Abstract
In this scientific paper, numerical simulations were performed to determine the performance of a lobe pump. The analyzes were made using CFD commercial software Ansys CFX. Using the URANS method with the SST turbulence model, the system of equations governing the flow of fluid through the lobe pump has been solved. The system of equations is represented by the Navier–Stokes equations composed of the continuity, impulse and energy equations. Considering that this type of machine is a positive displacement volumetric machine for defining the computational domain for rotating parts, the TwinMesh software were used which can make structured grids for different rotor positions. Thus, two cases where examined in which the discharge pressure was imposed. In the first case the discharge absolute pressure were 1,5 bars and for the second case the absolute pressure at the outlet were 1,7 bars. The investigation resulted in the following findings: the mass flow variations on a complete rotation and the recirculation regions with the flow detachments imposed by the positions of the two rotors.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
Mimmi, G., Pennacchi, P., Mimmi, G.: Analytical model of a particular type of positive displacement blower. Proc. Inst. Mech. Eng. Part C J. Mech. Eng. Sci. 213(5), 517–526 (1999)
Wang, P.Y., Fong, Z.H., Fang, H.S.: Design constraints of five-arc Roots vacuum pumps. Proc. Inst. Mech. Eng. Part C 216(2), 225–234 (2002)
Hsieh, C.F.: A new curve for application to the rotor profile of rotary lobe pumps. Mech. Mach. Theory 87, 70–81 (2015)
Hwang, Y.W., Hsieh, C.F.: Study on high volumetric efficiency of the Roots rotor profile with variable trochoid ratio. Proc. Inst. Mech. Eng. Part C J. Mech. Eng. Sci. 220(9), 1375–1384 (2006)
Hsieh, C.F., Hwang, Y.W.: Study on the high-sealing of Roots rotor with variable trochoid ratio. J. Mech. Des. 129(12), 1278–1284 (2007)
Tong, S.H., Yang, D.C.H.: On the generation of new lobe pumps for higher pumping flow rate. Mech. Mach. Theory 35(35), 997–1012 (2000)
Yang, D.C.H., Tong, S.H.: The specific flow rate of deviation function based lobe pumps - derivation and analysis. Mech. Mach. Theory 37(10), 1025–1042 (2002)
Tong, S.H., Yang, D.C.H.: Rotor profiles synthesis for lobe pumps with given flow rate functions. J. Mech. Des. 127(2), 287–294 (2005)
Stosic, N., Smith, I.K., Kovacevic, A., et al.: Geometry of screw compressor rotors and their tools. J. Zhejiang Univ. Sci. A 12(4), 310–326 (2011)
Kovacevic, A., Smith, I.K.: The influence of rotor deflection upon screw compressor performance. Vdi Berichte 1715, 17–28 (2002)
Li, Y.B., Jia, K., Meng, Q.W., et al.: Flow simulation of the effects of pressure angle to lobe pump rotor meshing characteristics. In: International Conference on Blowers and Fans with Compressors and Wind Turbines, Materials Science and Engineering, vol. 52, no. 3, p. 032022 (2013)
Huang, Z.F., Liu, Z.X.: Numerical study of a positive displacement blower. Proc. Inst. Mech. Eng. Part C J. Mech. Eng. Sci. 223(10), 2309–2316 (2009)
Menter, F., Ferreira, J.C., Esch, T., Konno, B.: The SST turbulence model with improved wall treatment for heat transfer predictions in gas turbines. In: Proceedings of the International Gas Turbine Congress 2003, Tokyo, November 2–7, 2003
Acknowledgment
This work was carried out within “Nucleu” Program TURBO 2020, supported by the Romanian Minister of Research and Innovation, project number PN 18.10.03.01.
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2019 Springer Nature Switzerland AG
About this paper
Cite this paper
Mălăel, I., Costea, F., Drăghici, M. (2019). Flow Evaluation of the Lobe Pump Using Numerical Methods. In: Ntalianis, K., Vachtsevanos, G., Borne, P., Croitoru, A. (eds) Applied Physics, System Science and Computers III. APSAC 2018. Lecture Notes in Electrical Engineering, vol 574 . Springer, Cham. https://doi.org/10.1007/978-3-030-21507-1_42
Download citation
DOI: https://doi.org/10.1007/978-3-030-21507-1_42
Published:
Publisher Name: Springer, Cham
Print ISBN: 978-3-030-21506-4
Online ISBN: 978-3-030-21507-1
eBook Packages: Physics and AstronomyPhysics and Astronomy (R0)