In order to study the effect of the transmission medium viscosity on lobe pump efficiency, the 3D modeling software was used to build parametric models of the lobe pump. The size function was applied to mesh the lobe pump model and the grid near the rotors was refined. On the computational fluid dynamics software platform, the numerical simulation of lobe pump was performed with RNG k-ε turbulence mode and dynamic mesh technique. By comparing the lobe pump efficiencies with diffe-rent transmission media, the impact of medium viscosity on the lobe pump efficiency was revealed. The results show that when the pressure differential is increased from 0.1 MPa to 0.6 MPa, the volumetric efficiency corresponding to each viscosity of the medium is decreased, but the medium with larger viscosity(>250 cP)is less sensitive to pressure differential. When pressure differential is constant and rotation speed is increased from 200 r/min to 600 r/min, volumetric efficiency of low-viscosity fluid medium(<100 cP)has been significantly improved, and the high-viscosity fluid medium changes only slightly. Along with the increase of medium viscosity, the rotation speed for the maximum efficiency of lobe pump decreases. This paper has reference value for a reasonable selection of lobe pump in different operational conditions and improvement of lobe pump efficiency.
LI Die,JIANG Xiao-Jun,QIAN Hao-Hai. Numerical investigation of viscosity impact on rotary lobe pump performance[J]. Journal of Drainage and Irrigation Machinery Engin, 2014, 32(8): 669-673.
Kang Y H, Vu H H,Hsu C H. Factors impacting on performance of lobe pumps: A numerical evaluation [J]. Journal of Mechanics, 2012, 28(2):229-338.
Mahesh Prakash, Nick Stokes. SPH simulations of a lobe pump: Prediction of protein shear [C]//Third International Conference on CFD in the Minerals and Process Industries CSIRO. Melbourne:[s.n.],2003:183-188.
Ye Xiaoyan, Shi Haixia,Hu Jingning, et al. Optimization selection of gap between rotor and pump body of external circulation rotor pump[J]. Transactions of the Chinese Society for Agricultural Machinery,2007,38(4):81-84.(in Chinese)
Zhang Hongxin, Zhang Tiezhu, Zhang Jizhong,et al. Research on design and test of an un-contact rotor pump[J]. Transaction of the Chinese Society for Agricultural Machinery, 2005,36(7):65-67.(in Chinese)