Shape and Position of Sliding Interface for Transient Flow Simulation of Centrifugal Pump

WANG Chaoyue, WANG Fujun

Abstract

Sliding mesh method is one of the most important methods for analyzing transient rotor-stator coupling of centrifugal pump. The shape and position of sliding mesh interface have direct impacts on the calculation results of transient flow field. However, until now there was no uniform view on how to select the sliding mesh interface. A centrifugal pump was taken as study object. Five different sliding mesh interface schemes were used to simulate the transient flow field. Results showed that the average simulation errors of pump efficiencies for scheme I (i.e., the short line-shaped interface close to impeller outlet) and scheme V (i.e., the inverted U-shaped interface surrounding impeller) were both about 1%. The streamlines in meridian plane and velocities in volute inlet for both schemes were in line with existed experimental results. Specially, the scheme V can give more reasonable gradient of velocity in pump chamber, and gain right results of pressure fluctuation in tongue area. Both scheme ? (i.e., the long line-shaped interface close to impeller outlet) and scheme ? (i.e., the long line-shaped interface close to base circle of spiral casing) set the pump chamber to a rotating domain, and gave the simulation errors of pump efficiency as 5.2% and 9.2%, respectively, which also resulted in incorrect streamlines in meridian plane. Both scheme ? and scheme ? (i.e., the short line-shaped interface close to base circle of volute casing) set the rotating domain close to tongue, and caused shearing action of tongue to be enlarged. The inlet velocities in tongue area were decreased seriously. In summary, the schemes that made the entire pump chamber into rotating domain or made the interface close to the tongue would make the simulation results unreasonable. The scheme taking the inverted U-shaped interface surrounding impeller as interface was suggested. This scheme can guarantee the simulation accuracy and reflect the real characteristics of the flow field.

 

Keywords: centrifugal pump, sliding mesh method, sliding interface, transient analysis

 

Download Full Text:

PDF


References


2009, 25(6) :115 - 119. ZHAO Binjuan,YUAN Shouqi,CHEN lluilong. Unsteady flow characteristics in double-channel pumps based on sliding mesh [J]. Transactions of the CSAE, 2009,25(6): 115 - 119. (in Chinese)

ANSYS Inc. ANSYS fluent theory guide ANSYS fluent release 16. 0[M]. ANSYS Inc. , 2015.

BOTHE F, FRIEBE C, HEINRICH M, et al. CFD simulation of incompressible turbomachinery—a comparison of results from ANSYS Fluent and OpenFORA [ С ] // ASME Turbo Expo 2014: Turbine Technical Conference and Exposition, 2014, 2B: V02BT39 A025.

YAO Zhifeng,WANG Fujun,QU Lixia,et al. Experimental investigation of time-frequency characteristics of pressure fluctuations in a double-suction centrifugal pump [J]. Journal of Fluid Engineering, 2011 , 133( 10) ; 101303.

ZHANG Laiping, DENG Xiaogang, ZHANG Hanxin. Reviews of moving grid generation techniques and numerical methods for unsteady flow[J]. Advances in Mechanics, 2010, 40(4) ;424 -447. (in Chinese)

ZHANG Lingxin,HU Longbing,SHAO Xueming. Computation of unsteady (low fields in a pump using sliding mesh methods [J ]. HUANG Si, YANG Fuxiang, GUO Jing, et al. Numerical simulation of 31) unsteady flow in centrifugal pump by dynamic mesh technique[ J ]. Science & Technology Review, 2013, 31(24) ;33 -36. (in Chinese)

http: // www. j-csam. org/jcsam/ch/reader/view_abstract. aspx? file_no = 20160345 & flag = 1. DOI; 10. 6041/j. issn. 1000-1298. 2016.03.045. DL ND 'Гао,Sill Zhengxiang,YANG Jianbao,et al. Optimization of diffuser parameters of mixing flow fans in open dairy house[ J/OL]. Transactions of the Chinese Society lor Agricultural Machinery, 2016, 47(3) ;319 -327. ( in Chinese)

ZHANG Man, LI Sheng. Based on sliding gird to calculate the hydrodynamic performance of propeller [ J ] . Ship & Ocean Engineering, 2013 , 42( 5 ) ;25 - 29. ( in Chinese)

ZHANG Ning, ZHANG Peng, WU Jihao, et al. Numerical study of unsteady flow in centrifugal cold compressor [ С ] // 25th International Cryogenic Engineering Conference and the International Cryogenic Materials Conference in 2014, ICEC 25 – ICMC 2014.

TRIVEDI C, CERVANTES M J, DAHLHAUG 0 G. Experimental and numerical studies of a high-head francis turbine: a review of the francis-99 test case[J]. Energies, 2016, 9(2) : 1 -24.

TERAN L A, LARRAHONDO F J, RODRfGUEZ S A. Performance improvement of a 500-kW Francis turbine based on CFD [J]. Renewable Energy, 2016, 96 :977 -992.

W ANG Wenquan,HAO Dongwei, ZHANG Lixiang. Effects of sliding mesh interface position on swirling How fields in impeller machinery [ J ]. Transactions of Beijing Institute of Technology, 2012, 32(9) ;890 -894. (in Chinese)

http://www.j-csam.org/ jcsam/ch/reader/view_abstract. aspx? file_no = 20160201 & flag = 1. DOI; 10. 6041/j. issn. 1000-1298.2016.02.001. WANG Fujun. Research progress of computational model for rotating turbulent How in fluid machinery [ J/OL]. Transactions of the Chinese Society for Agricultural Machinery, 2016, 47(2) ;1 - 14. (in Chinese)

MENTER F R. Two-equation eddy-viscositv turbulence models for engineering applications [ J ]. AIAA Journal, 1994 , 32(8); 1598 - 1605.

ANSYS Inc. ANSYS CFX Solver theory guide ANSYS CFX Release 16. 0[ М]. ANSYS Inc. , 2015.

STEPANOFF A J. Centrifugal and axial How pumps theory design and application[ М]. New York; John Wiley and Sons, 1957.

YUAN Shouqi,YONG Yan,YUAN Jianping. Unsteady turbulent timulation and pressure fluctuation analysis for centrifugal pumps [J]. Cl. inese Journal of Mechanical Engineering, 2009, 22( 1 ) ;64 -69.


Refbacks

  • There are currently no refbacks.