naa a22 4500 510765874 CHVBK 20180411083156.0 cr unu---uuuuu 180411e20131201xx s 000 0 eng 10.1007/s11630-013-0662-6 doi (NATIONALLICENCE)springer-10.1007/s11630-013-0662-6 Temporal behaviour of a corner separation in a radial vaned diffuser of a centrifugal compressor operating near surge [Elektronische Daten] [A. Marsan, I. Trébinjac, S. Coste, G. Leroy] The temporal behaviour of a flow separation in the hub-suction side corner of a transonic diffuser is studied thanks to unsteady numerical simulations based on the phase-lagged approach. The validity of the numerical results is confirmed by comparison with experimental unsteady pressure measurements. An analysis of the instantaneous skin-friction pattern and particles trajectories is presented. It highlights the topology of the separation and its temporal behaviour. The major result is that, despite of a highly time-dependent core flow, the separation is found to be a "fixed unsteady separation” characterized by a fixed location of the main saddle of the separation but an extent of the stall region modulated by the pressure waves induced by the impeller-diffuser interaction. Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag Berlin Heidelberg, 2013 Corner Separation nationallicence Radial Vaned Diffuser nationallicence Centrifugal Compressor nationallicence Surge nationallicence N1 : Number of blades in the impeller nationallicence N2 : Number of blades in the radial vaned diffuser nationallicence Ω [rad/s] : Rotation speed of the impeller nationallicence T1 : Temporal period of the flow in the impeller nationallicence T2 : Temporal period of the flow in the diffuser nationallicence T0[○K] : Total temperature nationallicence p0 [Pa] : Total pressure nationallicence P : Static pressure nationallicence $$\vec v$$ : Flow velocity vector nationallicence $$\dot m\left[ {kg/s} \right]$$ : Massflow nationallicence Cp : Static pressure recovery coefficient of the diffuser nationallicence K : Total pressure loss coefficient of the diffuser nationallicence Marsan A. Laboratoire de Mécanique des Fluides et d'Acoustique, UMR CNRS 5509 École Centrale de Lyon, 69134, Ecully, France aut Trébinjac I. Laboratoire de Mécanique des Fluides et d'Acoustique, UMR CNRS 5509 École Centrale de Lyon, 69134, Ecully, France aut Coste S. Turbomeca, Safran group, 64511, Bordes, France aut Leroy G. Turbomeca, Safran group, 64511, Bordes, France aut Journal of Thermal Science Springer Berlin Heidelberg 22/6(2013-12-01), 555-564 1003-2169 22:6<555 2013 22 11630 https://doi.org/10.1007/s11630-013-0662-6 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11630-013-0662-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Marsan A. Laboratoire de Mécanique des Fluides et d'Acoustique, UMR CNRS 5509 École Centrale de Lyon, 69134, Ecully, France aut NATIONALLICENCE 700 1- Trébinjac I. Laboratoire de Mécanique des Fluides et d'Acoustique, UMR CNRS 5509 École Centrale de Lyon, 69134, Ecully, France aut NATIONALLICENCE 700 1- Coste S. Turbomeca, Safran group, 64511, Bordes, France aut NATIONALLICENCE 700 1- Leroy G. Turbomeca, Safran group, 64511, Bordes, France aut NATIONALLICENCE 773 0- Journal of Thermal Science Springer Berlin Heidelberg 22/6(2013-12-01), 555-564 1003-2169 22:6<555 2013 22 11630 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer