Generation of Wind Tunnel Flow PDF Download
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Author: V. Kr Shárán
Publisher:
ISBN: 9789516660304
Category : Wind tunnels
Languages : en
Pages : 28
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Book Description
Author: V. Kr Shárán
Publisher:
ISBN: 9789516660304
Category : Wind tunnels
Languages : en
Pages : 28
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Book Description
Author: Donald D. Baals
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 218
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Book Description
Author: R. L. Parker (Jr.)
Publisher:
ISBN:
Category : Porosity
Languages : en
Pages : 52
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Book Description
Author: Noah Aidan Conrad
Publisher:
ISBN:
Category : Computational fluid dynamics
Languages : en
Pages : 168
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Book Description
A mathematical/numerical investigation was carried out of the flow characteristics of wind tunnel test section flow influenced by a gust generation system. The University of Washington's 3'x3' Low-Speed wind tunnel was modeled using high-fidelity Computational Fluid Dynamics (CFD) simulations and using easy-to-program and inexpensive-to-run vortex lattice methods (VLM). Steady and unsteady CFD flow simulations were completed to study the nature of the flow field created by the gust generator in the wind tunnel. The gust generator induced gust angle-of-attack and the velocity of the flow field at various locations in the test section were determined and the aerodynamic effect on a test wing was also studied. In the time marching vortex lattice method developed, accounting for the effect of the walls of the wind tunnel on the forces felt by the test object was done via a system of mirror images. The VLM simulations were compared to classical Theodorsen solutions and to the CFD simulations to gauge the accuracy of the VLM simulations. In the presence of wind tunnel walls, the VLM simulations overestimated the forces felt by the test object when compared to the force predictions of the CFD simulations, but overall captured the time behavior well. Knowing the magnitude of difference between CFD and VLM results, VLM simulations can still be a useful tools, fast and inexpensive, for the design of wind tunnel gust generation systems and the positioning of wind tunnel models relative to them.
Author: L. C. Garby
Publisher:
ISBN:
Category : Aerofoils
Languages : en
Pages : 56
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Book Description
Author: Jewel B. Barlow
Publisher: John Wiley & Sons
ISBN: 0471557749
Category : Technology & Engineering
Languages : en
Pages : 738
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Book Description
A brand-new edition of the classic guide on low-speed wind tunnel testing While great advances in theoretical and computational methods have been made in recent years, low-speed wind tunnel testing remains essential for obtaining the full range of data needed to guide detailed design decisions for many practical engineering problems. This long-awaited Third Edition of William H. Rae, Jr.'s landmark reference brings together essential information on all aspects of low-speed wind tunnel design, analysis, testing, and instrumentation in one easy-to-use resource. Written by authors who are among the most respected wind tunnel engineers in the world, this edition has been updated to address current topics and applications, and includes coverage of digital electronics, new instrumentation, video and photographic methods, pressure-sensitive paint, and liquid crystal-based measurement methods. The book is organized for quick access to topics of interest, and examines basic test techniques and objectives of modeling and testing aircraft designs in low-speed wind tunnels, as well as applications to fluid motion analysis, automobiles, marine vessels, buildings, bridges, and other structures subject to wind loading. Supplemented with real-world examples throughout, Low-Speed Wind Tunnel Testing, Third Edition is an indispensable resource for aerospace engineering students and professionals, engineers and researchers in the automotive industries, wind tunnel designers, architects, and others who need to get the most from low-speed wind tunnel technology and experiments in their work.
Author: Jorge Colman Lerner
Publisher: BoD – Books on Demand
ISBN: 9533076232
Category : Science
Languages : en
Pages : 728
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Book Description
The book "Wind Tunnels and Experimental Fluid Dynamics Research" is comprised of 33 chapters divided in five sections. The first 12 chapters discuss wind tunnel facilities and experiments in incompressible flow, while the next seven chapters deal with building dynamics, flow control and fluid mechanics. Third section of the book is dedicated to chapters discussing aerodynamic field measurements and real full scale analysis (chapters 20-22). Chapters in the last two sections deal with turbulent structure analysis (chapters 23-25) and wind tunnels in compressible flow (chapters 26-33). Contributions from a large number of international experts make this publication a highly valuable resource in wind tunnels and fluid dynamics field of research.
Author: George M. Stokes
Publisher:
ISBN:
Category : Boundary layer
Languages : en
Pages : 60
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Book Description
Author: M. O. Varner
Publisher:
ISBN:
Category : Boundary layer noise
Languages : en
Pages : 44
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Book Description
In an attempt to determine the parameters characterizing the noise environment in transonic tunnels, noise-generating mechanisms for porous-wall tunnels with 60-deg inclined holes were isolated and studied. The noise environment in the test section is separated into three distinct parts: the noise due to jet flow through the porous walls, a wall hole-tunnel resonance phenomena, and the turbulent boundary layer on the test section walls and in the diffuser. Each part is analyzed separately for the effects of aerodynamic and geometric flow constraints on the frequency and power characteristics. The contribution of each of the acoustic models to the test section free-stream fluctuating pressure level is also examined.
Author: H. W. Teunissen
Publisher:
ISBN:
Category : Air jets
Languages : en
Pages : 34
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Book Description
A new concept for creating turbulence in a wind tunnel was investigated. This concept involves the use of an array of jets to drive an open-circuit wind tunnel on the ejector principle, with the turbulence being created by the shear resulting from the difference in the velocities of the primary air and the entrained flow. A scale model tunnel was constructed, and the flow velocities obtained in it were compared with the predictions of simple ejector theory. Through the control of the velocities of the individual jets in the array, both uniform and shear flows were created, and the turbulence produced in each type of flow was studied. The concept was found to be a successful one, in that useful turbulence can be produced in both the uniform and shear flows. A fairly large range of both scales and intensities of turbulence was achieved. In addition, the results show that flow profiles in a tunnel of this type could be tailored to simulate those of any portion of a boundary layer through the control of the individual jet velocities. The effectiveness of a variable-angle diffuser at the downstream end of the tunnel in controlling mean flow velocities and turbulence characteristics was also investigated. (Author).
