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  4. Vol 11, Issue 1, 2026

Numerical Study of Internal Flow and Leakage Characteristics in an Ω-Type Twin-Screw Pump

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DOI: 10.23977/jemm.2026.110119 | Downloads: 1 | Views: 64

Author(s)

Jing Zhou 1, Yong Cao 1

Affiliation(s)

1 School of Mechanical Engineering, Tianjin University of Science & Technology, Tianjin, 300457, China

Corresponding Author

Jing Zhou

ABSTRACT

To investigate the internal flow and leakage characteristics of an Ω-type twin-screw pump, a three-dimensional transient numerical model was established to analyze the pressure field, velocity field, and operational performance under reference conditions. The study also examined the effects of rotational speed, radial clearance, and circumferential clearance on flow rate, leakage, volumetric efficiency, and shaft power under different viscosity conditions. The results indicate that the pressure inside the pump increases in a stepwise manner along the axial direction, rising from 98.328 kPa to 557.143 kPa; the velocity field exhibits a distribution characterized by "high in the middle and low at both ends," with the maximum velocity in the central meshing zone reaching 9.31 m/s, making it the primary region for leakage and energy loss. As the rotational speed increases, the flow rate and volumetric efficiency increase, while the shaft power rises; as the radial and circumferential clearances increase, the flow rate and volumetric efficiency decrease, and the leakage volume increases. Low-viscosity media are more sensitive to changes in clearances, and the effect of circumferential clearance is more significant than that of radial clearance. The research results can provide a reference for the structural optimization and operating condition matching of twin-screw pumps.

KEYWORDS

Twin-screw pump; Numerical simulation; Leakage characteristic; Radial clearance; Circumferential clearance

CITE THIS PAPER

Jing Zhou, Yong Cao. Numerical Study of Internal Flow and Leakage Characteristics in an Ω-Type Twin-Screw Pump. Journal of Engineering Mechanics and Machinery (2026). Vol. 11, No. 1, 205-217. DOI: http://dx.doi.org/10.23977/jemm.2026.110119.

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