Status of three-dimensional adaptive-wall test section development at AEDC

Parker, R.; Erickson, John C.

doi:10.2514/6.1984-624

Cited by 5 publications

(3 citation statements)

References 7 publications

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“…This conclusion motivated the second three-dimensional AEDC pro gram (Parker & Erickson 1984, Kraft et al 1986, which was carried out in a one-foot-square test section having a total of 64 variable-porosity wall segments, distributed over all four walls, and controllable, uniform plenum-chamber pressure. In the tests reported, the 64 wall controls were operated in 14 groups.…”

Section: Tunnels With Deformable Impermeable Wallsmentioning

confidence: 97%

Adaptive Wind Tunnels

Sears¹,

Erickson²

1988

Annu. Rev. Fluid Mech.

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Section: Tunnels With Deformable Impermeable Wallsmentioning

confidence: 97%

Adaptive Wind Tunnels

Sears¹,

Erickson²

1988

Annu. Rev. Fluid Mech.

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“…The AEDC adaptive waH test section and its control are described in more detail by Parker and Erickson (1982). At that time fully automated operation of the test section was scheduled for October 1982, but this has been somewhat delayed.…”

Section: D Test Sectmentioning

confidence: 99%

Advances in Adaptive Wall Wind Tunnel Technique

Ganzer

1986

Recent Advances in Aerodynamics

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A brief outline is given of the adaptive wall concept. The research projects on this subject-carried out during the past ten years in the United States and Western Europe-are reviewed. The work done hereto at the Technical University of Berlin is discussed in some detail. It includes comprehensive tests of aerofoils in a tunnel with two flexible walls as well as tests of three-dimensional models in a tunnel with eight flexible walls. First complete wall adaptations for a lifting wing-body configuration were accomplished, giving evidence of the feasibility of the adaptive wall concept for 3D-model tests.

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“…This is particularly important in concepts using 'adaptive ' or so-called 'smart' wind tunnels in which the walls are configured to achieve near free-field conditions. As described in Lock Sears (1974), and Parker & Erickson (1982), the adaptive approach involves an iterative adjustment of the wall shape with a feedback loop involving a prediction of the wall-model interaction, which may be based on a computational simulation. It is therefore evident that the practical feasibility of the method depends on the rapidity of response of the predictive part of the smart-wall procedure.…”

Section: Introductionmentioning

confidence: 99%

An asymptotic theory of wind-tunnel-wall interference on subsonic slender bodies

Malmuth

1987

J. Fluid Mech.

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An asymptotic theory of solid cylindrical wind-tunnel-wall interference about subsonic slender bodies has been developed. The basic approximation used is one of large wall-radius to body-length ratio. Matched asymptotic expansions show that in contrast to the analogous two-dimensional problem of a confined airfoil, three regions exist. Besides the incompressible crossflow and nearly axisymmetric zones, a wall layer exists where reflection in the wall of the line source representing the body becomes of dominant importance. From the theory, the interference pressures are shown to be approximately constant for closed bodies. Also demonstrated is that D'Alembert's paradox holds for interference drag of such shapes. Numerical studies comparing the exact theory to the asymptotic model which provides drastic simplifications, show that the latter can be used with reasonable accuracy to describe flows, even where the characteristic tunnel-radius to body-length ratio is as low as 1.5.

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Status of three-dimensional adaptive-wall test section development at AEDC

Cited by 5 publications

References 7 publications

Adaptive Wind Tunnels

Adaptive Wind Tunnels

Advances in Adaptive Wall Wind Tunnel Technique

An asymptotic theory of wind-tunnel-wall interference on subsonic slender bodies

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