session 4 and 5, Experimental Investigations on Helicopter Rotors Session 6 and 8, Acoustic Prediction Methods Session 7, Interference Problems Closing Remarks (KAR) P. 11.
Author: North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development
Publisher:
ISBN: 9789283600152
Category : Aerodynamic noise
Languages : en
Pages :
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Author: Harvey H. Hubbard
Publisher:
ISBN:
Category : Aerodynamic noise
Languages : en
Pages : 620
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Author: Kenneth C. Hall
Publisher: Springer Science & Business Media
ISBN: 1402046057
Category : Technology & Engineering
Languages : en
Pages : 605
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Book Description
This 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: Harvey H. Hubbard
Publisher:
ISBN:
Category : Aerodynamic noise
Languages : en
Pages : 616
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Author: William K. Blake
Publisher:
ISBN:
Category : Aerodynamic noise
Languages : en
Pages : 536
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Author: Jay C. Hardin
Publisher: Springer Science & Business Media
ISBN: 1461383420
Category : Science
Languages : en
Pages : 525
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Book Description
Computational aeroacoustics is rapidly emerging as an essential element in the study of aerodynamic sound. As with all emerging technologies, it is paramount that we assess the various opportuni ties and establish achievable goals for this new technology. Essential to this process is the identification and prioritization of fundamental aeroacoustics problems which are amenable to direct numerical siIn ulation. Questions, ranging from the role numerical methods play in the classical theoretical approaches to aeroacoustics, to the correct specification of well-posed numerical problems, need to be answered. These issues provided the impetus for the Workshop on Computa tional Aeroacoustics sponsored by ICASE and the Acoustics Division of NASA LaRC on April 6-9, 1992. The participants of the Work shop were leading aeroacousticians, computational fluid dynamicists and applied mathematicians. The Workshop started with the open ing remarks by M. Y. Hussaini and the welcome address by Kristin Hessenius who introduced the keynote speaker, Sir James Lighthill. The keynote address set the stage for the Workshop. It was both an authoritative and up-to-date discussion of the state-of-the-art in aeroacoustics. The presentations at the Workshop were divided into five sessions - i) Classical Theoretical Approaches (William Zorumski, Chairman), ii) Mathematical Aspects of Acoustics (Rodolfo Rosales, Chairman), iii) Validation Methodology (Allan Pierce, Chairman), iv) Direct Numerical Simulation (Michael Myers, Chairman), and v) Unsteady Compressible Flow Computa tional Methods (Douglas Dwoyer, Chairman).
Author: H.M. Atassi
Publisher: Springer Science & Business Media
ISBN: 1461393418
Category : Science
Languages : en
Pages : 876
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Book Description
The first International Symposium on Unsteady Aerodynamics and Aero elasticity of Turbomachines was held in Paris in 1976, and was followed by symposia at Lausanne in 1980, Cambridge in 1984, Aachen in 1987, Bei jing in 1989, and Notre Dame in 1991. The proceedings published following these symposia have become recognized both as basic reference texts in the subject area and as useful guides to progress in the field. It is hoped that this volume, which represents the proceedings of the Sixth International Symposium on Unsteady Aerodynamics of Turbomachines, will continue that tradition. Interest in the unsteady aerodynamics, aeroacoustics, and aeroelasticity of turbomachines has been growing rapidly since the Paris symposium. This expanded interest is reflected by a significant increase in the numbers of contributed papers and symposium participants. The timeliness of the topics has always been an essential objective of these symposia. Another important objective is to promote an international exchange between scien tists and engineers from universities, government agencies, and industry on the fascinating phenomena of unsteady turbomachine flows and how they affect the aeroelastic stability of the blading system and cause the radiation of unwanted noise. This exchange acts as a catalyst for the development of new analytical and numerical models along with carefully designed ex periments to help understand the behavior of such systems and to develop predictive tools for engineering applications.
Author: Andrew M. Wissink
Publisher:
ISBN:
Category : Parallel processing (Electronic computers)
Languages : en
Pages : 20
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Abstract: "This paper presents parallel implementations of two codes used in a combined CFD/Kirchhoff methodology to predict the aerodynamics and aeroacoustics properties of helicopters. The rotorcraft Navier-Stokes code, TURNS, computes the aerodynamic flowfield near the helicopter blades and the Kirchhoff acoustics code computes the noise in the far field, using the TURNS solution as input. The overall parallel strategy adds MPI message passing calls to the existing serial codes to allow for communication between processors. As a result, the total code modifications required for parallel execution are relatively small. The biggest bottleneck in running the TURNS code in parallel comes from the LU-SGS algorithm that solves the implicit system of equations. We use a new hybrid domain decomposition implementation of LU-SGS to obtain good parallel performance on the SP-2. TURNS demonstrates excellent parallel speedups for quasi-steady and unsteady three-dimensional calculations of a helicopter blade in forward flight. The execution rate attained by the code on 114 processors is six times faster than the same cases run on one processor of the Cray C-90. The parallel Kirchhoff code also shows excellent parallel speedups and fast execution rates. As a performance demonstration, unsteady acoustic pressures are computed at 1886 far-field observer locations for a sample acoustics problem. The calculation requires over two hundred hours of CPU time on one C-90 processor but takes only a few hours on 80 processors of the SP2. The resultant far-field acoustic field is analyzed with state-of-the-art audio and video rendering of the propagating acoustic signals."
Author: Stephen J. Owen
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages :
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