Wall Interference In Wind Tunnels With Slotted And Porous Boundaries At Subsonic Speeds
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Wall Interference In Wind Tunnels With Slotted And Porous Boundaries At Subsonic Speeds
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Author : Barrett Stone Baldwin
language : en
Publisher:
Release Date : 1953
Wall Interference In Wind Tunnels With Slotted And Porous Boundaries At Subsonic Speeds written by Barrett Stone Baldwin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1953 with Aeronautics categories.
Linearized compressible-flow analysis is applied to the study of wind-tunnel-wall interference for subsonic flow in either two-dimensional or circular test sections having slotted or porous walls. Expressions are developed for evaluating blockage and lift interference.
A Numerical Method Of Calculating The Boundary Induced Interference In Slotted Of Perforated Wind Tunnels Of Rectangular Cross Section
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Author : James D. Keller
language : en
Publisher:
Release Date : 1971
A Numerical Method Of Calculating The Boundary Induced Interference In Slotted Of Perforated Wind Tunnels Of Rectangular Cross Section written by James D. Keller and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1971 with Boundary layer categories.
A numerical method is presented for calculating the boundary-induced interference at subsonic speeds in wind tunnels of rectangular cross section with slotted or perforated walls. The slot width or wall porosity can vary throughout the test section. The interference can be computed at any point in the test section. The model can be any configuration and can be located anywhere in the test section. Several examples are given, and comparison is made with other methods were available.
High Speed Problems Of Aircraft And Experimental Methods
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Author : Allen F. Donovan
language : en
Publisher: Princeton University Press
Release Date : 2015-12-08
High Speed Problems Of Aircraft And Experimental Methods written by Allen F. Donovan and has been published by Princeton University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-12-08 with Science categories.
Volume VIII of the High Speed Aerodynamics and Jet Propulsion series. This volume includes: performance calculation at high speed; stability and control of high speed aircraft; aeroelasticity and flutter; model testing; transonic wind tunnels; supersonic tunnels; hypersonic experimental facilities; low density wind tunnels; shock tube; wind tunnel measurements; instrumented models in free flight; piloted aircraft testing; free flight range methods. Originally published in 1961. The Princeton Legacy Library uses the latest print-on-demand technology to again make available previously out-of-print books from the distinguished backlist of Princeton University Press. These editions preserve the original texts of these important books while presenting them in durable paperback and hardcover editions. The goal of the Princeton Legacy Library is to vastly increase access to the rich scholarly heritage found in the thousands of books published by Princeton University Press since its founding in 1905.
An Investigation Of Several Slotted Wind Tunnel Wall Configurations With A High Disk Loading V Stol Model
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Author : Travis W. Binion
language : en
Publisher:
Release Date : 1971
An Investigation Of Several Slotted Wind Tunnel Wall Configurations With A High Disk Loading V Stol Model written by Travis W. Binion and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1971 with Short take-off and landing aircraft categories.
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).
Experimental Studies Of Transonic Flow Field Near A Longitudinally Slotted Wind Tunnel Wall
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Author : Joel L. Everhart
language : en
Publisher:
Release Date : 1994
Experimental Studies Of Transonic Flow Field Near A Longitudinally Slotted Wind Tunnel Wall written by Joel L. Everhart and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with categories.
Approximation Of The Spanwise Distribution Of Wind Tunnel Boundary Interference On Lift Of Wings In Rectangular Perforated Wall Test Sections
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Author : Ray H. Wright
language : en
Publisher:
Release Date : 1968
Approximation Of The Spanwise Distribution Of Wind Tunnel Boundary Interference On Lift Of Wings In Rectangular Perforated Wall Test Sections written by Ray H. Wright and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1968 with Airplanes categories.
An approximation method has been developed for calculating the spanwise distribution of wind-tunnel-boundary upwash interference on lift of wings in rectangular perforated-wall test sections. This method is applied to square test sections with an assumed effective permeability constant of 0.6. A problem of considerable difficulty in practical application of the method presented is the estimation of an effective permeability constant. Because of the variation of the upwash interference with Mach number and of the influence of boundary layer on the effective permeability factor, the boundary interference in a perforated-wall wind-tunnel test section at high subsonic Mach numbers is likely to be of the nature of that in an open-throat tunnel.
Analytical Study Of Ventilated Wind Tunnel Boundary Interference On V Stol Models Including Wake Curvature And Decay Effects
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Author : E. M. Kraft
language : en
Publisher:
Release Date : 1974
Analytical Study Of Ventilated Wind Tunnel Boundary Interference On V Stol Models Including Wake Curvature And Decay Effects written by E. M. Kraft and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1974 with Short take-off and landing aircraft categories.
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.
Engineer In Charge
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Author : James R. Hansen
language : en
Publisher:
Release Date : 1987
Engineer In Charge written by James R. Hansen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with Technology & Engineering categories.
Technical Note National Advisory Committee For Aeronautics
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Author : United States. National Advisory Committee for Aeronautics
language : en
Publisher:
Release Date : 1958
Technical Note National Advisory Committee For Aeronautics written by United States. National Advisory Committee for Aeronautics and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1958 with Aeronautics categories.
An Integral Equation Method For Boundary Interference In A Perforated Wall Wind Tunnel At Transonic Speeds
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Author : E. M. Kraft
language : en
Publisher:
Release Date : 1976
An Integral Equation Method For Boundary Interference In A Perforated Wall Wind Tunnel At Transonic Speeds written by E. M. Kraft and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1976 with Aerodynamics, Transonic categories.
The wind tunnel boundary interference at transonic speeds on a thin airfoil in a two-dimensional perforated-wall wind tunnel was determined. The interference was found by applying an integral equation method to the nonlinear transonic small disturbance equation including embedded supersonic regions with shock waves. The kernels of the ensuing integral equation were replaced by series approximations, and the integrals were evaluated in closed form. The iterative technique used to calculate the interference from the integral equation method is shown to converge rapidly, and the computing time for the integral equation method is typically an order of magnitude less than present numerical methods. As a special case, the integral equation method for a thin airfoil in free air was also examined. It was found that the introduction of a novel influence function yields, for the first time, a self-contained integral equation for a lifting airfoil. In addition, a systematic study of the classical assumption used to simplify the integral equation shows that the integral method can provide solutions in good agreement with results from the numerical methods.