Title:	Experimental investigation of the unsteady stator/rotor wake characteristics downstream of an axial air turbine
Other Titles:	Experimentální výzkum nestacionárních charakteristik staorového/rotorového úplavu za axiální vzduchovou turbínou
Authors:	Duda, Daniel Yanovych, Vitalii Uruba, Václav Žitek, Pavel Milčák, Petr Jelínek, Tomáš Němec, Martin
Citation:	DUDA, D. YANOVYCH, V. URUBA, V. ŽITEK, P. MILČÁK, P. JELÍNEK, T. NĚMEC, M. Experimental investigation of the unsteady stator/rotor wake characteristics downstream of an axial air turbine. International Journal of Turbomachinery, Propulsion and Power, 2021, roč. 6, č. 3, s. nestránkováno. ISSN: 2504-186X
Issue Date:	2021
Publisher:	MDPI
Document type:	preprint preprint
URI:	2-s2.0-85110477662 http://hdl.handle.net/11025/45651
ISSN:	2504-186X
Keywords in different language:	Length-scale;Particle Image Velocimetry;PIV;Turbine;Turbine test facility;Turbomachinery;Wake
Abstract in different language:	A feasibility study of velocity field measurements using the Particle Image Velocimetry (PIV) method in an axial air turbine model is presented. The wakes past the blades of the rotor wheel were observed using the PIV technique. Data acquisition was synchronized with the shaft rotation; thus, the wakes were phase averaged for statistical analysis. The interaction of the rotor blade wakes with the stator ones was investigated by changing the stator wheel’s angle. The measurement planes were located just behind the rotor blades, covering approximately 3 cm × 3 cm in axial × tangential directions. The spatial correlation function suggests that the resolution used is sufficient for the large-scale flow-patterns only, but not for the small ones. The scales of fluctuations correspond to the shear layer thickness at the mid-span plane but, close to the end-wall, they contain larger structures caused by the secondary flows. The length-scales of the fluctuations under off-design conditions display a dependence on the area of the stator and rotor wakes cross-sections, which, in turn, depend on their angle. The obtained experimental data are to be used for the validation of mathematical simulation results in the future.
Rights:	© authors
Appears in Collections:	Preprinty / Preprints (KKE) Preprinty / Preprints (CEV) OBD

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