Download or read book Analytical Study of Ventilated Wind Tunnel Boundary Interference on V STOL Models Including Wake Curvature and Decay Effects written by and published by . This book was released on 1974 with total page 0 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.

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:

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:

Download or read book NASA Technical Memorandum written by and published by . This book was released on 1986 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Monthly Catalog of United States Government Publications written by and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Theoretical Study of Conditions Limiting V STOL Testing in Wind Tunnels with Solid Floor written by Harry H. Heyson and published by . This book was released on 1970 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt: Under sufficiently large wake deflections, the forward portion of the wake is found to flow forward along the floor leading to a vortex pattern which results in Rae's limits (Journal of Aircraft, May-June 1967). Although wind-tunnel data cannot normally be corrected successfully beyond these limits, it may be possible to obtain ground-effect data for conditions more severe than those implied by Rae.

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:

Download or read book Wind Tunnel Boundary Interference on a V STOL Model written by Ching-Fang Lo and published by . This book was released on 1970 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Calculated Wind tunnel boundary Lift interference Factors for Rectangular Perforated Test Sections written by Benferd L. Schilling and published by . This book was released on 1970 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Monthly Catalog of United States Government Publications Cumulative Index written by United States. Superintendent of Documents and published by . This book was released on 1979 with total page 1504 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Monthly Catalog of United States Government Publications written by United States. Superintendent of Documents and published by . This book was released on 1966 with total page 1464 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book 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 published by . This book was released on 1968 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

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:

Download or read book Approximate Treatment of V STOL Wall Interference for Closed Circular Tunnels written by Harry H. Heyson and published by . This book was released on 1971 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: An approximate treatment of V/STOL wall interference in a circular tunnel indicates that the interference factors at the model for this tunnel should be of the same order of magnitude as those presently available for a square tunnel of equal cross-sectional area. There is a greater degree of uncertainty with respect to the lateral and longitudinal distributions of interference; however, the available results for the square tunnel should be reasonably close to those of the circular tunnel provided that the model is relatively small in comparison with the test section.

Download or read book 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 published by . This book was released on 1971 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Theoretical Study of the Use of Variable Geometry in the Design of Minimal correction V STOL Wind Tunnels written by Harry H. Heyson and published by . This book was released on 1969 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: Theoretical study indicates that, if either the width-height ratio or the model height is properly scheduled, the vertical interference velocities at the lifting system can be reduced to zero in closed-on-bottom-only tunnels. Reductions in interference at the tail, nonuniformity of interference, and minimum speed for recirculation-free testing can be obtained simultaneously; however, these reductions are much greater in the case of variable width-height ratio. Variable width-height-ratio operation of a closed tunnel can reduce the interference at the lifting system by a factor of 2 or 3. This configuration, at low speeds, can reduce interference at the tail, nonuniformity of interference, and minimum speed for recirculation-free testing to almost negligible values.

Download or read book Wall Interference in Wind Tunnels with Slotted and Porous Boundaries at Subsonic Speeds written by Barrett Stone Baldwin and published by . This book was released on 1953 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.