Author(s): Hongjiang Pan; Fengrong Yu; Yun Zeng; Yuchen Liu; Jianping Guo

Linked Author(s): Yuchen Liu

Keywords: Hydraulic turbine; Flow-induced noise; Defective runner blade; Acoustic power level; Numerical simulation

Abstract: In order to analyse flow-induced noise distribution law under the defective runner blade, this paper performs defective treatment on the runner blade according to the HLA855a-LJ-250 hydraulic turbine model. Two kinds of blade models, intact blade and outlet side abrasive blade, are established respectively, and the Realizable k-ɛ turbulence model and broadband noise source model are used to simulate the hydraulic turbine under rated operating conditions. The simulation results show: 1) Double-row leaf grilles and runner blade are the main dipole flow-induced noise sources; 2) Significant differences in the distribution of the acoustic power levels of the double-row leaf grilles’ characteristic blades and the runners’ characteristic blades under different Schemes; 3) Runner defective blades have less effect on the acoustic power level of spiral case, the rest of the overflow components acoustic power level has a tendency to increase, especially the runner has the greatest impact. The maximum increase in acoustic power level of the runner is almost 17 dB, followed by double-row leaf grilles with an increase of around 8 dB. Therefore, critical attention needs to be paid to the abnormal noise signals of runner and double-row leaf grilles.

DOI: https://doi.org/10.1088/1742-6596/2752/1/012025

Year: 2023