Effect of Surface-fitted Obstacle in Centrifugal Pump on Cavitation Suppression

doi:10.6041/j.issn.1000-1298.2017.09.014

	Effect of Surface-fitted Obstacle in Centrifugal Pump on Cavitation Suppression
	Zhao, Weiguo 1,2; Zhao, Guoshou 1; Xian, Lixia 1; Han, Xiangdong 1
刊名	Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery
	2017-09-25
卷号	48 期号:9 页码:111-120
关键词	Cavitation Centrifugal pumps Computer simulation Deterioration Kinetic energy Kinetics Turbulence models Vortex flow Cavitation number Different stages K-Omega turbulence model Obstacle Petrochemical industry Pressure frequency Turbulent kinetic energy Unsteady cavitation
ISSN号	10001298
DOI	10.6041/j.issn.1000-1298.2017.09.014
英文摘要	Centrifugal pumps are widely used to deliver liquid media in agriculture, pharmacy, industry, petrochemical industry, etc. Compared with the case delivering pure liquid such as water, centrifugal pumps not only have lower efficiency but also are subject to severe vibration, noise and erosion when delivering cavity two-phase flow, leading to the deterioration of flow field and even the shortage of service life. The cavitation flow in centrifugal pump performs strong instabilities, thus a method of a tiny obstacle fitted on the blade surface was proposed to suppress the cavitation development on a ns=32 model pump. The unsteady cavitation flow varied with cavitation number in centrifugal pump was simulated by modified SST k-ω turbulence model combined with Kubota cavitation model. The results showed that the head of centrifugal pump with obstacle was decreased within 5% at various flow rate and within 3% at design point, the efficiency was decreased within 3% at various flow rate and 1.2% at design point, the head with obstacle was great improved when cavitation flow developed. The obstacle can enhance the turbulent kinetic energy near the blade wall and reset the absolute pressure distribution, which can suppress the cavitation at different stages in centrifugal pump. The obstacle can optimize the flow structure and degrade the vortex intensity near the suction side of blade especially the area close to the tongue. The obstacle can decrease the cavity volume at varied cavitation number and the cavity volume keep attenuating when cavitation developed. The obstacle can cause small magnitude of the disturbance on the pressure frequency spectrum. The effects of cavitation suppression were optimal when the bubbles reached close to the obstacle. © 2017, Chinese Society of Agricultural Machinery. All right reserved.
语种	中文
出版者	Chinese Society of Agricultural Machinery
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/114103]
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 University of Technology, Lanzhou; 730050, China
推荐引用方式 GB/T 7714	Zhao, Weiguo,Zhao, Guoshou,Xian, Lixia,et al. Effect of Surface-fitted Obstacle in Centrifugal Pump on Cavitation Suppression[J]. Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery,2017,48(9):111-120.
APA	Zhao, Weiguo,Zhao, Guoshou,Xian, Lixia,&Han, Xiangdong.(2017).Effect of Surface-fitted Obstacle in Centrifugal Pump on Cavitation Suppression.Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery,48(9),111-120.
MLA	Zhao, Weiguo,et al."Effect of Surface-fitted Obstacle in Centrifugal Pump on Cavitation Suppression".Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery 48.9(2017):111-120.