Numerical Study of the Effect of Splitter Blades on the Flow-Induced Noise of Hydraulic TurbineOA
In order to study the effect of splitter blades on the internal and external sound field of the hydraulic turbine,the paper chose a centrifugal pump with a specific speed ns=33 reversed as a hydraulic turbine as the research object,and added the short blades on the original impeller to form a new splitter impeller.Based on the Re-Normalization Group(RNG)k-εturbulence model to conduct numerical simulation for the hydraulic turbine,this thesis calculated the internal and external acoustic field by means of the acoustic boundary element(BEM)and finite element(FEM)and analyzed the noise radiation characteristics of the two models under different working conditions.The results show that the blade frequency is the main factor affecting the inlet and outlet sound pressure,and the optimized model decreases the inlet and outlet sound pressure levels by 6.84 and 7.24 dB in optimal working conditions.Rotor-stator interaction is the main reason for the flow-induced noise of hydraulic turbine volute appearing,the optimized model can effectively reduce the impeller and volute rotor-stator interaction and the flow-induced noise of volute.Outfield maximum sound pressure appears at the inlet and the volute tongue,which decreased by 1.84,6.07,and 5.24 dB at each operating condition.To sum up,splitter blades can improve hydraulic characteristics and flow field noise in the hydraulic turbine.
Fengxia Shi;Guangbiao Zhao;Yucai Tang;Haonan Zhan;Pengcheng Wang
School of Energy and Power Engineering,Lanzhou University of Technology,Lanzhou,730050,China Key Laboratory of Fluid Machinery and Systems of Gansu,Lanzhou,730050,ChinaSchool of Energy and Power Engineering,Lanzhou University of Technology,Lanzhou,730050,ChinaSchool of Energy and Power Engineering,Lanzhou University of Technology,Lanzhou,730050,ChinaSchool of Energy and Power Engineering,Lanzhou University of Technology,Lanzhou,730050,ChinaSchool of Energy and Power Engineering,Lanzhou University of Technology,Lanzhou,730050,China
能源科技
Hydraulic turbinesplitter bladespressure fluctuationsound field
《Sound & Vibration》 2024 (1)
P.101-117,17
the support of the Science and Technology Plan Project of Gansu Province,China(Grant Nos.20JR5RA447,20JR10RA174,20JR10RA203)Colleges and Universities Industrial Support Program Projects of Gansu Province(Grant No.2020C-20)Key Laboratory of Fluid and Power Machinery,Ministry of Education,Xihua University(Grant No.szjj2019-016,LTDL2020-007).
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