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Author : Manuel Lanuza Fabregat
Publisher :
ISBN 13 :
Total Pages : 50 pages
Book Rating : 4.:/5 (84 download)
Download or read book Design of a High Performance Low Aerodynamic Noise Axial Flow Fan written by Manuel Lanuza Fabregat and published by . This book was released on 2007 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : R. A. Wallis
Publisher : Academic Press
ISBN 13 : 1483274225
Total Pages : 381 pages
Book Rating : 4.4/5 (832 download)
Download or read book Axial Flow Fans written by R. A. Wallis and published by Academic Press. This book was released on 2014-05-12 with total page 381 pages. Available in PDF, EPUB and Kindle. Book excerpt: Axial Flow Fans: Design and Practice focuses on the design of axial flow fans and the practices involved in their applications. The manuscript first offers information on the fluid mechanics of ducted fans, boundary layer and skin friction relations, and aerofoil data for blade design. Discussions focus on flow deflection in cascade of aerofoils, pitching moment, lift, surface roughness in turbulent boundary layers, turbulent boundary layers in pressure gradients, laminar skin friction, viscosity and boundary layers, and similarity and non-dimensional numbers. The text then ponders on vortex flows in ducting and fan, ducts, and introduction to fan design methods. The book takes a look at the momentum and blade element considerations on free vortex flow of rotor and rotor losses. Topics include momentum considerations, profile drag, tip clearance losses, optimum conditions in terms of the flow and swirl coefficients, pressure relations and velocity vectors, and thrust and torque gradients. Tail fairing design and associated losses, overall efficiencies, torque, thrust, and power, and the design of fan unit with arbitrary vortex flow are also discussed. The publication is a dependable source of information for engineers and readers interested in the design of axial flow fans and practices involved in their operation.
Author : Stephen S. Kajencki
Publisher :
ISBN 13 :
Total Pages : 294 pages
Book Rating : 4.:/5 (92 download)
Download or read book The Aerodynamic Design of a High-efficiency High-capacity Axial Flow Fan written by Stephen S. Kajencki and published by . This book was released on 1959 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Thomas Carolus
Publisher : Springer Vieweg
ISBN 13 : 9783658379582
Total Pages : 0 pages
Book Rating : 4.3/5 (795 download)
Download or read book Fans written by Thomas Carolus and published by Springer Vieweg. This book was released on 2022-12-24 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This textbook combines in a unique concept the design and construction of radial and axial fans with the problem of noise generation as well as its mitigation already in the fan development stage. The aim is to describe selected, easily applicable methods of aerodynamic design and noise prediction and to demonstrate their physical principles. Exercises with solutions facilitate understanding. The completely revised and expanded edition now also includes guidance on selecting fans for a given task, simulation-based optimization methods for fan design, and psychoacoustic methods that can be used to measure the quality of fan noise. This book is a translation of the original German 4th edition Ventilatoren by Thomas Carolus, published by Springer Fachmedien Wiesbaden GmbH, part of Springer Nature in 2020. The translation was done with the help of artificial intelligence (machine translation by the service DeepL.com). A subsequent human revision was done primarily in terms of content, so that the book will read stylistically differently from a conventional translation. Springer Nature works continuously to further the development of tools for the production of books and on the related technologies to support the authors.
Author : R. A. Wallis
Publisher : Wiley-Interscience
ISBN 13 :
Total Pages : 464 pages
Book Rating : 4.:/5 (318 download)
Download or read book Axial Flow Fans and Ducts written by R. A. Wallis and published by Wiley-Interscience. This book was released on 1983-09-23 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt: Covers the theory, design, analysis, testing, and research of axial flow fans. Contains up-to-date data on recent developments in the field. Interrelates fan and duct design techniques. Discusses commercial and product development test procedures. Covers future experimental research objectives. Includes a reference section on F-series of airfoils.
