Dynamic mesh simulation and analysis for inner flow field of cam pump
1.School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China; 2.School of Mechanical and Electrical Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China; 3.Jinan UK Metering Flow Machinery Co., Ltd., Jinan, Shandong 250021, China
Abstract： According to the meshing characteristics of cam pump rotors, the involute profile equation was established to show that when the pressure angle α of profile equation was from 40° to 50°, the conjugate rotors did not produce interference effects during relative motions. To clarify the effects of pressure angle on geometric parameters of cam pump rotor profile equation, based on the dynamic grid model of Fluent software and the grid deformation technique of reconstruction of local grid, the RNG k-ε turbulence model and the PISO algorithm were used to realize dynamic grid numerical analysis of the internal flow field of rotor cavity of the cam pump. Monitoring pulsations of outlet flow and inlet pressure quantitatively, the transient characteristics of flow pulsation and pressure pulsation were achieved under the conditions of different pressure angles and flow. The simulation results show that the outlet flow and the inlet pressure of cam pump present periodic fluctuations. As the pressure angle of cam pump rotors increases gradually, both the outlet flow and the inlet pressure show reduction tendency. The rotational speed is the main impacting factor on the period of fluctuations and the pulsation phenomenon. With the increase of rotational speed, the outlet flow and the inlet pressure increase significantly, and the phenomenon of pulsation is more obvious. When the rotational speed increases to a certain degree, the inlet pressure and the outlet speed increase slightly, and the pulsation phenomenon is more severe.
2014, Vol. 35 
