Three-dimensional numerical simulation and experimental validation of flows in working chambers and inlet/outlet pockets of Roots pump

Sun, Shukai; Zhao, Bin; Jia, Xiaohan; Peng, Xueyuan

doi:10.1016/j.vacuum.2017.01.005

Cited by 50 publications

(28 citation statements)

References 17 publications

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“…The clearances between the rotor and the cylinder in the circumferential direction in the CFD model are increased to 0.15 mm in order to keep the total leakage area unchanged. A narrow pipe was set on the outlet piping throttle of the flow to make the pressure in the outlet piping reach the exhaust pressure, as shown in Figure 5; to obtain a higher precision of the pressure change in the exhaust cavity (Sun, Zhao, Jia and Peng, 2017).…”

Section: 11mentioning

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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Section: 11mentioning

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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“…Their results provided the leakage flow field map in the tip gap. Liu et al [14,15] and Sun et al [16,17] established the CFD simulation model of the roots blower and validated it by measurements of mass flow rate and pressure distribution. Huang and Liu [18] conducted the analysis using 2D numerical meshes at various rotating positions for three-lobe twin-rotor Roots blower.…”

Section: Introductionmentioning

confidence: 99%

“…Whether these CFD models can sufficiently capture the flow field in PDMs remains to be known. The CFD models in PDMs are usually validated by measuring integral parameters such as the total mass flow rate and power [12,14,16]. However, it is doubtful that the simulation leakage flow field is identical with the practical one when the simulated power or mass flow rate agrees with the test result.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigation of Tip Leakage Flows in a Roots Blower

Sun

Singh

Kovačević

et al. 2020

Designs

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Computational fluid dynamics (CFD) can help in understanding the nature of leakage flow phenomena inside the rotary positive displacement machines (PDMs). However, due to the lack of experimental results, the analysis of leakage flows in rotary PDMs by CFD has not yet been fully validated. Particle image velocimetry (PIV) tests with a microscopic lens and phase-lock were conducted to obtain the velocity field around the tip gap in an optical Roots blower. The three-dimensional unsteady CFD model of the Roots blower with the dynamic grids generated by Screw Compressor Rotor Grid Generation (SCORG) was established to predict the gap flow under the same operating conditions. The images obtained by the PIV tests were analyzed and some factors which compromise the quality of test results in the gap flow were identified, such as reflections and transparency of the window. The flow fields obtained by CFD have the same flow pattern and velocity magnitude as the experimental results in the majority of observed regions but overestimate the leakage flow velocity. The CFD results show a vortex induced by the leakage flow in the downstream region of the gap. The flow losses in the tip gap mainly happen at the entrance upstream of the gap. Finally, some suggestions for future work are discussed.

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“…Mesh parameters are very important in numerical calculation, and a new mesh generation algorithm is proposed and applied it to simulate the flow in cylinder and screw pump. The flow characteristics of the working cavity, the inlet and outlet were studied by numerical simulation [11]. In addition to this, the mesh deformation method was successfully used to calculate the piston cylinder [12,13].…”

Section: Introductionmentioning

confidence: 99%

Numerical research on viscous oil flow characteristics inside the rotor cavity of rotary lobe pump

Guo

2019

J Braz. Soc. Mech. Sci. Eng.

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In order to reveal the influence of medium viscosity on flow characteristics in rotary lobe pump, the flow of five media with different viscosities, ranging from 1 (cst) to 110 (cst) has been studied in this paper. Based on the dynamic mesh model and the deformation technology of local grid reconstruction, the effects of viscosity, gap structure and speed on flow rate and pressure were investigated by transient numerical simulation, which were also verified by experiments. The results show that the viscosity has a significant influence on the performance of rotary lobe pump. With the increase in viscosity, the flow of fluid in rotor cavity tends to be steady. And the viscosity force could hinder the leakage flow of the medium in rotor cavity to some extent. The change in viscosity of the fluid medium would affect its outlet flow rate, and the outlet flow rate of 110 (cst) medium is 40% higher than that of the 1 (cst) medium. As the rotational speed is reduced from 400 (r/min) to 100 (r/ min), the outlet flow rate decreases by 95% at 11 (cst) and by 80% at 72 (cst). Additionally, compared with the fixed gap structure, the gradient gap structure can effectively optimize the flow pulsation in the low-viscosity fluid, which reduces the pressure fluctuation by more than 30%.

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Three-dimensional numerical simulation and experimental validation of flows in working chambers and inlet/outlet pockets of Roots pump

Cited by 50 publications

References 17 publications

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

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

Experimental and Numerical Investigation of Tip Leakage Flows in a Roots Blower

Numerical research on viscous oil flow characteristics inside the rotor cavity of rotary lobe pump

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