Author :
Publisher :
ISBN 13 :
Total Pages : 1572 pages
Book Rating : 4.:/5 (31 download)
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1992 with total page 1572 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book DESIGN AND PERFORMANCE ANALYSIS OF A REVERSIBLE AXIAL FLOW FAN. written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Reversible axial flow fans are used as emergency ventilation fans to discharge the smoke generated on the probable fires occurring in the underground transportation systems and mines as quickly as possible, without causing any harm to people exposed to it. The fans which are placed in different configurations according to the location of fire must be able to work bi-directionally, namely reversible. Due to this fact, the blade profiles of the fan must possess the same aerodynamic performance while working on either discharge or suction condition of the fan, dictated by direction of the rotation. This manuscript consists of the computation of the aerodynamic performances of symmetrical blade profiles of fully reversible axial fans by computational fluid mechanics (CFD) methods, developing a methodology for the design of reversible axial fans and analysis of the designed fan with CFD methods. The aerodynamic performances of the blade cascades are evaluated using FLUENT 6.0 software for different Reynolds numbers, solidities and angle of attacks of the cascade. The results of these computations are embedded into the developed methodology. Performance analysis of the reversible axial flow fan, which is designed with the developed methodology, is done with CFD techniques.
Author :
Publisher :
ISBN 13 :
Total Pages : 814 pages
Book Rating : 4.:/5 (319 download)
Download or read book NASA Technical Paper written by and published by . This book was released on 1978 with total page 814 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 564 pages
Book Rating : 4.:/5 (317 download)
Download or read book Design of a Low Speed Fan Stage for Noise Suppression written by and published by . This book was released on 1999 with total page 564 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Thomas J. Mueller
Publisher : Springer Science & Business Media
ISBN 13 : 3662050587
Total Pages : 327 pages
Book Rating : 4.6/5 (62 download)
Download or read book Aeroacoustic Measurements written by Thomas J. Mueller and published by Springer Science & Business Media. This book was released on 2013-11-27 with total page 327 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book describes recent developments in aeroacoustic measurements in wind tunnels and the interpretation of the resulting data. The reader will find the latest measurement techniques described along with examples of the results.
Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781726187411
Total Pages : 50 pages
Book Rating : 4.1/5 (874 download)
Download or read book Aerodynamic Performance Measurements for a Forward Swept Low Noise Fan written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-08-29 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt: One source of noise in high tip speed turbofan engines, caused by shocks, is called multiple pure tone noise (MPT's). A new fan, called the Quiet High Speed Fan (QHSF), showed reduced noise over the part speed operating range, which includes MPT's. The QHSF showed improved performance in most respects relative to a baseline fan; however, a partspeed instability discovered during testing reduced the operating range below acceptable limits. The measured QHSF adiabatic efficiency on the fixed nozzle acoustic operating line was 85.1 percent and the baseline fan 82.9 percent, a 2.2 percent improvement. The operating line pressure rise at design point rotational speed and mass flow was 1.764 and 1.755 for the QHSF and baseline fan, respectively. Weight flow at design point speed was 98.28 lbm/sec for the QHSF and 97.97 lbm/sec for the baseline fan. The operability margin for the QHSF approached 0 percent at the 75 percent speed operating condition. The baseline fan maintained sufficient margin throughout the operating range as expected. Based on the stage aerodynamic measurements, this concept shows promise for improved performance over current technology if the operability limitations can be solved.Fite, E. BrianGlenn Research CenterAERODYNAMIC CHARACTERISTICS; TURBOFAN ENGINES; FAN BLADES; NOISE GENERATORS; AERODYNAMIC NOISE; ACOUSTIC DELAY LINES; MASS FLOW; VORTICES; TIP SPEED...
Author : Emanuel Boxer
Publisher :
ISBN 13 :
Total Pages : 28 pages
Book Rating : 4.3/5 (91 download)
Download or read book Influence of Wall Boundary Layer Upon the Performance of an Axial-flow Fan Rotor written by Emanuel Boxer and published by . This book was released on 1951 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental investigation has been conducted to determine the effects of the wall boundary layer upon the performance of an axial-flow fan rotor. Tests were conducted at low Mach numbers and at one blade angle on a fan designed to have uniform downstream tangential velocity. The maximum disturbed-flow region of the six boundary-layer configurations tested exceeded one-half of the annular width of the duct and the peak efficiency was reduced 2 1/2 percent for this condition. The over-all loss in efficiency may possibly be reduced by decreasing the blade pitch angle in the boundary-layer region to conform to the upstream velocity profile.
