Download or read book Study of Multipiece Flow Through Wind Tunnel Models for HIRT written by W. K. Alexander and published by . This book was released on 1975 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt: The usefulness of the proposed High Reynolds Number Transonic Wind Tunnel (HIRT) of AEDC will be largely influenced by the restrictions placed on testing due to model limitations. A preliminary study of models determined that basic models (without internal airflow) could be designed and tested in HIRT with few restrictions. The present study contains a more detailed analysis of the limitations of a high-performance fighter aircraft model, with variables similar to those for present-day transonic wind tunnels. A typical test plan is outlined, and model, balance, and support system limitations are presented.
Download or read book Wind Tunnel Model Parametric Study for Use in the Proposed 8 Ft X 10 Ft High Reynolds Number Transonic Wind Tunnel HIRT at Arnold Engineering Development Center written by Walter K. Alexander and published by . This book was released on 1973 with total page 197 pages. Available in PDF, EPUB and Kindle. Book excerpt: The need for a high Reynolds number transonic wind tunnel (HIRT) has been recognized throughout the industry for some years. The proposed HIRT facility at Arnold Engineering Development Center will provide a much needed tool for the study of phenomena sensitive to Reynolds number. The usefulness of the HIRT facility will be largely influenced by the ability of industry to design and build wind-tunnel models for an acceptable cost capable of operating within the severe environment of the tunnel. The object of this study is to determine the feasibility of designing and building models capable of withstanding the loads and environmental conditions of the facility. The aircraft configurations chosen for study cover a wide spectrum of flight conditions. (Modified author abstract).
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1976 with total page 1072 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Wind Tunnels and Experimental Fluid Dynamics Research written by Jorge Colman Lerner and published by BoD – Books on Demand. This book was released on 2011-07-27 with total page 728 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book AGARD Advisory Report written by North Atlantic Treaty Organization. Advisory Group for Aeronautical Research and Development and published by . This book was released on 1977 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Study of the Simulation of Flow with Free stream Mach Number 1 in a Choked Wind Tunnel written by John R. Spreiter and published by . This book was released on 1960 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: Summary: The degree to which experimental results obtained under choking conditions in a wind tunnel with solid walls simulate those associated with an unbounded flow with free-stream Mach number 1 is investigated for the cases of two-dimensional and axisymmetric flows. It is found that a close resemblance does indeed exist in the vicinity of the body, and that the results obtained in this way are generally at least as accurate as those obtained in a transonic wind tunnel with partly open test section. Some of the results indicate, however, that substantial interference effects, particularly those of the wave reflection type, may be encountered under certain conditions, both in choked wind tunnels and in transonic wind tunnels, and that the reduction of these interference effects to acceptable limits may require the use of models of unusually small size.
Download or read book A Theoretical and Experimental Study of Unsteady Flow Processes in a Ludwieg Tube Wind Tunnel written by John D. Warmbrod and published by . This book was released on 1969 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: Theoretical and experimental study of unsteady flow processes in Ludwieg tube wind tunnels.
Download or read book Wind Tunnel Test Techniques written by Colin Britcher and published by Academic Press. This book was released on 2023-10-20 with total page 672 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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
Download or read book Models for Wind Tunnel Tests Based on Additive Manufacturing Technology written by Weijun Zhu and published by Springer Nature. This book was released on 2024-01-15 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book systematically introduces design and fabrication of physical models for wind tunnel tests based on additive manufacturing technology, including model design technology, model fabrication process, strengthening technology, etc. On this basis, it introduces in detail the specific implementation process of commonly used models, e.g., force measurement models, pressure measurement models, elastic models, and flutter models. This book mainly provides references for researchers and engineers who are engaged in aircraft design, experimental fluid mechanics, and additive manufacturing technology research.
Download or read book Wind Tunnels written by Satoru Okamoto and published by BoD – Books on Demand. This book was released on 2011-02-10 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt: Although great advances in computational methods have been made in recent years, wind tunnel tests remain essential for obtaining the full range of data required to guide detailed design decisions for various practical engineering problems. This book collects original and innovative research studies on recent applications in wind tunnel tests, exhibiting various investigation directions and providing a bird’s eye view on this broad subject area. It is composed of seven chapters that have been grouped in two major parts. The first part of the book (chapters 1–4) deals with wind tunnel technologies and devices. The second part (chapters 5–7) deals with the latest applications of wind tunnel testing. The text is addressed not only to researchers but also to professional engineers, engineering lecturers, and students seeking to gain better understanding of the current status of wind tunnels. Through its seven chapters, the reader will have an access to a wide range of works related to wind tunnel testing.
