Design and Construction of a Velocity Control System for a Low Turbulence, Vertical Wind Tunnel

Design and Construction of a Velocity Control System for a Low Turbulence, Vertical Wind Tunnel
Author: Lawrence Vehslage Field
Publisher:
Total Pages: 96
Release: 1970
Genre: Turbomachines
ISBN:

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"A low velocity (0 - 11m/sec), low turbulence vertical atmospheric wind tunnel has been designed and built by Inca Engineering Company of San Gabriel, California. This tunnel was assembled in the Cloud Physics Research Center at UMR. The tunnel is designed to aid in the study of phenomena associated with water drops suspended in a vertical air stream. This thesis describes the design and construction of the velocity control system for this tunnel. Constant speed, centrifugal fans are used to draw air through the tunnel. To allow these fans to operate at a constant efficiency, a valve system is used to provide a constant flow rate to the fans, while controlling the flow rate drawn through the tunnel. This system consists of a valve box with two inlets, one drawing air through the tunnel and the other drawing air from the room, and a sliding carriage, or pintle, with parabolic ends. The pintle is used to vary the areas of each inlet, but maintain a constant total inlet area. The valve system also includes equipment to change the pintle position, thus changing the areas of each inlet, and equipment to give an indication of the pintle position. Preliminary testing of the wind tunnel and velocity control equipment included a determination of the relationship between tunnel test section velocity and pintle position, a determination of velocity profiles in the test section, and a determination of the level of turbulence intensity in the test section"--Abstract, leaf ii.

Wind Tunnel Test Techniques

Wind Tunnel Test Techniques
Author: Colin Britcher
Publisher: Academic Press
Total Pages: 672
Release: 2023-10-20
Genre: Technology & Engineering
ISBN: 0128181001

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Wind Tunnel Test Techniques: Design and Use at Low and High Speeds with Statistical Engineering Applications provides an up-to-date treatment of the topic. Beginning with a brief history of wind tunnels and its types and uses, the book goes on to cover subsonic, supersonic and hypersonic wind tunnel design and construction, calibration, boundary corrections, flow quality assessment, pressure surveys, and dynamic testing. It also focuses on wind tunnel facilities, making it useful for both the designer and operator. Engineers and graduate students in aerospace, automotive and similar programs will find this book useful in their work with experimental aerodynamics, gas dynamics, facility design and performance. Deals with a broad range of flow speeds in wind tunnels, from low speed to high speed Provides a discussion of similarity laws as well as material on statistical analysis Includes coverage on facility-to-facility and facility-to-CFD correlation Presents advanced topics such as cryogenic wind tunnels, ground simulation in automotive testing, and propulsion testing

Modeling the Benchmark Active Control Technology Wind-tunnel Model for Active Control Design Applications

Modeling the Benchmark Active Control Technology Wind-tunnel Model for Active Control Design Applications
Author: Martin R. Waszak
Publisher:
Total Pages: 34
Release: 1998
Genre: Aeroelasticity
ISBN:

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This report describes the formulation of a model of the dynamic behavior of the Benchmark Active Controls Technology (BACT) wind tunnel for active control design and analysis applications. The model is formed by combining the equations of motion for the BACT wind tunnel model with actuator models and a model of wind tunnel turbulence. The primary focus of this report is the development of the equations of motion from first principles by using Lagrange's equations and the principle of virtual work. A numerical form of the model is generated by making use of parameters obtained from both experiment and analysis. Comparisons between experimental and analytical data obtained from the numerical model show excellent agreement and suggest that simple coefficient-based aerodynamics are sufficient to accurately characterize the aeroelastic response of the BACT wind tunnel model. The equations of motion developed herein have been used to aid in the design and analysis of a number of flutter suppresion controllers that have been successfully implemented.

Low-Speed Wind Tunnel Testing

Low-Speed Wind Tunnel Testing
Author: Jewel B. Barlow
Publisher: John Wiley & Sons
Total Pages: 738
Release: 1999-02-22
Genre: Technology & Engineering
ISBN: 0471557749

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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.

Wind Tunnel Designs and Their Diverse Engineering Applications

Wind Tunnel Designs and Their Diverse Engineering Applications
Author: Noor Ahmed
Publisher: BoD – Books on Demand
Total Pages: 232
Release: 2013-03-06
Genre: Science
ISBN: 9535110470

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This book is intended to be a valuable addition to students, engineers, scientists, industrialists, consultants and others providing greater insight into wind tunnel designs and their enormous research potential. It is a compilation of works from world experts on subsonic and supersonic wind tunnel designs, applicable to a diverse range of disciplines. The book is organised in two sections. The first section comprises of three chapters on various aspects of stationary and portable subsonic wind tunnel designs, followed by one chapter on supersonic wind tunnel and the final chapter discusses a method to address unsteadiness effects of fan blade rotation. The second section contains four chapters regarding wind tunnel applications across a multitude of engineering fields including civil, mechanical, chemical and environmental engineering.