The following information was submitted:
Transactions: WSEAS TRANSACTIONS ON FLUID MECHANICS
Transactions ID Number: 89-381
Full Name: Pietro Zunino
Position: Professor
Age: ON
Sex: Male
Address: Via Montallegro 1, I-16145, Genova
Country: ITALY
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E-mail address: pietro.zunino@unige.it
Other E-mails: francesca.satta@unige.it
Title of the Paper: time-varying flow investigation of synthetic jet effects on a separating boundary layer
Authors as they appear in the Paper: Francesca Satta, Daniele Simoni, Marina Ubaldi, Pietro Zunino, Francesco Bertini
Email addresses of all the authors: francesca.satta@unige.it,daniele.simoni@unige.it,marina.ubaldi@unige.it,pietro.zunino@unige.it,francesco.bertini@aviogroup.com
Number of paper pages: 10
Abstract: This paper is focused on the investigation of the interaction between a synthetic jet and the boundary layer which develops over a flat plate subjected to an adverse pressure gradient typical of a high-lift low-pressure turbine profile. Two different Reynolds numbers of the main flow, Re = 200000 and Re = 70000, typical of the low-pressure turbine operating conditions during the take-off/landing and cruise phases, respectively, have been investigated. Wall static pressure distributions along the plate showed the different effects induced by the jet on the boundary layer separation with the jet Strouhal numbers investigated. The device capability of suppressing the large laminar separation bubble which occurs for the uncontrolled condition has been more in depth investigated by means of hot-wire time-mean and ensemble averaged measurements. The phase-locked ensemble averaging technique, synchronized with the synthetic jet frequency, has been employed to distinguish !
the effects induced by the jet during the blowing and the suction phases. The active device has been proved to be able to control the laminar separation bubble induced by a strong adverse pressure gradient, also at the low Reynolds number condition tested. The ensemble averaged measurements showed that a larger contribution to the reduction of the boundary layer velocity defect is obtained during the suction phase of the jet.
Keywords: Boundary layer control, Separated boundary layer, Low-pressure turbines, Synthetic jet, Phase-locked measurements, Hot-wire anemometry
EXTENSION of the file: .pdf
Special (Invited) Session: experimental investigation of synthetic jet - separated boundary layer interaction
Organizer of the Session: 697-308
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