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Journal of Applied Fluid Mechanics، جلد ۱۷، شماره ۳، صفحات ۶۴۶-۶۵۷
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عنوان انگلیسی Research on the Unsteady Flow and Vortex Characteristics of Cavitation at the Tongue in Centrifugal Pump
چکیده انگلیسی مقاله In order to study the unsteady flow and vortex characteristics of tongue cavitation, numerical calculation is carried out for the whole flow channel given different conditions. Then, the calculation results are verified experimentally. The results show that after the occurrence of tongue cavitation in the centrifugal pump, it deteriorates with the decrease of NPSHa. However, when NPSHa is reduced to 3.78 m, it does not change significantly anymore with the decrease of NPSHa. The extrusion of fluid by the vapor at the tongue promotes the formation of the separation vortex, and the re-jet flow caused by the separation vortex leads to vapor shedding. The frequency of cavitation shedding is consistent with the frequency of vortex shedding. In the vorticity transport equation, the relative vortex stretching term and the relative vortex dilatation term dominate the vapor shedding by controlling the change in vorticity. The baroclinic torque term mainly affects the change of vorticity at the vapor-liquid interface, but to a much lesser extent than the first two terms.
کلیدواژه‌های انگلیسی مقاله Centrifugal pump, Tongue cavitation, Vortex, Vorticity transport equation, Stability
نویسندگان مقاله Z. Y. Luo |
Chengdu Fluid Dynamics Innovation Center, Chengdu, 610071, China

Y. Feng |
Chengdu Fluid Dynamics Innovation Center, Chengdu, 610071, China

X. Y. Sun |
Chengdu Fluid Dynamics Innovation Center, Chengdu, 610071, China

Y. Gong |
Key Laboratory of Fluid and Power Machinery, Ministry of Education, Xihua University, Chengdu, 610039, China

J. X. Lu |
Key Laboratory of Fluid and Power Machinery, Ministry of Education, Xihua University, Chengdu, 610039, China

X. W. Zhang |
College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, 730050, China

نشانی اینترنتی https://www.jafmonline.net/article_2371_2a9c58f278bccdb76e12640df8fc5088.pdf
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