Cavitation characteristics of bionic centrifugal pump based on "nodule effect" of humpback whale

doi:10.11975/j.issn.1002-6819.2022.12.003

	Cavitation characteristics of bionic centrifugal pump based on "nodule effect" of humpback whale
	Weiguo, Zhao; Jiawei, Qin; Xiangfu, Tian; Tianming, Wen
	2022-06-01
发表期刊	Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering
ISSN	1002-6819
卷号	38 期号:12 页码:23-31
摘要	This study aims to determine the cavitation suppression strategy of centrifugal pump for the better cavitation performance of centrifugal pump. A bionic centrifugal pump model was also proposed using the bionic humpback whale fin "nodule effect". The modified SST k-ω Turbulence Model and Z-G-B cavitation model were used to simulate the transient cavitation flow of the prototype pump. The bionic model was verified by the hydraulic performance and cavitation performance tests. A systematic analysis was made to clarify the external and cavitation characteristics of the prototype pump and bionic model, as well as the cavity development, pressure fluctuation, vorticity field, pressure distribution, and turbulent kinetic energy distribution in the impeller channel. The results show that the numerical simulation was in an excellent agreement with the experimental data, where there was the little effect of bionic structure on the hydraulic performance of the prototype pump. The variation ranges of head and efficiency were -0.73%-0.77%, and -1.74%-2.52%, respectively. There was the variation in the cavitation characteristics of the bionic model for the better hydraulic performance of the prototype pump that caused by cavitation. There was the most outstanding fracture cavitation stage, where the fracture head under NPSHa=0.049 working condition increased from 3.59 to 4.01 m, indicating the increase of 11.7%. The bionic model was effectively inhibited the development of cavity for the less volume of cavity. There was the best inhibition effect in the initial stage of cavitation, and the average volume fraction of cavity was reduced by 99.72%. The main frequency of pressure fluctuation in the original model occurred at the blade passing frequency of 50 Hz. There was no change in the bionic model for the main frequency characteristics of pressure fluctuation of the original model. The bionic model was effectively reduced the main frequency amplitude of the pressure fluctuation at the volute tongue, the blade inlet, and the impeller channel outlet, while the disturbance of the bionic nodule flow field made the flow in the middle of the impeller channel unstable, where the main frequency amplitude of the pressure fluctuation increased significantly. The bionic model was also reduced the main frequency amplitude of pressure fluctuation at the multiple positions in the centrifugal pump. The decrease of pressure fluctuation indicated that the cavitation noise and cavitation surge were also suppressed in the centrifugal pump. The counter vortex that generated at the bionic structure was changed the impeller vorticity field for the high-intensity vorticity area in front of the bionic nodule and near the wall of the leading edge of the blade. The anti-interference performance of the blade was improved to make the cavity development more stable. The high-intensity vorticity area was also reduced at the inlet of the impeller channel for the more uniform flow in the impeller channel. The bionic model was reduced the area of the low-pressure area at the impeller inlet and the turbulent kinetic energy in the impeller passage, leading to the less cavitation and the flow loss. The bionic model can be expected to effectively inhibit the cavitation of centrifugal pump for the better performance of centrifugal pump. © 2022 Chinese Society of Agricultural Engineering. All rights reserved.
关键词	Bionics Centrifugal pumps Computational fluid dynamics Flow fields Impellers Kinetic energy Kinetics Numerical models Turbulence models Vorticity Bionic model Cavitation characteristics Cavitation performance Cavity development Humpback whales Hydraulic performance Impeller channels Main frequency Pressure fluctuation Pump models
DOI	10.11975/j.issn.1002-6819.2022.12.003
收录类别	EI
语种	中文
出版者	Chinese Society of Agricultural Engineering
EI入藏号	20224713134761
EI主题词	Cavitation
EI分类号	461.1 Biomedical Engineering ; 601.2 Machine Components ; 618.2 Pumps ; 631.1 Fluid Flow, General ; 631.1.1 Liquid Dynamics ; 723.5 Computer Applications ; 921 Mathematics ; 931 Classical Physics ; Quantum Theory ; Relativity ; 931.1 Mechanics
引用统计	无
文献类型	期刊论文
条目标识符	https://ir.lut.edu.cn/handle/2XXMBERH/160620
专题	能源与动力工程学院
作者单位	1. College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China; 2. Key Laboratory of Fluid Machinery and System, Gansu Province, Lanzhou 730050, China
第一作者单位	能源与动力工程学院
第一作者的第一单位	能源与动力工程学院
推荐引用方式 GB/T 7714	Weiguo, Zhao,Jiawei, Qin,Xiangfu, Tian,et al. Cavitation characteristics of bionic centrifugal pump based on "nodule effect" of humpback whale[J]. Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering,2022,38(12):23-31.
APA	Weiguo, Zhao,Jiawei, Qin,Xiangfu, Tian,&Tianming, Wen.(2022).Cavitation characteristics of bionic centrifugal pump based on "nodule effect" of humpback whale.Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering,38(12),23-31.
MLA	Weiguo, Zhao,et al."Cavitation characteristics of bionic centrifugal pump based on "nodule effect" of humpback whale".Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering 38.12(2022):23-31.