Combined experimental and calculation study of conductance of Roots pump channels

Бурмистров, А. В.; Belyaev, L.A.; Ossipov, P.; Fomina, M.; Khannanov, R

doi:10.1016/s0042-207x(01)00284-6

Cited by 23 publications

(9 citation statements)

References 1 publication

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“…Pfaller et al [18] established the calculation method of chamber pressures and mass flows of dry-running screw pump, and illustrated the relationship among working chamber volumes, stage pressure rations and isentropic compression work for different suction pressures. Burmistrov et al [19] used the angular coefficients method to calculate the conductance of channels with more complicated profiles, such as in Roots pumps working in the molecular flow regime. Stosic et al [20] used the standard screw compressor design software to create a series of rotor profiles of vacuum and multiphase pumps, and carried out performances calculations on them.…”

Section: Introductionmentioning

confidence: 99%

Effects of stable clearances on backflow in the variable-pitch screw vacuum pump

Zhang

Yong-ju

Chen

2021

Mechanics & Industry

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Effects of various clearances of variable-pitch screw vacuum pump on gas backflow of internal flow field of the pump cavity is studied. The theoretical tooth surfaces of screw rotor are optimized by radial, normal equidistance modifications, and four types of stable clearances of rotor circumferential, radial, tooth shape and tooth sides are obtained. The backflow calculation model in clearances considering Couette backflow and orifice backflow is improved. The three-dimensional model of variable-pitch screw vacuum pump is designed, and the experimental prototype and test device are developed. The internal backflow of vacuum pump is analyzed by using the commercial software Ansys-Fluent® and the calculation model. The results show that the smaller the clearances, the smaller the backflow and the higher the vacuum degree. Among the four types of clearances, the circumferential clearance plays the primary roles. The backflow is directly proportional to the inlet pressure and rotating speed. Predictions are validated by the experimental data with satisfied agreement.

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Section: Introductionmentioning

confidence: 99%

Effects of stable clearances on backflow in the variable-pitch screw vacuum pump

Zhang

Yong-ju

Chen

2021

Mechanics & Industry

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“…9 The backward leakage from each of the four clearances within the Roots vacuum pump was calculated with experimental validation, and the results enabled the optimum rotor profiles to be developed. 10…”

Section: Introductionmentioning

confidence: 99%

Performance improvement of a large capacity Roots blower based on profile modification

Feng

Tang

Peng

2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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Roots blowers are widely used in various fields, and their performances are extremely important for their application in the chemical industry. In this study, a Roots blower with a flow capacity of 90 m3/min was investigated using a computation fluid dynamics (CFD) approach, with emphasis on its performance. A previous-generation blower comprising two lobes was simulated, and the calculated volumetric efficiencies were compared with experimental data. After validating the CFD model, the performance of a Roots blower with two to six lobes was predicted. The effect of the sealing angle at the tip of the profile on the performance of the blower was also investigated. An optimized profile with three lobes and a sealing angle of 4° was selected. A new-generation Roots blower with the same capacity as that of the previous-generation was manufactured and tested. The volumetric efficiency improvements of 12.1%–18.2% could be achieved by profile optimization.

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“…Hwang and Hsieh (2006) and Hsieh and Hwang (2007) designed smooth trochoid ratio profiles by high-order polynomials which improved the sealing performance and volumetric efficiency of the Roots blower. Burmistrov, Belyaev, Ossipov, Fomina, and Khannanov (2001) proposed an angularcoefficient method for calculating the channel conductance in Roots blowers. Yao, Ye, Dai, and Cai (2005) proposed a new type profile which could create a higher air flow and a lower peak of the blower pressure compared to the conventional straight tooth.…”

Section: Introductionmentioning

confidence: 99%

Numerical study and experimental validation of a Roots blower with backflow design

Sun

Jia

Peng

2018

Engineering Applications of Computational Fluid Mechanics

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A three-dimensional computational fluid dynamics (CFD) model of a Roots blower with a backflow design was established to analyse the effects of the backflow on the Roots blower's performance. A prototype of Roots blower with a backflow design was manufactured to validate the CFD model through the pressure distribution and the mass flow rate. The results showed that the proposed CFD model agreed well with the experimental data. The effects of the sizes and directions of the backflow passage on the Roots blower's performance were then investigated using the validated CFD model. It was found that under a properly sized backflow passage, the pressure pulsation and the shaft power can be decreased by 80% and13%, respectively; However, the mass flow rate was reduced by 12% under the same size of backflow passage. Although the direction of the backflow passage affected the shaft power, it had no effect on the mass flow rate or pressure pulsation. The shaft power consumption of a Roots blower with a vertical backflow was 4% lower than a horizontal backflow.

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Combined experimental and calculation study of conductance of Roots pump channels

Cited by 23 publications

References 1 publication

Effects of stable clearances on backflow in the variable-pitch screw vacuum pump

Effects of stable clearances on backflow in the variable-pitch screw vacuum pump

Performance improvement of a large capacity Roots blower based on profile modification

Numerical study and experimental validation of a Roots blower with backflow design

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