The following information was submitted:
Transactions: WSEAS TRANSACTIONS ON FLUID MECHANICS
Transactions ID Number: 28-330
Full Name: Pietro Zunino
Position: Professor
Age: ON
Sex: Male
Address: University of Genova, DIMSET, Via Montallegro 1
Country: ITALY
Tel: +393204320006
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E-mail address: pietro.zunino@unige.it
Other E-mails: zunmp@unige.it
Title of the Paper: Von Karman vortices formation at the trailing edge of a turbine blade
Authors as they appear in the Paper: Daniele Simoni, Marina Ubaldi, Pietro Zunino
Email addresses of all the authors: daniele.simoni@unige.it, zunmp@unige.it, pietro.zunino@unige.it
Number of paper pages: 10
Abstract: The paper presents the results of an experimental investigation of the von Karman vortices formation at the blade trailing edge of a large scale turbine cascade. The mean and time varying characteristics of the flow in the trailing edge region were measured by means of a two-component fiber-optic laser Doppler velocimeter over an experimental grid very close to the blade trailing edge. A phase locked ensemble averaging technique has been applied to separate coherent and incoherent contributions in the instantaneous LDV data. The trailing edge of the central blade of the cascade has been instrumented with a multisensor surface mounted hot-film probe. The probe outputs proportional to the instantaneous wall shear stress were sampled simultaneously with a filtered reference signal from a hot-wire probe located in the wake and sensitive to the vortex periodicity. Organised periodic structures have been clearly identified in the flow and their evolution in time has b!
een documented through a sequence of instantaneous pictures of the periodic flow field during a cycle of the vortex shedding. Time-averaged and time-resolved ensemble averaged wall shear stresses on the blade trailing edge help to identify the positions where the boundary layers separate and to analyze the effects of the vortex shedding on the wall shear stress along the trailing edge.
Keywords: Turbine blade boundary layers, Turbine blade wakes, Von Karman vortices, Wall shear stress, Hot-film measurements
EXTENSION of the file: .pdf
Special (Invited) Session: Boundary layer separation from the trailing edge of a turbine blade
Organizer of the Session: 595-626
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