Simulation of air admission in a propeller hydroturbine during transient events

28th IAHR symposium on Hydraulic Machinery and Systems

Nicolle, J.^1 ; Morissette, J.-F.^1

Hydro-Québec's Research Institute (IREQ), Varennes, Canada^1

关键词: Biphasic simulations;    Experimental strains;    Hydroturbines;    Propeller blades;    Structural loading;    Structural modeling;    Structural stress;    Transient events;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/49/7/072008/pdf
DOI  :  10.1088/1755-1315/49/7/072008

来源: IOP

【 摘 要 】

In this study, multiphysic simulations are carried out in order to model fluid loading and structural stresses on propeller blades during startup and runaway. It is found that air admission plays an important role during these transient events and that biphasic simulations are therefore required. At the speed no load regime, a large air pocket with vertical free surface forms in the centre of the runner displacing the water flow near the shroud. This significantly affects the torque developed on the blades and thus structural loading. The resulting pressures are applied to a quasi-static structural model and good agreement is obtained with experimental strain gauge data.