Computational fluid dynamics simulation study of gas flow in dry scroll vacuum pump

Yue, Xiang-Ji; Lü, Yanjun; Zhang, Yingli; Ba, Dechun; Wang, Guangyu; Zhang, Zhen-hou

doi:10.1016/j.vacuum.2015.03.012

Cited by 29 publications

(9 citation statements)

References 11 publications

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“…Yue et al simulated the working process of single-stage and two-stage scroll vacuum pumps, respectively. Additionally, they found that compression and overcompression would lead to significant gas pressure variation and violent compression torque pulsation [22,23]. Wang et al optimized the profile of the asynchronous suction Additionally, an optimization scheme was conceived to improve the cavitation phenomenon and working performance of the pump [4,5].…”

Section: Introductionmentioning

confidence: 99%

Internal Flow and Cavitation Analysis of Scroll Oil Pump by CFD Method

et al. 2021

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In this study, a three-dimensional model with actual clearances was established for a scroll oil pump, and the internal flow was simulated by the CFD method. The internal flows at different rotation angles were studied, and the cavitation and pressure pulsation in the scroll pump under different working conditions were analyzed. The results show that the flow in the two working chambers of the scroll pump is asymmetric due to its structural characteristics and motion mode. The high-pressure pulsation occurs in the working chamber during the end of the suction and the beginning of discharge. Under the action of high-pressure difference, there is a high-speed jet in the clearance between the orbiting and fixed scrolls, which causes a large area of cavitation downstream of the clearance. Under a low suction pressure, cavitation intensifies with the increase in rotating speed, which leads to a decrease in volumetric efficiency. It can effectively improve cavitation by increasing the suction pressure and volumetric efficiency of the pump. The pressure pulsation can be effectively improved by increasing the axial clearance and reducing the rotating speed. The method of reducing pressure pulsation by shortening the scroll profile is proposed.

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Section: Introductionmentioning

confidence: 99%

Internal Flow and Cavitation Analysis of Scroll Oil Pump by CFD Method

et al. 2021

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“…set up a simulation model under different working conditions, namely under compression, slightly over compression, and over compression, and the result demonstrate the pressure change process inside the pump. 8 A screw grinding process based on computer numeric controlled machine tool was proposed by Zhao et al., 9 in which the screw rotor profile errors can be controlled within ±10 μm. A variable cross-section profile is put forward by Wang et al.…”

Section: Introductionmentioning

confidence: 99%

Design and experimental analysis of end face profile of tri-screw pump

Dong

Zhao

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part A:

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This study proposes a new type of tri-screw pump, which has a 1:2:3 ratio of the active diameter of the screw, the diameter of the pitch circle, and the top diameter of the active screw. Fixed width correction method of the driven screw is also proposed to avoid wear of tooth top. The mathematical model of active and driven screws is established. To avoid the wear of the tooth top arc, several transition patterns are proposed, and the transition curve in the form of a circular arc is deduced. The designed screw curve is grinded, and the tri-screw pump is assembled. The hydraulic pump test bench is tested using the overflow valve to perform pressure loading of 3–5 MPa on the outlet of the screw pump. The outlet flow rate and pressure are tested, and results indicate that the output flow of the pump conforms to the designed flow rate. This study establishes the detailed equation of the end face profile of the tri-screw pump (active and driven screws) and corrects the arc profile of the line angle.

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“…Yue et al [5] established the transient model of the scroll vacuum pump on the basis of dynamic mesh technology with the fluent code; three cases including under-compression, slight over-compression and over-compression were calculated and compared with the experimental results; the maximum error reached 30%. Hesse and Andres [6] used…”

Section: Introductionmentioning

confidence: 99%

“…Wang et al [4] designed a multiphase scroll pump and analyzed the effects of gas volume fraction and rotation speed on the performance of scroll pump using the CFD method. Yue et al [5] established the transient model of the scroll vacuum pump on the basis of dynamic mesh technology with the fluent code; three cases including under-compression, slight over-compression and over-compression were calculated and compared with the experimental results; the maximum error reached 30%. Hesse and Andres [6] the Twinmesh and CFX to simulate the scroll vane pump with leakage transiently; the results indicated that the simulation can capture the working mechanism and flow conditions in the dry scroll vacuum pump.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of the transient flow in a scroll refrigeration compressor

Sun

Guo

et al. 2017

IOP Conf. Ser.: Mater. Sci. Eng.

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Calculation procedures for oil free scroll compressors based on mathematical modelling of working process Y Paranin, A Burmistrov, S Salikeev et al. Abstract. In the present paper, the CFD technology is adopted to simulate the working process of a scroll refrigeration compressor with R22 as working fluid. The structural grids in the scroll compressor were updated continually during the solving process to cope with the movement boundaries of the fluid domain. The radial meshing clearance was 0.008 mm which was the same with that in the real prototype. The pressure, velocity and temperature distribution in chambers of compressor were computed. Also, the transient mass flux diagrams were calculated out. The results indicated that the pressure was asymmetrical in the two symmetrical suction chambers, because the suction port and passage were not absolutely symmetrical. The gradient of temperature was great in each working chamber due to leakage flow. Velocity vector distribution was asymmetrical in each pair of working chamber owing to the movement of orbiting scroll; the flow was complicated in the central working chamber. The movement of the orbiting scroll had different influence on the vortexes formation in each pair of compression chamber. The inlet and outlet mass flux fluctuated with the crank angle obviously. Because of the 'cut-off' of the refrigeration fluid in the suction chamber when the crank angle was larger than 220°, the inlet mass flux decreased remarkably. Finally, some useful advices were given to improve the performance of the scroll refrigeration compressor. IntroductionScroll compressors were widely used in small refrigeration systems and air conditioners, and it has become one of the most common used refrigeration compressors. The investigation of scroll compressors was essential to improve its performance. In recent years, computational fluid dynamics (CFD) technology has gradually become a reliable means to analyze working process of the scroll refrigeration compressor. Cui [1] simulated the three dimensional transient flow in a scroll refrigeration compressor and found that the mass, velocity, pressure, and temperature were asymmetric in each pair of working chamber. Furthermore, the CFD method has been used to simulate the suction process [2] and the discharge process [3] to study the fundamental mechanism of them, and supposed the optimum proposal. Wang et al.[4] designed a multiphase scroll pump and analyzed the effects of gas volume fraction and rotation speed on the performance of scroll pump using the CFD method. Yue et al. [5] established the transient model of the scroll vacuum pump on the basis of dynamic mesh technology with the fluent code; three cases including under-compression, slight over-compression and over-compression were calculated and compared with the experimental results; the maximum error reached 30%. Hesse and Andres [6] used

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Computational fluid dynamics simulation study of gas flow in dry scroll vacuum pump

Cited by 29 publications

References 11 publications

Internal Flow and Cavitation Analysis of Scroll Oil Pump by CFD Method

Internal Flow and Cavitation Analysis of Scroll Oil Pump by CFD Method

Design and experimental analysis of end face profile of tri-screw pump

Numerical analysis of the transient flow in a scroll refrigeration compressor

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