Draft tube pressure pulsation predictions in Francis turbines with transient Computational Fluid Dynamics methodology

27th IAHR Symposium on Hydraulic Machinery and Systems

Melot, M.^1 ; Nennemann, B.^1 ; Désy, N.^1

Andritz Hydro Ltd., 6100 Trans Canada Hwy., QC

H9R 1B9, Canada^1

关键词: Design phase;    Draft tubes;    Mechanical systems;    Part load;    Part load operation;    Post-processing techniques;    Pressure signal;    Robust designs;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/22/3/032002/pdf
DOI  :  10.1088/1755-1315/22/3/032002

来源: IOP

【 摘 要 】

An automatic Computational Fluid Dynamics (CFD) procedure that aims at predicting Draft Tube Pressure Pulsations (DTPP) at part load is presented. After a brief review of the physics involved, a description of the transient numerical setup is given. Next, the paper describes a post processing technique, namely the separation of pressure signals into synchronous, asynchronous and random pulsations. Combining the CFD calculation with the post-processing technique allows the quantification of the potential excitation of the mechanical system during the design phase. Consequently it provides the hydraulic designer with a tool to specifically target DTPP and thus helps in the development of more robust designs for part load operation of turbines.