Theoretical and experimental study of flow-control devices for inlets of indraft wind tunnels

Ross, James C.

doi:10.31274/rtd-180813-8642

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“…If these conditions were known, the upstream flow turbulence condition could be found and used as a reference to estimate the test section turbulence in its current state. Turbulence levels below 0.1% are considered acceptable and levels below 0.05% are required for any kind of laminar flow research 25 . But because 0.5% has been deemed an adequate turbulence level by the overseer of the wind tunnel, Dr. Jin Tso, no significant reduction of the turbulence below this level will be sought.…”

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confidence: 99%

An Investigative Study of Gurney Flaps on a NACA 0036 Airfoil

Altmann¹

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This project examined the effect of Gurney flaps on a 2D, 2-ft chord NACA 0036 airfoil in the Cal Poly 3"x4" low speed wind tunnel at 25 m/s. It also covered the numerical simulation of the experiment in computational fluid dynamics (CFD). During the study, problems with the wind tunnel data were seen. After a careful diagnosis, the problem was traced to dirty flow conditioners which were subsequently replaced.Five Gurney flaps at 1, 2, 3, 4, and 5% of the chord were tested. The Gurney flaps had the effect of eliminating the lift reversal effect and lowering the profile drag at low angles of attack, ranging from 4-27%. The optimal Gurney flap appeared to be 2% of the chord. CFD modeling of the problem had limited success, with the best results coming from Mentor"s k-w SST turbulence model. This model reproduced the non-linear lift curve, and captured the trend in rising drag fairly well, but failed to predict the correct point of separation. Attempts to model the Gurney flap in CFD were unsuccessful. v ACKNOWLEDGEMENTS

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Section: Screen Selectionmentioning

confidence: 99%

An Investigative Study of Gurney Flaps on a NACA 0036 Airfoil

Altmann¹

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Theoretical and experimental study of flow-control devices for inlets of indraft wind tunnels

Cited by 1 publication

References 32 publications

An Investigative Study of Gurney Flaps on a NACA 0036 Airfoil

An Investigative Study of Gurney Flaps on a NACA 0036 Airfoil

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