Three-dimensional numerical simulation and experimental validation of flows in working chambers of roots blowers with backflow design

Sun, Shukai; Zhou, Qin-Jie; Jin, Weiyang; Peng, Xueyuan

doi:10.1088/1757-899x/232/1/012079

Cited by 4 publications

(2 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In [12] three-lobe Roots pump with gas bypassing from output into cutoff volume is modeled in Ansys Fluent software. Comparison with experiment shows good agreement.…”

Section: Zusammenfassungmentioning

confidence: 99%

Efficiency improvement of Roots vacuum pump working process

Бурмистров¹,

Raykov²,

Исаев³

et al. 2022

Vak Forsch Prax

View full text Add to dashboard Cite

Summary In this paper influence of rotor profile type of Roots vacuum pumps on backward leakage through channels of rotor mechanism and pumping speed is considered. Elliptical, involute, and circular profiles are widely used. Backward leakage through channels of rotor mechanism with different rotor profiles is determined from conductance which was calculated by angular coefficients method for free molecular flow regime at different rotors rotating angles. It is shown that backward leakage is maximal at rotors rotating angles 25–45° due to maximal inter‐rotor channel opening for gas flow and is minimal at 0°. Elliptical rotor profile provides minimal backward leakage over one revolution. Numerical modeling of Roots pump working process was carried out on the basis of CFD ANSYS‐CFX complex by dynamic meshing method. SST turbulence model was used for calculations. It is confirmed that maximal pumping speed is provided by Roots pump with elliptical rotor profile.

show abstract

“…In [12] three-lobe Roots pump with gas bypassing from output into cutoff volume is modeled in Ansys Fluent software. Comparison with experiment shows good agreement.…”

Section: Zusammenfassungmentioning

confidence: 99%

Efficiency improvement of Roots vacuum pump working process

Бурмистров¹,

Raykov²,

Исаев³

et al. 2022

Vak Forsch Prax

View full text Add to dashboard Cite

show abstract

“…Theoretically, it belongs to a cooling reflux structure, but due to the fact of its body size and the necessity for more accurate settings, it was only suitable and recommended for usage on a few specific occasions. Sun et al [20,21] carried out simulation calculations on a commonly used Roots pump with a cooling reflux structure and concluded that the reflux structure had quite obvious optimization effect on the outlet pressure pulsation. They revealed that this technique could restrain the exhaust pulsation by approximately 50%, while the efficiency could be reduced to a certain degree in the pump.…”

Section: Introductionmentioning

confidence: 99%

Influence of Different Reflux Groove Structures on the Flow Characteristics of the Roots Pump

Xing

Zhang²,

Fang³

et al. 2022

Machines

View full text Add to dashboard Cite

A Roots pump often exhibits the typical characteristics of high gas pressure in the exhaust port, low pressure at a basic volume and large airflow pulsation at the outlet as a result of gas reflux. In light of this, this study employed Pumplinx software for the numerical calculation of the entire flow field of a two-bladed Roots pump. The effects of the rectangular and curved reflux groove structures on the internal flow field of a Roots pump, especially on the outlet pressure pulsation and flow rate, were unveiled separately. The rectangular reflux groove controlled the angle and thickness, while the curved reflux groove regulated the coordinates of the key points on the Bezier curve. It is worth recognizing that different reflux groove structures were not noticeable in enhancing the inlet measurement flow pattern; reduce the exhaust pressure pulsation, flow pulsation and exhaust section vortex. Interestingly, the rectangular return groove far outweighed the curved groove when optimizing the pressure and flow pulsation when registering the higher flow loss compared to the curved return groove. The merits and demerits of the Q criterion and omega criterion in characterizing the vortex structure of the flow field in the Roots pump were compared by Tecplot software. The omega criterion looked more robust, clear and continuous in revealing the strong and weak vortices in the Roots pump. The outcome of this research work could provide a reference for the study of Roots pump airflow pulsation, vortex analysis and casing structure design optimization.

show abstract