An Investigation of Several Slotted Wind Tunnel Wall Configurations with a High Disk Loading V/STOL Model
An Investigation of Several Slotted Wind Tunnel Wall Configurations with a High Disk Loading V/STOL Model

Author: Travis W. Binion

Publisher:

Published: 1971

Total Pages: 72

ISBN-13:

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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).

An Investigation of Several Slotted Wind Tunnel Wall Configurations with a High Disk Loading V/STOL Model
An Investigation of Several Slotted Wind Tunnel Wall Configurations with a High Disk Loading V/STOL Model

Author: Travis W. Binion

Publisher:

Published: 1971

Total Pages: 0

ISBN-13:

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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).

An Investigation of Several Slotted Wind Tunnel Wall Configurations with a High Disc Loading V/STOL Model
An Investigation of Several Slotted Wind Tunnel Wall Configurations with a High Disc Loading V/STOL Model

Author: T. W Binion (Jr)

Publisher:

Published: 1971

Total Pages: 65

ISBN-13:

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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).

Analytical Study of Ventilated Wind Tunnel Boundary Interference on V/STOL Models Including Wake Curvature and Decay Effects
Analytical Study of Ventilated Wind Tunnel Boundary Interference on V/STOL Models Including Wake Curvature and Decay Effects

Author: E. M. Kraft

Publisher:

Published: 1974

Total Pages: 74

ISBN-13:

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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.

Calculation of Interference for a Porous Wall Wind Tunnel by the Method of Block Cyclic Reduction
Calculation of Interference for a Porous Wall Wind Tunnel by the Method of Block Cyclic Reduction

Author: C. F. Lo

Publisher:

Published: 1975

Total Pages: 46

ISBN-13:

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The lift interference was calculated for a porous wall wind tunnel by a modified method of block cyclic reduction. This efficient, numerical method has indicated its accuracy by comparison with other available analytical and approximate solutions. A scheme is introduced to search for optimum wall configurations. The lift interference computed for an NACA 64-series finite airfoil in some optimum configurations has demonstrated the achievement of minimization of interference. The effect of test section length is also examined. (Author).

Scientific and Technical Aerospace Reports
Scientific and Technical Aerospace Reports

Author:

Publisher:

Published: 1991

Total Pages: 1460

ISBN-13:

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