Analysis of Post-support and Wind-tunnel Wall Interference on Flow Field about Subsonic High-lift High-speed Research Configuration

Analysis of Post-support and Wind-tunnel Wall Interference on Flow Field about Subsonic High-lift High-speed Research Configuration PDF

Author: Wendy B. Lessard

Publisher:

Published: 2000

Total Pages: 48

ISBN-13:

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The present study was performed to determine how significant the interference effects of the wind-tunnel model support system and tunnel walls can be for a high-speed configuration during takeoff and landing conditions. A 5-percent scale model of the Technology Concept Airplane was recently tested in the Langley 14- by 22-Foot Subsonic Tunnel. The model was numerically modeled with and without the support and tunnel walls and compared with experimental data. Detailed analysis of the flow provided additional insight concerning what effects the postsupport and tunnel walls had on the flow field. This study revealed that although the overall forces and moments could be experimentally accounted for, the detailed flow features, such as the surface pressure distributions, could not be accurately simulated without including the post in the computations.

Analysis of Post-Support and Wind-Tunnel Wall Interference on Flow Field about Subsonic High-Lift High-Speed Research Configuration

Analysis of Post-Support and Wind-Tunnel Wall Interference on Flow Field about Subsonic High-Lift High-Speed Research Configuration PDF

Author: National Aeronautics and Space Administration (NASA)

Publisher: Createspace Independent Publishing Platform

Published: 2018-05-29

Total Pages: 46

ISBN-13: 9781720383864

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The present study was performed to determine how significant the interference effects of the wind-tunnel model support system and tunnel walls can be for a high-speed configuration during takeoff and landing conditions. A 5-percent scale model of the Technology Concept Airplane was recently tested in the Langley 14- by 22-Foot Sub-sonic Tunnel. The model was numerically modeled with and without the support and tunnel walls and compared with experimental data. Detailed analysis of the flow provided additional insight concerning what effects the post support and tunnel walls had on the flow field. This study revealed that although the overall forces and moments could be experimentally accounted for, the detailed flow features, such as the surface pressure distributions, could not be accurately simulated without including the post support in the computations.Lessard, Wendy B.Langley Research CenterCOMPUTATIONAL FLUID DYNAMICS; SCALE MODELS; SUPPORT SYSTEMS; WIND TUNNEL MODELS; WIND TUNNEL WALLS; COMPUTATIONAL GRIDS; AERODYNAMIC INTERFERENCE; SUBSONIC FLOW; LIFT; FLOW DISTRIBUTION; PRESSURE DISTRIBUTION; AERODYNAMIC CONFIGURATIONS

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 PDF

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).

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