Time-resolved PIV investigation of the secondary instability of cross-flow vortices

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Abstract

Time-resolved PIV measurements of the secondary instability modes of cross-flow vortices are presented. Measurements are performed on a large scale 45o swept wing at chord Reynolds number of 2.17 million in a low turbulence wind-tunnel facility. Using acquisition frequencies of 20 kHz, the present study is the first experimental demonstration of spatio-temporally resolved measurements of these structures. Statistical and spectral analysis reveals a fluctuating velocity field, strongly conditioned in space by the primary stationary cross-flow vortex. The flow structures related to the type-I high-frequency instability and type-III are captured by Proper Orthogonal Decomposition of the instantaneous flow-fields. Their temporal evolution is analysed showing good agreement with previous studies thus confirming that POD is correctly representing the flow structures of the relevant instability modes. The low frequency meandering oscillation of the stationary vortices, first reported by Serpieri &Kotsonis (2016b), is observed and characterised.

Original languageEnglish
Title of host publication10th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2017
PublisherTSFP
Number of pages6
Volume2
ISBN (Electronic)9780000000002
Publication statusPublished - 2017
Event10th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2017 - Chicago, United States
Duration: 6 Jul 20179 Jul 2017
Conference number: 10
http://tsfp10.org/

Conference

Conference10th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2017
Abbreviated titleTSFP 2017
CountryUnited States
CityChicago
Period6/07/179/07/17
Internet address

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