Experimental Study of Airfoil Trailing-edge Noise PDF Download
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Author: Mark B. Manley
Publisher:
ISBN:
Category :
Languages : en
Pages : 368
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Author: Mark B. Manley
Publisher:
ISBN:
Category :
Languages : en
Pages : 368
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Author: Gyuzel Yakhina
Publisher:
ISBN:
Category :
Languages : en
Pages : 191
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Book Description
The tonal trailing-edge noise generated by transitional airfoils is a topic of interest because of its wide area of applications. One of them is the Unmanned Air Vehicles operated at low Reynolds numbers which are widely used in our everyday life and have a lot of perspectives in future. The tonal noise reduction will increase the survivability and effectiveness of the devices in military field. Moreover it will enlarge the range of civil use and minimize noise pollution. The effective noise reduction is needed and therefore the complete understanding of the tonal noise generation process is necessary. Despite the fact that investigation of the trailing-edge noise was started since the seventies there are still a lot of details which should be explained. The present work is dedicated to the experimental and analytical investigation of the tonal noise and is a part of the collaboration project between Ecole Centrale de Lyon and Embry-Riddle Aerospace University. The aim is to conduct an exhaustive experimental characterization of the acoustic and aerodynamic parameters of the trailing-edge noise and to produce a data base which can be used for further numerical simulations conducted at Embry-Riddle Aerospace University. A symmetric NACA-0012 airfoil and a slightly cambered SD7003 airfoil at moderate angles of attack (varied from -10° à 10°) were tested in an open-jet anechoic wind tunnel of Ecole Centrale de Lyon at moderate Reynolds numbers (0.6x105
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 14
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Author: Marvin Raymond LaFontaine
Publisher:
ISBN:
Category :
Languages : en
Pages : 260
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Author: M. S. Howe
Publisher:
ISBN:
Category :
Languages : en
Pages : 48
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An analysis is made of the sound produced by low Mach number turbulent flow over an asymmetrically rounded trailing edge of an airfoil. Such airfoils are used in experimental studies of trailing edge noise and vortex shedding phenomena, and have a flat pressure side and a rounded, or 'beveled', suction surface at the trailing edge, so that in the immediate vicinity of the edge the airfoil has a wedge shaped profile. There are two principal interaction noise sources: a lift dipole associated with the unsteady transverse forces exerted on the airfoil, and a thickness dipole which radiates preferentially in the plane of the airfoil. The latter is usually negligible except possibly at low frequencies, and at large included angles of the trailing edge wedge. Detailed results are given for included angles of 90 deg and less. It is concluded that, for given turbulence intensity, surface beveling has a significant effect on the radiation only at sufficiently high frequencies that the trailing edge may be regarded as a straight-sided wedge over distances of the order of the turbulence length scale.
Author: Jaeha Ryi
Publisher:
ISBN:
Category : Technology
Languages : en
Pages :
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This chapter describes a wind tunnel experiment that was undertaken to investigate the changes in the aerodynamic performance of a wind turbine due to the inclusion of a 2-Dimension (2D) airfoil with a serrated trailing edge designed to reduce the noise caused by a wind turbine rotor blade. The restrictive condition for the serrated trailing edge equipped with the use of a 2D airfoil was examined through the use of a wind tunnel experiment after studying existing restrictive condition and analyzing prior research on serrated trailing edges. The study was conducted according to Howe's theory, which is a cornerstone of the study of noise reduction effects produced by a serrated trailing edge. For the serrated trailing edge equipped on a 2D airfoil, the wake distribution and the relation to noise were analyzed in order to determine the restrictive condition in accordance with Howe's theory. The results indicated that an empirical formula or a theoretical approach should consider changes in the boundary layer thickness of a 2D airfoil, so an empirical noise prediction formula is suggested for the serrated trailing edge. Also, a comparison and an analysis of the prediction and the experimental results for the noise produced by the NACA0012 or the baseline airfoil equipped with a serrated trailing edge suggested a novel formula for a 2D airfoil. Finally, the 2D airfoil noise data are compared with wind tunnel test data by using an empirical formula estimation method.
Author: Siegfried Wagner
Publisher: Springer Science & Business Media
ISBN: 3642887104
Category : Technology & Engineering
Languages : en
Pages : 216
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Book Description
Over the last five years an enormous number of wind turbines have been installed in Europe, bringing wind energy into public awareness. However, its further development is restricted mainly by public complaints caused by visual impact and noise. The European Commission has therefore funded a number of research projects in the field of wind turbine noise within the JOULE program. This book presents the most relevant results of these projects. The book addresses all relevant aspects of wind turbine noise, namely: noise reduction, noise propagation, noise measurement, and an introduction to aeroacoustics. It may serve as a first reference in the field of wind turbine noise for researchers, planners, and manufacturers.
Author: Joint Institute for Aeronautics and Acoustics. Joint Institute for Aeronautics and Acoustics
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 116
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 836
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Author: Yu Zhou
Publisher: Springer
ISBN: 366248868X
Category : Technology & Engineering
Languages : en
Pages : 433
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Book Description
These proceedings primarily focus on advances in the theory, experiments, and numerical simulations of turbulence in the contexts of flow-induced vibration and noise, as well as their control. Fluid-related structural vibration and noise problems are often encountered in many engineering fields, increasingly making them a cause for concern. The FSSIC conference, held on 5-9 July 2015 in Perth, featured prominent keynote speakers such as John Kim, Nigel Peake, Song Fu and Colin Hansen, as well as talks on a broad range of topics: turbulence, fluid-structure interaction, fluid-related noise and the control/management aspects of these research areas, many of which are clearly interdisciplinary in nature. It provided a forum for academics, scientists and engineers working in all branches of Fluid-Structure-Sound Interactions and Control (FSSIC) to exchange and share the latest developments, ideas and advances, bringing them together researchers from East and West to push forward the frontiers of FSSIC, ensuring that the proceedings will be of interest to a broad engineering community.
