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Wavelet analysis of vortical structures in turbomachinery applied to PIV data

Schäfer, Philipp and Cierpka, Christian and Rehder, Hans-Jürgen and Röhle, Ingo (2011) Wavelet analysis of vortical structures in turbomachinery applied to PIV data. ASME Turbo Expo 2011, 6.-10.Juni 2011, Vancouver, Kanada.

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Abstract

In this paper the unsteady flow field of a highly loaded turbine rotor blade at different transonic Mach numbers by means of Particle Image Velocimetry (PIV) is investigated. The experiments are performed using the linear cascade wind tunnel at DLR Goettingen at isentropic exit Mach numbers 0.7, 0.9, and 1.1. The process of vortex shedding at the trailing edge of the blade and its proceeding downstream in the wake area is analyzed using a wavelet based vortex identification algorithm. The wavelet algorithm automatically detects vortices and extracts e.g. their position, their vorticity, and their convection velocity. This procedure enables a statistical analysis on the basis of numerous PIV recordings. The vortex production, the downstream transport and the vortex decay are observed successfully. The Strouhal number and the shedding frequency are directly derived from the vortex position and confirm previous investigations. The PIV combined with a wavelet based analysis constitutes a remarkable insight to time dependent flow structures.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:Wavelet analysis of vortical structures in turbomachinery applied to PIV data
Authors:
AuthorsInstitution or Email of Authors
Schäfer, PhilippAT-TU
Cierpka, ChristianUniBW München
Rehder, Hans-JürgenAT-TU
Röhle, IngoAT-TU
Date:2011
Status:Published
Keywords:Particle Image Velocimetry Turbine Wavelet Analysis Unsteady flow vortex Strouhal number shedding frequency
Event Title:ASME Turbo Expo 2011
Event Location:Vancouver, Kanada
Event Type:international Conference
Event Dates:6.-10.Juni 2011
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:other
DLR - Research area:Aeronautics
DLR - Program:L - no assignement
DLR - Research theme (Project):L -- no assignement
Location: Göttingen
Institutes and Institutions:Institute of Propulsion Technology > Turbine
Institute of Propulsion Technology
Deposited By: Philipp Schäfer
Deposited On:22 Jun 2011 10:56
Last Modified:22 Jun 2011 10:56

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