Performance analysis of embedded tri-screw pump based on computational fluid dynamics

Abstract

To meet the stringent size and noise requirements for hydraulic pumps used in submarines, an embedded tri-screw pump is proposed. The pump is embedded in the core of the servo motor to form a new servo motor pump. This paper first presents the embedded triscrew pump, as well as the cross-section profile design and parameter equations of the driving and driven screws. Velocity and pressure field distributions as well as changes in internal pressure and shear stress inside the embedded tri-screw pump with different radial and interlobe clearances were investigated using computational fluid dynamics. Furthermore, screw deformation under multi-field coupling was analyzed. In contrast to torque or fluid pressure acting alone, under the fluid-solid coupling effect, screw deformation and stresses are inversely proportional to the rotational speed of the pump and directly proportional to the power and output pressure. The simulation and experimental results were consistent for various outlet pressures and rotational speeds. Radial clearance of the screw has a more significant influence on leakage than inter-lobe clearance and therefore, more impact on the volumetric efficiency of the pump.

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Abbreviations

d j :

Pitch circle diameter of driving and driven screws

R st :

The root circle coefficient of driven screw

R mt :

The tooth top circle coefficient of the driving screw

x f, y f :

The intersection of bc and de

x m, y m :

The intersection of b’c’ and d’e’

t :

The angle parameter

ρ :

The density

▽:

The Hamiltonian operator

μ, v, w :

The components of velocity u in the x, y, and z directions

p :

The static pressure

S μ, Sv, Sw :

The components of stress in the x, y, and z directions

ϑ:

The kinematic viscosity

ω 1, ω 2 :

The angular velocities of the driving and driven screws

v x, v y, v z :

The components of velocity in the x, y, and z directions

A 1 :

Flow area A1

A 2 :

The area of the three holes on the end face of the pump body

A 3 :

The end area of the driving screw

A 4 :

The end area of the driven screw

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Acknowledgments

The author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: This work was supported by the Natural Science Foundation of Shaanxi Province of China (Grant No. 2019JM-466), and Talent Launch Plan Project of Shaanxi University of Technology (Grant No. SLGQD1811).

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Correspondence to Hongling Hou.

Additional information

Yongqiang Zhao received his B.S. degree from Shaanxi University of Technology, China, in 2000, and his M.S. and Ph.D. degrees from School of Mechanical Engineering, Xi’an Jiaotong University, China, in 2007 and 2017, respectively. He is currently a Professor at School of Mechanical Engineering, Shaanxi University of Technology, China. His research interests are in fluid transmission and control, special manufacturing process and equipment, computer control of mechanical-electrical-hydraulic system, etc.

Bowen Zhu received his B.S. degree from Chongqing University of Arts and Science, China, in 2018. He is currently a student and studying for a M.S. degree at School of Mechanical Engineering, Shaanxi University of Technology, China. His research interests are in fluid transmission and control, and computer control of mechanical-electrical-hydraulic system, etc.

Hongling Hou received her B.S. degree from Shaanxi University of Technology, China, in 2000, and her M.S. degree from Xi’an Jiaotong University, China, in 2006. She is currently an Associate Professor at School of Mechanical Engineering, Shaanxi University of Technology, China. Her research interests are in advanced manufacturing technology and equipment, fluid transmission and control, etc.

Shengdun Zhao received his B.S., M.S. and Ph.D. from Xi’an Jiaotong University, China, in 1983, 1986 and 1997, respectively. His currently a Professor at School of Mechanical Engineering, Xi’an Jiaotong University, China. His research interests are in plastic forming technology and equipment, computer control of mechanical-electrical-hydraulic system, fluid transmission and control, etc.

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Zhao, Y., Zhu, B., Hou, H. et al. Performance analysis of embedded tri-screw pump based on computational fluid dynamics. J Mech Sci Technol 35, 601–614 (2021). https://doi.org/10.1007/s12206-021-0120-4

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Keywords

  • Tri-screw pump
  • Fluid-structure coupling
  • Computational fluid dynamics
  • Screw clearance
  • Numerical simulation