To simultaneously reduce flow-induced noise and enhance hydraulic performance in centrifugal pumps,this study proposes a bionic volute tongue inspired by the serrated trailing-edge morphology of the long-eared owl win...To simultaneously reduce flow-induced noise and enhance hydraulic performance in centrifugal pumps,this study proposes a bionic volute tongue inspired by the serrated trailing-edge morphology of the long-eared owl wing.Hydraulic performance and volute-induced noise are integrated into a unified evaluation framework,enabling multi-objective optimization of the tongue geometry.An orthogonal experimental design coupled with Computational Fluid Dynamics(CFD)and Computational Fluid Acoustics(CFA)is employed to systematically assess the influence of serration parameters.A matrix-based decision method is then used to identify the optimal configuration balancing efficiency,head,and acoustic performance.The optimized design reduces the area fraction of extremely high-velocity regions(>18 m/s)from 15.21% to 5.38%,corresponding to a 64.63% decrease,while the flow non-uniformity coefficientζis reduced by 26.1%.Under rated operating conditions,the pump head increases by 0.5 m,hydraulic efficiency improves by 5%,and volute-induced noise is reduced by approximately 5 dB.Flow-field analysis indicates that volute-induced noise is the dominant source of hydrodynamic noise,and that the serrated bionic tongue effectively suppresses its intensity.The noise reduction mechanism is attributed to improved rotor-stator interaction,decomposition of large-scale vortical structures,and delayed flow separation,which collectively reduce pressure pulsation at the rotor-stator interface.展开更多
基金the support of the Innovation Fund for National Natural Science Foundation of China(52009050,52461047)Gansu Provincial Higher Education Innovation Fund(2025A-033).
文摘To simultaneously reduce flow-induced noise and enhance hydraulic performance in centrifugal pumps,this study proposes a bionic volute tongue inspired by the serrated trailing-edge morphology of the long-eared owl wing.Hydraulic performance and volute-induced noise are integrated into a unified evaluation framework,enabling multi-objective optimization of the tongue geometry.An orthogonal experimental design coupled with Computational Fluid Dynamics(CFD)and Computational Fluid Acoustics(CFA)is employed to systematically assess the influence of serration parameters.A matrix-based decision method is then used to identify the optimal configuration balancing efficiency,head,and acoustic performance.The optimized design reduces the area fraction of extremely high-velocity regions(>18 m/s)from 15.21% to 5.38%,corresponding to a 64.63% decrease,while the flow non-uniformity coefficientζis reduced by 26.1%.Under rated operating conditions,the pump head increases by 0.5 m,hydraulic efficiency improves by 5%,and volute-induced noise is reduced by approximately 5 dB.Flow-field analysis indicates that volute-induced noise is the dominant source of hydrodynamic noise,and that the serrated bionic tongue effectively suppresses its intensity.The noise reduction mechanism is attributed to improved rotor-stator interaction,decomposition of large-scale vortical structures,and delayed flow separation,which collectively reduce pressure pulsation at the rotor-stator interface.
