Investigation of a novel circular arc claw rotor profile for claw vacuum pumps and its performance analysis

Wang, Jun; Jiang, Xitong; Cai, Yuyang

doi:10.1016/j.vacuum.2014.10.003

Cited by 26 publications

(6 citation statements)

References 7 publications

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“…Giuffrida [6] proposed a geometric model of a claw rotor, in which the straight line, circular arc were adopted to modify unsmooth points at addendum and dedendum arcs of rotor profiles in claw rotors. Wang [7] adopted a circular arc and an equidistant curve of a cycloid to modify non-smooth connection points of claw rotor. With regard to numerical simulations of claw pumps.…”

Section: Introductionmentioning

confidence: 99%

Pressurization process and performance analysis of gear-claw hydrogen circulating pump used in PEMFC system

Pan,

Wang,

Zhao

et al. 2024

J. Phys.: Conf. Ser.

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Owing to the structure of the gear-claw rotor, working chambers of claw pumps are divided into small multi-chambers by a pair of intermeshing claw rotors in the mixing process, and the transient flow in multi-chambers is complicated, which results in the increase of the pump consumption. Hence, it is necessary to study the transient flow and working process of gear-claw hydrogen circulating pumps to optimize the pump performance. In this study, the meshing model of a high-order curve and its conjugate curve was proposed, and the profile composition of the gear-claw rotor was introduced. The influence of the radius ratio of claw addendum arc on the performance including relative carryover, built-in volume ratio and volume utilization was analyzed. The flow field of gear-claw hydrogen circulating pump including pressure and velocity field was analyzed by using numerical simulations. Furthermore, the p-V diagram of pumps was obtained. It is found that the gas in the compression chamber is mixed with the gas in the carryover, and the initial pressure in the compression chamber is 130.78kPa, which increases by 29.07% compared to the original initial pressure in the compression chamber. Therefore, an overcompression phenomenon at the end of the compression process (at the beginning of the discharge process) occurs.

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Section: Introductionmentioning

confidence: 99%

Pressurization process and performance analysis of gear-claw hydrogen circulating pump used in PEMFC system

Pan,

Wang,

Zhao

et al. 2024

J. Phys.: Conf. Ser.

Self Cite

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“…However, few relevant publications have reported on the internal working process of Roots compressors for this special application except for one primary simulation work by the authors. 4 A majority of research on Roots-type machine primarily focused on Roots blower or Roots vacuum pump with respect to the rotor profile, 5,6 thermodynamic performance 7,8 and flow field simulation in chamber. 9,10 Nevertheless, these studies provided valuable suggestions and references for the development and improvement of Roots compressors for air supply in fuel cell systems.…”

Section: Introductionmentioning

confidence: 99%

3D transient numerical simulation of a helical roots air compressor for FCVs

Wei

Wang

Feng

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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Oil-free helical Roots air compressors which have great application potential in air circulation systems for high-power fuel cell systems, such as commercial fuel cell vehicles (FCVs), have the advantages of active adaptation, low cost, large flow rate and high reliability. In this study, a three-dimensional transient numerical simulation model of a helical Roots air compressor was established by considering all leakage clearances. In this study, hexahedral structured dynamic grids were generated in the working chamber and the rotating angle was updated at an increment of 1° to ensure the mesh quality of the entire solving domain. The accuracy of the simulation model was validated using experimental data, and the maximum deviation was less than 4.0%. Based on the simulated results, the pressure field and variation of the pressure field with the rotation angle are presented. It shows that the pressure fluctuation at the discharge side was larger than that at the suction side. The influence of various leakage clearance on the volumetric efficiency was analyzed comparatively. Additionally, the flow field characteristic of clearance was revealed. It is found that the rotor tip clearance was the major factor for the reduction of volumetric efficiency when the size was larger than 0.12 mm instead of the interlobe clearance. It is suggested that more attention should be paid to control the clearance size to ensure the performance of helical Roots air compressors.

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“…A dimensionless flow rate expression called 'specific flow rate' is used in the lobe pump. Wang, Jiang, and Cai (2015) proposed a novel circular arc claw rotor profile, the gas flow in the claw vacuum pump was simulated numerically and the pressure distribution which is caused by claw rotors' gas pressure was calculated carefully. The flow of the involute leaf lobe pump is a periodic parabolic function (Mimmi & Pennacchi, 1994).…”

Section: Introductionmentioning

confidence: 99%

Mitigation of radial exciting force of rotary lobe pump by gradually varied gap

Guo

Li³

2018

Engineering Applications of Computational Fluid Mechanics

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This paper presents a new structure of a rotary lobe pump cavity with gradually varied gap to mitigate the magnitude and fluctuation of the radial exciting force on the rotor. The geometry of the rotary lobe pump cavity is specially designed, so that the gap between the rotor and cavity is gradually changed during the rotors' engaging. The flow in this geometry is numerically studied, and its effect on the pressure pulsation and radial exciting force is analysed, based on the dynamic mesh and local mesh reconstruction. Also, the mechanism of the mitigation of radial exciting force is briefly discussed. The value of the gap is an addition of gradually varied gap r (0 ∼ r max) and the base gap (original constant gap: 0.2 mm). As for the results, it is found that as the varied gap r max value increases, the intensity of the reverse rotating vortex at the outlet decreases, and the secondary flow pulsation of the outlet section is effectively weakened. When r max = 0.1 mm, the radial exciting force in the y-direction on the rotor is reduced by 12% comparing with the equal gap, and the radial exciting force pulsation coefficient is 0.31. Meanwhile, the radial exciting force in the x-direction is reduced by 19% accordingly. The gradually varied gap cavity can effectively reduce the peak value of the pressure pulsation at outlet, weakening the influence of the rapid change of the outlet pressure on the radial exciting force. It is found that an optimal r max of 0.1 ∼ 0.15 mm has a remarkable effect on the mitigation of pressure pulsation and radial exciting force.

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Investigation of a novel circular arc claw rotor profile for claw vacuum pumps and its performance analysis

Cited by 26 publications

References 7 publications

Pressurization process and performance analysis of gear-claw hydrogen circulating pump used in PEMFC system

Pressurization process and performance analysis of gear-claw hydrogen circulating pump used in PEMFC system

3D transient numerical simulation of a helical roots air compressor for FCVs

Mitigation of radial exciting force of rotary lobe pump by gradually varied gap

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