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.

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.

Download or read book Design Performance and Analysis of Ducted Axial Flow Fans written by Raymond Allan Wallis and published by . This book was released on 1953 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

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.

Download or read book The Design of a Reversible Fan written by Ellis Millard Killgore and published by . This book was released on 1957 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Design and Performance of a High pressure Axial flow Fan written by Lionel S. Marks and published by . This book was released on 1935 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

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:

Download or read book The Performance of an Axial flow Fan Designed by Computer written by J. E. Hesselgreaves and published by . This book was released on 1970 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Fans written by Thomas Carolus and published by Springer Nature. This book was released on 2023-01-13 with total page 263 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.

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

Download or read book The Theory and Performance of Axial flow Fans written by Curt Keller and published by . This book was released on 1937 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Papers Presented at the International Conference on Fan Design Applications written by Herbert Simon Stephens and published by . This book was released on 1982 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Theory and Performance of Axial flow Fans Adapted for the Use of Fan Designers by Lionel S Marks written by C. Keller and published by . This book was released on 1937 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 892 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Performance of a Highly Loaded Two stage Axial flow Fan written by Robert S. Ruggeri and published by . This book was released on 1974 with total page 199 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Aerodynamic Performance of Axial flow Fan Stage Operated at Nine Inlet Guide Vane Angles written by Royce D. Moore and published by . This book was released on 1979 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1971 with total page 776 pages. Available in PDF, EPUB and Kindle. Book excerpt: