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Author : George B. Matthews
Publisher :
ISBN 13 :
Total Pages : 272 pages
Book Rating : 4.X/5 (4 download)
Download or read book Wind tunnel wall effects in v/stol model testing written by George B. Matthews and published by . This book was released on 1968 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : R. E. Kuhn
Publisher :
ISBN 13 :
Total Pages : 36 pages
Book Rating : 4.:/5 (227 download)
Download or read book Tunnel-wall Effects Associated with Vtol-stol Model Testing written by R. E. Kuhn and published by . This book was released on 1959 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wind-tunnel investigations of VTOL and STOL airplane models involve configurations in which a large amount of power is being used to generate part of the lift through the medium of propeller slipstreams or jet exhausts directed downward at large angles to the free-stream direction. For many configurations the propellers or jet exhausts are arranged, for example, as in the jet flap, to cover the entire span of the wing and thus to assist the wind in its natural process of producing so-called 'circulation' lift. This arrangement results in the streamlines in the vicinity of the wing also being turned through large angles to the free-stream direction of flow. The presence of the tunnel walls, however, imposes the conditions that the streamlines at the tunnel walls must be parallel to the free stream. Thus, the problem of tunnel-wall effects in VTOL-STOL model testing is similar to that associated with conventional model testing but differs greatly in degree. Experience has shown that, in addition to these usual tunnel-wall effects, flow separation on the model can also be induced by the tunnel walls. The experiences of the Langley Research Center of N.A.S.A. related to these problems in closed-throat wind tunnels are reviewed. (Author).
Author : Marie H. Tuttle
Publisher :
ISBN 13 :
Total Pages : 60 pages
Book Rating : 4.:/5 (317 download)
Download or read book Wind Tunnel Wall Interference in V/STOL and High Lift Testing: A Selected, Annotated Bibliography written by Marie H. Tuttle and published by . This book was released on 1986 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Marie H. Tuttle
Publisher :
ISBN 13 :
Total Pages : 58 pages
Book Rating : 4.F/5 ( download)
Download or read book Wind Tunnel Wall Interference in V/STOL and High Lift Testing written by Marie H. Tuttle and published by . This book was released on 1986 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 78 pages
Book Rating : 4.:/5 (317 download)
Download or read book V/STOL Wind-tunnel Testing written by and published by . This book was released on 1984 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 86 pages
Book Rating : 4.:/5 (317 download)
Download or read book Wind-tunnel Testing of VTOL and STOL Aircraft written by and published by . This book was released on 1978 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Kalman J. Grunwald
Publisher :
ISBN 13 :
Total Pages : 122 pages
Book Rating : 4.:/5 (31 download)
Download or read book Experimental Study of Wind-tunnel Wall Effects and Wall Corrections for a General-research V/STOL Tilt-wing Model with Flap written by Kalman J. Grunwald and published by . This book was released on 1965 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Harry H. Heyson
Publisher :
ISBN 13 :
Total Pages : 236 pages
Book Rating : 4.:/5 (31 download)
Download or read book The Effect of Wind-tunnel Wall Interference on the Performance of a Fan-in-wing VTOL Model written by Harry H. Heyson and published by . This book was released on 1974 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : David H. Hickey
Publisher :
ISBN 13 :
Total Pages : 24 pages
Book Rating : 4.:/5 (177 download)
Download or read book Correlation of Wind Tunnel and Flight Test Aerodynamic Data for Five V/STOL Aircraft written by David H. Hickey and published by . This book was released on 1965 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: The five aircraft tested represent a wide variety of V/STOL concepts. Correlation between the wind-tunnel and flight-test aerodynamic results is generally good when wind-tunnel wall corrections are omitted; in some cases wall corrections are shown to degrade the correlation. The aircraft and wind-tunnel geometry are related to model-tunnel sizing parameters and a VTOL lift parameter, in order to establish tentative sizing criteria for V/STOL wind-tunnel testing with small wall effects. The report is one of the series 515-522 of papers presented at the 27th meeting of the AGARD Flight Mechanics Panel, held 11-12 October 1965 in Rome, Italy. (Author).
Author : T. W. Binion (Jr.)
Publisher :
ISBN 13 :
Total Pages : 38 pages
Book Rating : 4.3/5 (91 download)
Download or read book An Experimental Study of Several Wind Tunnel Wall Configurations Using Two V/STOL Model Configurations written by T. W. Binion (Jr.) and published by . This book was released on 1975 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : E. M. Kraft
Publisher :
ISBN 13 :
Total Pages : 74 pages
Book Rating : 4.3/5 (91 download)
Download or read book Analytical Study of Ventilated Wind Tunnel Boundary Interference on V/STOL Models Including Wake Curvature and Decay Effects written by E. M. Kraft and published by . This book was released on 1974 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt: The wind tunnel boundary interference on a V/STOL model is calculated in a rectangular test section with solid vertical walls and ventilated (perforated or slotted) horizontal walls. The interference is found by applying the small perturbation theory of an incompressible fluid to the boundary value problem. The theory uses an image method in addition to Fourier transforms with an equivalent homogeneous boundary condition on the ventilated wall. The mathematical representation of the V/STOL model accounts for the curvature and decay of the wake. The assumption of a constant wake strength produces a paradox in that the maximum value of the interference factors increases as the initial jet velocity decreases. The most significant aspect of the analysis shows that nonlinear cross-flow effects at the tunnel boundary are important in the V/STOL case, and a quasi-linear approximation to these effects is introduced into the solution providing good agreement with experimental data.