Download or read book On Improvement of Air Flow in Wind Tunnels written by C. Wieselsberger and published by . This book was released on 1928 with total page 594 pages. Available in PDF, EPUB and Kindle. Book excerpt: The most important aerodynamical qualities that should be aimed at in wind tunnel design, are as follows: 1) constant and parallel direction of flow; 2) uniform velocity across all sections; 3) absence of turbulent motion; 4) constant velocity of flow. The above-mentioned qualities are all realized in a high degree in the Gottingen type of wind tunnel, with a parallel portion before the working section, the cross section of which is steadily reduced. It is shown in what follows, that the system can be applied to other wind tunnels, such as the N.P.L. or Eiffel type.
Download or read book Experimental Wind Tunnel Study of Air Flow Past a Model of Mountain Terrain written by V. K. Lokhin and published by . This book was released on 1971 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: The problem of wind tunnel study of the pattern of air stream flow past a model of mountain terrain for one area in which an industrial complex is being designed. Theoretical justification for using the modeling method and the method of model scale selection is set forth. These results were compared with full-scale photographs and satisfactory agreement between these data was found. Results of experimental studies made it possible to establish snow accumulation zones where placement of snow-protective structures is required. (Author).
Download or read book Advisory Report written by North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development and published by . This book was released on 1975 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Aeronautical Engineering written by and published by . This book was released on 1977 with total page 524 pages. Available in PDF, EPUB and Kindle. Book excerpt: A selection of annotated references to unclassified reports and journal articles that were introduced into the NASA scientific and technical information system and announced in Scientific and technical aerospace reports (STAR) and International aerospace abstracts (IAA).
Download or read book Assessment of a Flow Through Balance for Hypersonic Wind Tunnel Models with Scramjet Exhaust Flow Simulation written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-08 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this investigation were twofold: first, to determine whether accurate force and moment data could be obtained during hypersonic wind tunnel tests of a model with a scramjet exhaust flow simulation that uses a representative nonwatercooled, flow-through balance; second, to analyze temperature time histories on various parts of the balance to address thermal effects on force and moment data. The tests were conducted in the NASA Langley Research Center 20-Inch Mach 6 Wind Tunnel at free-stream Reynolds numbers ranging from 0.5 to 7.4 x 10(exp 6)/ft and nominal angles of attack of -3.5 deg, 0 deg, and 5 deg. The simulant exhaust gases were cold air, hot air, and a mixture of 50 percent Argon and 50 percent Freon by volume, which reached stagnation temperatures within the balance of 111, 214, and 283 F, respectively. All force and moment values were unaffected by the balance thermal response from exhaust gas simulation and external aerodynamic heating except for axial-force measurements, which were significantly affected by balance heating. This investigation showed that for this model at the conditions tested, a nonwatercooled, flow-through balance is not suitable for axial-force measurements during scramjet exhaust flow simulation tests at hypersonic speeds. In general, heated exhaust gas may produce unacceptable force and moment uncertainties when used with thermally sensitive balances. Huebner, Lawrence D. and Kniskern, Marc W. and Monta, William J. Langley Research Center...
Download or read book A Numerical Study of the Effects of Wind Tunnel Wall Proximity on an Airfoil Model written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-02 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt: A procedure was developed for modeling wind tunnel flows using computational fluid dynamics. Using this method, a numerical study was undertaken to explore the effects of solid wind tunnel wall proximity and Reynolds number on a two-dimensional airfoil model at low speed. Wind tunnel walls are located at varying wind tunnel height to airfoil chord ratios and the results are compared with freestream flow in the absence of wind tunnel walls. Discrepancies between the constrained and unconstrained flows can be attributed to the presence of the walls. Results are for a Mach Number of 0.25 at angles of attack through stall. A typical wind tunnel Reynolds number of 1,200,000 and full-scale flight Reynolds number of 6,000,000 were investigated. At this low Mach number, wind tunnel wall corrections to Mach number and angle of attack are supported. Reynolds number effects are seen to be a consideration in wind tunnel testing and wall interference correction methods. An unstructured grid Navier-Stokes code is used with a Baldwin-Lomax turbulence model. The numerical method is described since unstructured flow solvers present several difficulties and fundamental differences from structured grid codes, especially in the area of turbulence modeling and grid generation. Potsdam, Mark and Roberts, Leonard Unspecified Center...
Download or read book Assessment of a Flow through Balance for Hypersonic Wind Tunnel Models with Scramjet Exhaust Flow Simulation written by Lawrence D. Huebner and published by . This book was released on 1993 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt:
