Investigations of rotating stall inception in a propeller turbine runner operating in low-load conditions

29th IAHR Symposium on Hydraulic Machinery and Systems

Houde, S.^1 ; Dumas, G.^1 ; MacIel, Y.^1 ; Deschânes, C.^1

Laval University, 1065 Avenue de la Médecine, Québec

QC

G1V 0A6, Canada^1

关键词: Boundary-layer separation;    Columnar vortices;    Low load;    No load;    Propeller turbines;    Rotating stall inceptions;    Rotating stalls;    Simulation strategies;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/240/2/022021/pdf
DOI  :  10.1088/1755-1315/240/2/022021

来源: IOP

【 摘 要 】

This paper presents a study of the inception mechanism of a rotating stall instability identified on a model propeller turbine during speed-no-load (SNL) operation. It seeks to understand the origins of columnar vortices dominating the flow in the runner in SNL. It is based on the use of an experimentally validated flow simulation strategy using the SAS turbulence modelling approach. Two sets of boundary conditions were used to identify the onset of the columnar vortices and confirm that they are linked with a boundary layer separation on the turbine head cover.