Author : Edwin E. Davenport
Publisher :
ISBN 13 :
Total Pages : 112 pages
Book Rating : 4.:/5 (31 download)
Download or read book Wind-tunnel-wall Effects and Scale Effects on a VTOL Configuration with a Fan Mounted in the Fuselage written by Edwin E. Davenport and published by . This book was released on 1965 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : William H Rae (Jr)
Publisher :
ISBN 13 :
Total Pages : 37 pages
Book Rating : 4.:/5 (227 download)
Download or read book An Experimental Investigation of Wind Tunnel Wall Corrections and Test Limits for V/STOL Vehicles written by William H Rae (Jr) and published by . This book was released on 1973 with total page 37 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report deals with an experimental investigation of some of the problems associated with wind tunnel testing of V/STOL type aircraft. The models used in the study were either rotors or propellers acting as a rotor. Various size and shape wind tunnel test sections were simulated by the use of inserts installed within a larger main wind tunnel test section. The study investigated the application of wind tunnel wall corrections to models with large values of downwash. A physical limit, called flow breakdown, to the size and allowable downwash for a given model-tunnel combination was also studied. (Modified author abstract).
Author : Jewel B. Barlow
Publisher : John Wiley & Sons
ISBN 13 : 0471557749
Total Pages : 738 pages
Book Rating : 4.4/5 (715 download)
Download or read book Low-Speed Wind Tunnel Testing written by Jewel B. Barlow and published by John Wiley & Sons. This book was released on 1999-02-22 with total page 738 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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 : Travis W. Binion
Publisher :
ISBN 13 :
Total Pages : 72 pages
Book Rating : 4.3/5 (91 download)
Download or read book An Investigation of Several Slotted Wind Tunnel Wall Configurations with a High Disk Loading V/STOL Model written by Travis W. Binion and published by . This book was released on 1971 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: The investigation reported herein is the experimental portion of a unified theoretical and experimental search for a slotted wind tunnel wall configuration with minimal interference for conventional and V/STOL models. It is shown that theory and experiment are in excellent agreement for the classical case provided an appropriate expression is used to relate the wall geometry to the boundary condition. Classical data correction equations are not appropriate for the V/STOL case, however. An additional term, not predicted by theory, is needed to account for changes in the jet wake. Geometric parameters which influence the wall interference quantities are indicated. Wall configurations are shown which will produce interference-free force data to a jet-to-free-stream velocity ratio of 4.5. (Author).
Author : W. R. Sears
Publisher :
ISBN 13 :
Total Pages : 184 pages
Book Rating : 4.:/5 (227 download)
Download or read book Experiments in an Adaptable-Wall Wind Tunnel for V/STOL Testing written by W. R. Sears and published by . This book was released on 1986 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experiments were carried out, over a period of two years, in an Adaptable-Wall wind tunnel configured for testing of airplane models at very large lift. The program was intended especially to demonstrate Proof of Concept for this type of wind tunnel, in which the simulated stream vector is inclined appreciably to the tunnel axis. The measured inner flow is matched to the computed, updated outer flow by an iterative process. Wall-adaptation controls in this tunnel are vaned panels in the floor and ceiling of the working section and a variable-angle inlet nozzle. Velocity components are measured by a Laser-Doppler system using a fixed laser and movable optical components. The test model used in these experiments was a high-wing V/STOL configuration having full-span wing flaps with lower-surface blowing of their inboard portions. In all of the experiments reported here, the combination of angle of attack, flap setting, and flap blowing was such as to produce large flow deflection and severe wall interference in a conventional tunnel. The model configuration was always laterally symmetrical, and most runs were made under the assumption of symmetrical flow. The iterative procedure, based on measured control matrices, typically led to minimum matching-discrepancies (root-mean-square values) of about three percent of stream speed after about six iterations. It is estimated that this reflects residual errors at the model of about one percent of stream speed. It is concluded that these results constitute successful Proof of Concept. Suggestions are made regarding the directions of further development of this type of wind tunnel. (Author).
Author : Ray H. Wright
Publisher :
ISBN 13 :
Total Pages : 92 pages
Book Rating : 4.:/5 (31 download)
Download or read book Test Sections for Small Theoretical Wind-tunnel-boundary Interference on V/STOL Models written by Ray H. Wright and published by . This book was released on 1968 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: A wind-tunnel test section with closed upper wall, slotted side walls, and open lower boundary was found theoretically to produce zero tunnel-boundary lift interference on a small wing with horizontal wake mounted at the center of the test section. For this test section the variation of the interference with angle of the vortex wake behind a high-lift-coefficient model was not large. Because of the small slot widths required for zero interference and of the effects of boundary layer, the theory is regarded as unreliable for predicting the slot widths required; however, the variation of the interference with the slot width for widths somewhat greater than those needed for zero interference was found to be small. The interference in the region likely to be occupied by the tall of a model was investigated in some detail and was found to change with slot width and with wake angle more strongly than did the interference at the lifting element. A limited investigation of the lift interference in a test section with closed upper wall and slotted side and lower boundaries was made to obtain the theoretically indicated slot width required for zero lift interference at a center-mounted wing with the wake horizontal.
