Effect of unsteady wake passing frequency on boundary layer transition, experimental investigation and wavelet analysis

M. T. Schobeiri, K. Read, J. Lewalle

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Detailed experimental and theoretical investigations were carried out to study the effect of unsteady wake passing frequency on the boundary layer transition along the concave surface of a curved plate under a zero longitudinal pressure gradient. Periodic unsteady flow with different passing frequencies is generated utilizing an unsteady flow research facility with a rotating cascade of rods positioned upstream of the curved plate. Extensive unsteady boundary layer measurements are carried out. The data are analyzed using conventional and wavelet-based methods. Local time scales are defined as those of the most energetic fluctuations, and are calculated from wavelet transforms of the velocity signals. The dominant time scales are mapped as functions of the distance to the plate, the downstream location, and the phase relative to the wake-passing. Furthermore, conditional sampling is applied, laminar turbulent time scales are calculated and the effects of wake passing frequency on these scales are shown.

Original languageEnglish (US)
Title of host publicationTurbomachinery
PublisherAmerican Society of Mechanical Engineers (ASME)
Volume1
ISBN (Electronic)9780791878781
DOIs
StatePublished - 1995
EventASME 1995 International Gas Turbine and Aeroengine Congress and Exposition, GT 1995 - Houston, United States
Duration: Jun 5 1995Jun 8 1995

Other

OtherASME 1995 International Gas Turbine and Aeroengine Congress and Exposition, GT 1995
CountryUnited States
CityHouston
Period6/5/956/8/95

ASJC Scopus subject areas

  • Engineering(all)

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    Schobeiri, M. T., Read, K., & Lewalle, J. (1995). Effect of unsteady wake passing frequency on boundary layer transition, experimental investigation and wavelet analysis. In Turbomachinery (Vol. 1). American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/95-GT-437