caa a22 4500 606197397 CHVBK 20210128100929.0 cr unu---uuuuu 210128e20150601xx s 000 0 eng 10.1007/s00348-015-1991-x doi (NATIONALLICENCE)springer-10.1007/s00348-015-1991-x Velocity field investigation inside a bulb turbine runner using endoscopic PIV measurements [Elektronische Daten] [S. Lemay, V. Aeschlimann, R. Fraser, G. Ciocan, C. Deschênes] The flow in the inter-blade channels of a bulb turbine was measured using endoscopic cameras integrated to a stereoscopic particle image velocimetry (S-PIV) system. This paper presents results from the measurement campaign and also provides some key conclusions based on the dataset. The technical aspect of the measurement configuration is addressed. The main focus is on the novelties and challenges brought by the use of endoscopic cameras to achieve S-PIV measurements between the runner blades. For the first time in hydraulic rotating machinery, velocity measurements covered 62% of a rotor inter-blade flow. After outlining the techniques used, comparison with laser Doppler velocimetry measurements allows assessing the intrusiveness of the endoscopes. Then, some velocity field analyses are shown. First, the rotor-stator interaction is outlined as the influence of the guide vane wakes on the runner flow. The size, localization, strength and dissipation of those structures are inferred from the information coming from measurements. Finally, the PIV data allow the identification of a vortex located near the suction side of the blades and originating from the corner between the leading edge and the hub when operating the bulb turbine at part-load. Springer-Verlag Berlin Heidelberg, 2015 Lemay S. Hydraulic Machines Laboratory, Laval University, Quebec, Canada aut Aeschlimann V. Hydraulic Machines Laboratory, Laval University, Quebec, Canada aut Fraser R. Hydraulic Machines Laboratory, Laval University, Quebec, Canada aut Ciocan G. Hydraulic Machines Laboratory, Laval University, Quebec, Canada aut Deschênes C. Hydraulic Machines Laboratory, Laval University, Quebec, Canada aut Experiments in Fluids Springer Berlin Heidelberg 56/6(2015-06-01), 1-12 0723-4864 56:6<1 2015 56 348 https://doi.org/10.1007/s00348-015-1991-x text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00348-015-1991-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Lemay S. Hydraulic Machines Laboratory, Laval University, Quebec, Canada aut NATIONALLICENCE 700 1- Aeschlimann V. Hydraulic Machines Laboratory, Laval University, Quebec, Canada aut NATIONALLICENCE 700 1- Fraser R. Hydraulic Machines Laboratory, Laval University, Quebec, Canada aut NATIONALLICENCE 700 1- Ciocan G. Hydraulic Machines Laboratory, Laval University, Quebec, Canada aut NATIONALLICENCE 700 1- Deschênes C. Hydraulic Machines Laboratory, Laval University, Quebec, Canada aut NATIONALLICENCE 773 0- Experiments in Fluids Springer Berlin Heidelberg 56/6(2015-06-01), 1-12 0723-4864 56:6<1 2015 56 348