Measurement of unsteady flow reattachment on an airfoil with an ice shape

Phillip J. Ansell; Michael B. Bragg

doi:10.2514/1.J052519

Measurement of unsteady flow reattachment on an airfoil with an ice shape

Phillip J. Ansell, Michael B. Bragg

Aerospace Engineering

Research output: Contribution to journal › Comment/debate › peer-review

Abstract

An innovative method for determining the unsteady shear-layer reattachment location downstream of a flow obstacle using a surface-mounted hot-film array is proposed. The method uses strong levels of anticorrelation between adjacent probes across short time windows to determine the unsteady location of shear-layer reattachment. The resulting time histories for the unsteady reattachment location on the airfoil compared well with the mean reattachment location and the estimated reattachment zone determined from surface oil-flow visualization. Similar trends were observed in the probability density function of the unsteady reattachment location between the current investigation and PIV-derived reattachment data. Implementation of this method to the separation bubble downstream of a simple geometry, like a backward-facing step, would assist in further development of this method.

Original language	English (US)
Pages (from-to)	656-659
Number of pages	4
Journal	AIAA journal
Volume	52
Issue number	3
DOIs	https://doi.org/10.2514/1.J052519
State	Published - Mar 2014

ASJC Scopus subject areas

Aerospace Engineering

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10.2514/1.J052519

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title = "Measurement of unsteady flow reattachment on an airfoil with an ice shape",

abstract = "An innovative method for determining the unsteady shear-layer reattachment location downstream of a flow obstacle using a surface-mounted hot-film array is proposed. The method uses strong levels of anticorrelation between adjacent probes across short time windows to determine the unsteady location of shear-layer reattachment. The resulting time histories for the unsteady reattachment location on the airfoil compared well with the mean reattachment location and the estimated reattachment zone determined from surface oil-flow visualization. Similar trends were observed in the probability density function of the unsteady reattachment location between the current investigation and PIV-derived reattachment data. Implementation of this method to the separation bubble downstream of a simple geometry, like a backward-facing step, would assist in further development of this method.",

author = "Ansell, {Phillip J.} and Bragg, {Michael B.}",

note = "Funding Information: Support for this program was provided via NASA Small Business Technology Transfer (STTR) contract NNX10CB57C. The authors wish to thank Michael Kerho and Rolling Hills Research Corporation, along with Mark Davis and the staff of NASA Dryden Flight Research Center for their contributions to this work.",

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N2 - An innovative method for determining the unsteady shear-layer reattachment location downstream of a flow obstacle using a surface-mounted hot-film array is proposed. The method uses strong levels of anticorrelation between adjacent probes across short time windows to determine the unsteady location of shear-layer reattachment. The resulting time histories for the unsteady reattachment location on the airfoil compared well with the mean reattachment location and the estimated reattachment zone determined from surface oil-flow visualization. Similar trends were observed in the probability density function of the unsteady reattachment location between the current investigation and PIV-derived reattachment data. Implementation of this method to the separation bubble downstream of a simple geometry, like a backward-facing step, would assist in further development of this method.

AB - An innovative method for determining the unsteady shear-layer reattachment location downstream of a flow obstacle using a surface-mounted hot-film array is proposed. The method uses strong levels of anticorrelation between adjacent probes across short time windows to determine the unsteady location of shear-layer reattachment. The resulting time histories for the unsteady reattachment location on the airfoil compared well with the mean reattachment location and the estimated reattachment zone determined from surface oil-flow visualization. Similar trends were observed in the probability density function of the unsteady reattachment location between the current investigation and PIV-derived reattachment data. Implementation of this method to the separation bubble downstream of a simple geometry, like a backward-facing step, would assist in further development of this method.

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Measurement of unsteady flow reattachment on an airfoil with an ice shape

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