Experimental Study of Oil‐Free Claw Vacuum Pump Characteristics

Raykov, A.; Salikeev, S.; Бурмистров, А. В.; Fomina, M.

doi:10.1002/vipr.201600607

Cited by 14 publications

(2 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The quality can be further improved by smoothing the numerical mesh. The transfinite interpolation used for distributing internal points is fully described in [2] and [22]. A series of 2D numerical meshes are generated in the planes normal to each of the rotors' helix lines.…”

Section: Distribution Of the Internal Nodes In 2d Planesmentioning

confidence: 99%

“…The first vacuum dry pumps based on the roots principle were introduced in 1984 in Japan [1]. Nowadays, the vacuum pumps are widely used in many different industries such as nanotechnology, microelectronics, medicine, pharmaceuticals, thermonuclear power, food and packaging industry and others [2]. The semiconductor industry is one of the largest and most rapidly developing markets for twin-screw vacuum pumps.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical Study of Customised Mesh for Twin Screw Vacuum Pumps

Kovačević

Read

et al. 2019

Designs

View full text Add to dashboard Cite

The market for dry vacuum pumps is expected to increase in the coming years. Improving the efficiency of these machines requires comprehensive understanding of the flow dynamics within the working chambers. For this purpose, Computational Fluid Dynamics (CFD) is used as it offers better insight of the working process of a screw machine. In this study, a twin-screw vacuum pump with a large helix angle was analysed. This is a challenging case for CFD due to the limitations of grid generation in the transverse plane on the mesh quality. Two types of transverse meshes were generated using the software SCORGTM: casing to rotor non-conformal mesh and casing to rotor conformal mesh. The quality of the mesh in terms of aspect ratio and orthogonality were compared. The casing to rotor conformal mesh was used with ANSYS Fluent in order to obtain performance characteristics of the vacuum pump with the moderate helix angle of 62° such as the mass flow rate, rotor torque, and indicated power. The performance prediction results were satisfactory but the grid quality was relatively low with orthogonality reaching 40° and aspect ratio over 250 in some cases. As the helix angle increases the quality of mesh decreases. This paper presents the new development of a grid generation algorithm which uses the normal rack to map the fluid domain in the normal plane instead of the transverse plane. This new mesh generation method is expected to better align the computational grid with the main and leakage flows in order to significantly improve grid quality and reduce the numerical diffusion in case of screw machines with large helix angles.

show abstract

Section: Distribution Of the Internal Nodes In 2d Planesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Study of Customised Mesh for Twin Screw Vacuum Pumps

Kovačević

Read

et al. 2019

Designs

View full text Add to dashboard Cite

show abstract

Mathematical model of working process of oil free scroll vacuum pump

Бурмистров¹,

Salikeev²,

Raykov³

et al. 2017

Vak Forsch Prax

View full text Add to dashboard Cite

Summary A mathematical model of oil free scroll machine working in vacuum conditions is considered. Differential equations and main assumptions in the model are presented. Four types of control volumes are specified. The model takes into consideration heat exchange between the pump working elements, change of clearances due to thermal deformations, and mobility of the scroll element wall in calculation of leakage. The comparison of the calculated values of the pumping speed with experimental values obtained at different rotation speed of the driveshaft is carried out.

show abstract