Author : James G. Lucas
Publisher :
ISBN 13 :
Total Pages : 24 pages
Book Rating : 4.:/5 (31 download)
Download or read book Forward Acoustic Performance of a Model Turbofan Designed for a High Specific Flow (QF-14) written by James G. Lucas and published by . This book was released on 1982 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Lewis Research Center
Publisher :
ISBN 13 :
Total Pages : 356 pages
Book Rating : 4.:/5 (31 download)
Download or read book Bibliography of Lewis Research Center Technical Publications Announced in 1977 written by Lewis Research Center and published by . This book was released on 1978 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt: This compilation of abstracts describes and indexes over 780 technical reports resulting from the scientific and engineering work performed and managed by the Lewis Research Center in 1977. All the publications were announced in the 1977 issues of STAR (Scientific and Technical Aerospace Reports) and/or IAA (International Aerospace Abstracts). Documents cited include research reports, journal articles, conference presentations, patents and patent applications, and theses.
Author : Chen Wang
Publisher :
ISBN 13 : 9781361033272
Total Pages : pages
Book Rating : 4.0/5 (332 download)
Download or read book Noise Source Analysis and Control for Small Axial-Flow Fans written by Chen Wang and published by . This book was released on 2017-01-26 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Noise Source Analysis and Control for Small Axial-flow Fans" by Chen, Wang, 王晨, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Fan noise is always an important topic in applications ranging from small cooling fans for computers, transport vehicles and machinery, and building ventilation fans, to large compressors and turbo-engine fans in aircraft. When air flow with higher pressure or larger flow rate is needed in some operating conditions, two fans in series or a contra-rotating fan is often adopted. The purpose of this project is to conduct the noise source analysis for two identical small axial-flow cooling fans and a newly designed small axial-flow contra-rotating fan (both about 120 mm in diameter), and to explore some passive methods to reduce the more complex radiated noise, compared with that encountered in a conventional single fan. For two fans in series, a technique of synchronous averaging with time-base stretching is used to decompose the raw sound signals into various noise source components. Acoustic directivity measurements are conducted for two operating conditions: free space and its usual working condition; each condition with two different configurations: free (unobstructed) inlet and distorted inlet by a flat plate covering part of inlet area. For both operating conditions, the rotary noise from the downstream fan dominates over that from the upstream fan for unobstructed inlet while the dominance by the downstream fan is reversed with distorted inlet. The total noise, total broadband noise and rotary noise radiated by the upstream fan all increase gradually with decreased plate-fan spacing. However, the rotary noise radiated by downstream fan is hardly affected by the obstacle plate, whatever the plate-fan spacing is. The flow straightener between the two fans contributes to considerable improvement of aerodynamic performance for free inlet case, while it has a limited role in remedying the severe inlet distortion when placed in front of the upstream fan. From the derived formula of acoustic spectrum from rotor blade forces resulting from the viscous and potential wakes of the upstream counter-rotating blade row impinging in the downstream one, two obvious mechanisms for interaction noise reduction can be easily found, which are either to increase the order of the Bessel function of the first kind, or to reduce the interaction fluctuating forces which can be realized by reducing the magnitude of the wake centerline velocity deficit or broaden the wake width. Several passive methods for reducing the aerodynamic interaction noise of a newly designed small axial-flow contra-rotating fan are explored. These methods include: (1) Perforated trailing edge for the upstream rotor and perforated leading edge for the downstream rotor; (2) Slitted trailing edge serration for the upstream rotor; (3) Chordwise perforated leading edge of the downstream rotor. Up to 5-7 dB overall noise reduction at all directions is achieved through the first two methods compared under the same aerodynamic output. Only 1.3 dB of acoustic benefit is achieved by the third method, but it hardly causes any adverse impact on the aerodynamic performance. The findings are useful and helpful in designing a quiet coaxial fan (two/multiple-stage or contra-rotating) and adopting an appropriate approach for noise mitigation. Subjects: Fans (Machinery) Noise control
Author :
Publisher :
ISBN 13 :
Total Pages : 24 pages
Book Rating : 4.:/5 (317 download)
Download or read book Forward Acoustic Performance of a Model Turbofan Designed for a High Specific Flow (QF-14) written by and published by . This book was released on 1982 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : United States. National Aeronautics and Space Administration
Publisher :
ISBN 13 :
Total Pages : 826 pages
Book Rating : 4.3/5 (91 download)
Download or read book NASA Technical Paper written by United States. National Aeronautics and Space Administration and published by . This book was released on 1978 with total page 826 pages. Available in PDF, EPUB and Kindle. Book excerpt:
