Evaluation on Interference Effects on a Lifting Model in the AEDC-PWT 4- Ft Transonic Tunnel

Jacocks, J L

doi:10.21236/ad0868290

Cited by 4 publications

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“…Jacocks has shown (Ref. 6) that, while it is possible to obtain correct lift data on an aircraft configuration by changing wall porosity with Mach number, the drag and pitching moment thus obtained are not interference free. A primary goal of the experimental effort reported herein was to provide additional insight into the degree and mechanism of the drag and pitching-moment discrepancies.…”

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confidence: 99%

An Investigation of Three-Dimensional Wall Interference in a Variable Porosity Transonic Wind Tunnel

Binion¹

1974

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20. ABSTRACT (Continued) be misconstrued as an upwash interference. The porosity schedule currently used in Tunnel 4T is shown to result in negligible blockage interference. The data indicate that the available subsonic theory will provide reasonable upwash and pitching-moment corrections provided one knows the "right" value of the boundary condition and the flow is everywhere subsonic. At Mach numbers less than unity, with moderate to large regions of supercritical flow over the model, the interference is characterized by an apparent distortion of the supercritical portion of the flow field which is not alleviated by porosity variations. At supersonic Mach numbers, the interference is caused by wave reflections.

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An Investigation of Three-Dimensional Wall Interference in a Variable Porosity Transonic Wind Tunnel

Binion¹

1974

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Computer studies of hybrid slotted working sections with minimum steady interference at subsonic speeds

Mabey¹,

Steinle

1985

Aeronaut. j.

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SummaryCurrently there is renewed interest in the evaluation and reduction of steady wind tunnel wall interference, especially for large models.Evaluation of previous predictions for perforated and slotted tunnels suggests that a hybrid slotted tunnel, ie a slotted tunnel with closed slats and perforated slots) should offer minimum corrections for upwash, flow curvature and solid blockage. This suggestion is confirmed by the present computer studies of a range of rectangular hybrid slotted tunnels.The computer studies are for tunnel working section height to breadth ratios of 0·835 and 0·600 over the Mach number range from 0 to 0·85. Wings swept at 28° and 50°, with ratios of model span to tunnel breadth varying from 0 to 0·7, are considered. An idealised fuselage shape is used to predict solid and wake blockage corrections for the wall configurations selected on the basis of minimum upwash and curvature interference.

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Tunnel interference reduction on a finite airfoil

Lo¹

1975

Journal of Aircraft

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Evaluation on Interference Effects on a Lifting Model in the AEDC-PWT 4- Ft Transonic Tunnel

Cited by 4 publications

References 1 publication

An Investigation of Three-Dimensional Wall Interference in a Variable Porosity Transonic Wind Tunnel

An Investigation of Three-Dimensional Wall Interference in a Variable Porosity Transonic Wind Tunnel

Computer studies of hybrid slotted working sections with minimum steady interference at subsonic speeds

Tunnel interference reduction on a finite airfoil

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