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Numerical and Experimental Study on Flow-induced Noise at Blade-passing Frequency in centrifugal pumps

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Chinese Journal of Mechanical Engineering 2014年第3期27卷 606-614页

作者： YANG Jun YUAN Shouqi YUAN Jianping SI Qiaorui PEI Ji Research Center of Fluid Machinery Engineering and Technology Jiangsu University

With the increasing noise pollution, low noise optimization of centrifugal pimps has become a hot topic. However, experimental study on this problem is unacceptable for industrial applications due to unsustainable cost. A hybrid method that couples computational fluid dynamics （CFD） with computational aeroacoustic software is used to predict the flow-induced noise of pumps in order to minimize the noise of centrifugal pumps in actual projects. Under Langthjem＇s assumption that the blade surface pressure is the main flow-induced acoustic source in centrifugal pumps, the blade surface pressure pulsation is considered in terms of the acoustical sources and simulated using CFX software. The pressure pulsation and noise distribution in the near-cutoff region are examined for the blade-passing frequency （BPF） noise, and the sound pressure level （SPL） reached peaks near the cutoff that corresponded with the pressure pulsation in this region. An experiment is performed to validate this prediction. Four hydrophones are fixed to the inlet and outlet ports of the test pump to measure the flow-induced noise from the four-port model. The simulation results for the noise are analyzed and compared with the experimental results. The variation in the calculated noise with changes in the flow agreed well with the experimental results. When the flow rate was increased, the SPL first decreased and reached the minimum near the best efficient point （BEP）; it then increased when the flow rate was further increased. The numerical and experimental results confirmed that the BPF noise generated by a blade-rotating dipole roughly reflects the acoustic features of centrifugal pumps. The noise simulation method in current study has a good feasibility and suitability, which could be adopted in engineering design to predict and optimize the hydroacoustic behavior of centrifugal pumps.

关键词： centrifugal pumps flow-induced noise prediction blade-passing noise blade surface pressure pulsations

Study of Unforced Unsteadiness in centrifugal Pump at Partial Flow Rates

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Journal of Thermal Science 2021年第1期30卷 88-99页

作者： YANG Jun XIE Tian LIU Xiaohua SI Qiaorui LIU Jun School of Energy and Power Engineering University of Shanghai for Science and TechnologyShanghai 200093China Key Laboratory of Fluid and Power Machinery(Xihua University) Ministry of EducationChengdu 610039China Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering Shanghai 200093China School of Aeronautics and Astronautics Shanghai Jiao Tong UniversityShanghai 200240China Research Center of Fluid Machinery Engineering and Technology Jiangsu UniversityZhenjiang 212013China

In order to explore the unforced unsteadiness of centrifugal pumps,a 2-D frequency domain imaging display technology was used to study the development of these unsteady flow structures at partial flow conditions.The results showed that,the unsteady flow field was not only affected by rotor and stator interaction,but also appeared an unforced unsteadiness with fundamental frequency of St≈0.23 around the impeller throat area.Moreover,as the flow rates decreased,this unsteady flow structure gradually weakened and disappeared.When the flow rate was reduced to 0.6 times of design flow rate,another two unforced unsteady flow structures with characteristic frequencies of St≈0.0714 and St≈0.12 began to appear in the same area.Therefore,with the operating condition smaller than design flow rate,the internal flow became more and more complex.In addition to the forced unsteadiness,the unforced unsteadiness which is not connected with the blade passage frequency became more and more obvious.

关键词： centrifugal pumps partial flow conditions pressure pulsations unforced unsteadiness 2-D frequency domain visualization method

3-D CFD simulation of transients in multiple pump system with some pumps being stopped

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Journal of Hydrodynamics 2021年第3期33卷 583-592页

作者： Yue-fei Liu Jian-xu Zhou Qiang Guo Ai-li Shen Jian Zhang College of Water Conservancy and Hydropower Engineering Hohai UniversityNanjing210024China

The computational fluid dynamics(CFD)approach can be used to obtain both internal and external characteristics of centrifugal pumps,and the variations of the hydrodynamic force,the pressure and the torque on the blades acquired by the CFD are highly associated with the safety of the pumping system.Based on the CFD simulations,this paper investigates the stopping characteristics of multiple pumps with some pumps being stopped.The 3-D geometric model is built,including all 6 pumps,the valves,the pipes,the tanks and other components,and using the Realizable k-ε turbulence model.The CFD results for the operating points agree well with the results from the theoretical analysis.With some pumps being stopped,the key parameters of the operating pumps would not be stable,with a larger fluctuation;the direction of the hydrodynamic force might be opposite with more than 3 stopped pumps.For the stopped pumps,the maximum reverse values of the discharge and the rotational speed would be larger when fewer pumps are stopped,and could be more than 120%of the rated values,which is dangerous for the pumping system.The CFD results could help understanding the stopping process of multiple pump systems with some pumps being stopped.

关键词： centrifugal pumps some pumps stop computational fluid dynamics(CFD) operating points maximum reverse value

STUDY ON FLOWS THROUGH centrifugal PUMP IMPELLER BY TURBULENT SIMULATION

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Journal of Hydrodynamics 1997年第1期9卷 11-23页

作者： Dai, Jiang Wu, Yulin Cao, Shuliang Tsinghua Univ Beijing China

A finite volume numerical method is presented for simulating internal turbulent flows on the blade-to-blade surface through a centrifugal pump impeller, in which, a mesh in body-fitted coordinates is generated for the computation. The SIMPLEC algorithm is utilized for solving governing equations of incompressible viscous/turbulent flows through the pump impeller. The K-Ε turbulence model is adopted to describe the turbulent flow process. Some worthwhile simulated results are presented.

关键词： centrifugal pumps Simulation Turbulence Turbulent flow

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矿用抗静电阻燃聚氯乙烯硬管材通过技术鉴定

能源技术与管理 1995年第2期 63-63页

作者：欧明浩

矿用抗静电阻燃聚氯乙烯硬管材通过技术鉴定欧明浩由江苏省煤矿研究所与鹤壁晨光塑料制品厂共同研制的“矿用抗静电阻燃聚氯乙烯硬管材”，于１９９４年１２月通过了由江苏省煤炭工业总公司组织的技术鉴定。该产品采用聚氯乙烯树脂为基... 详细信息

矿用抗静电阻燃聚氯乙烯硬管材通过技术鉴定欧明浩由江苏省煤矿研究所与鹤壁晨光塑料制品厂共同研制的“矿用抗静电阻燃聚氯乙烯硬管材”，于１９９４年１２月通过了由江苏省煤炭工业总公司组织的技术鉴定。该产品采用聚氯乙烯树脂为基材，添加改性剂、稳定剂、润滑剂、乙...

关键词： vane pattern centrifugal pumps pump vane casting