论文摘要
In order to reveal the regularity of unsteady flow of centrifugal pump under different cavitation stages, a visual closed test-bed is built to collect signals such as the distribution of cavitation bubbles at the impeller inlet and external characteristics, etc. in the process of cavitation of centrifugal pumps. Combined with the shape and distribution of bubbles captured by high-speed photography, the cavitation stage of the centrifugal pump is divided. In addition, the variation of vorticity distribution, pressure pulsation and radial force of centrifugal pump under different cavitation stages are studied using the standard k-ε turbulence model and the Kunz cavitation model. Main contributions are as follows: The cavitation bubbles can absorb the energy of vortex core to a certain extent and increase the volume of vortex core. Cavitation bubbles can also block the flow-path and induce the distortion of the internal flow field, resulting in unstable pressure waves that cause a significant increase in pressure pulsation rate. Besides, with the development of cavitation, the radial force on the impeller tends to remain invariable first and then decrease, and trajectory of the radial force changes from closed to open.
论文目录
文章来源
类型: 期刊论文
作者: DONG Liang,SHANG Huanhuan,ZHAO Yuqi,LIU Houlin,DAI Cui,WANG Ying
来源: Journal of Thermal Science 2019年04期
年度: 2019
分类: 工程科技Ⅱ辑
专业: 机械工业
单位: Research Center of Fluid Machinery Engineering and Technology, Jiangsu University,School of Energy and Power Engineering, Jiangsu University
基金: supported by the National Key Research and Development Program of China(2017YFC0804107),National Natural Science Foundation of China(No.51879122,51779106,51509111),the association innovation fund of production,learning,and research(BY2016072-01),Zhenjiang key research and development plan(GY2017001,GY2018025),the Open Research Subject of Key Laboratory of Fluid and Power Machinery,Ministry of Education,Xihua University(szjj2015-017,szjj2017-094,szjj2016-068),Sichuan Provincial Key Lab of Process Equipment and Control(GK201614,GK201816),the Advanced Talent Foundation of Jiangsu University(15JDG052),a project funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD),Jiangsu top six talent summit project(GDZB-017)
分类号: TH311
页码: 608-620
总页数: 13
文件大小: 9620K
下载量: 53