Experimental Investigation of the Unsteady Stator/Rotor Wake Characteristics Downstream of an Axial Air Turbine

0545831 - ÚT 2022 RIV CH eng J - Journal Article
Duda, D. - Jelínek, T. - Milčák, P. - Němec, M. - Uruba, Václav - Yanovych, Vitalii - Žitek, P.
Experimental Investigation of the Unsteady Stator/Rotor Wake Characteristics Downstream of an Axial Air Turbine.
International Journal of Turbomachinery, Propulsion and Power. Roč. 6, č. 3 (2021), č. článku 22. E-ISSN 2504-186X
R&D Projects: GA TA ČR(CZ) TN01000007
Institutional support: RVO:61388998
Keywords : Particle Image Velocimetry * turbine * turbine test facility * length-scale * turbomachinery * wake
OECD category: Applied mechanics
Method of publishing: Open access
https://www.mdpi.com/2504-186X/6/3/22/htm

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 x 3 cm in axial x 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.
Permanent Link: http://hdl.handle.net/11104/0323075