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

Sun, Shukai; Jia, Xiaohan; Peng, Xueyuan

doi:10.1080/19942060.2017.1419148

Cited by 19 publications

(11 citation statements)

References 24 publications

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“…However, the turbulent viscosity coefficient should be calculated with strain rate instead of a constant according to the study conducted by Shih, Liou, Shabbir, Yang, and Zhu (1995). In order to make the flow conform to the physical laws of turbulence, the realizable k-ε model, therefore, is obtained by modifying the standard k-ε model (Mou, He, Zhao, & Chau, 2017;Niu et al, 2017;Sun, Jia, Xing, & Peng, 2018;Wu et al, 2011;Zhang et al, 2014). In addition, Wu et al (2011), Qin, Xiao, Zhou, Wu, and Xu (2016) and Wang, Silaen, Tang, Barker, and Zhou (2017) used the realizable k-ε model to research the settling chamber and the simulation results were in accord to their experiment results.…”

Section: Airflow Field Dynamics Modelmentioning

confidence: 99%

Study on the key structure parameters of a gravity settling chamber based on a flow field simulation

Liu

Zhang

et al. 2019

Engineering Applications of Computational Fluid Mechanics

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A gravity settling chamber plays an important role in improving the effect of the dust removal when it is selected as a dust collector in a pneumatic cleaning system for cleaning a subway tunnel. The settling rate and the indexes evaluating the secondary blowing are studied to assess the effect of the dust removal in this paper. Regarding the length of the settling chamber, the height of the inlet duct, and the diameter and height of the outlet duct as the variables of the key structures, a flow field simulation analysis of the gravity settling chamber with different heights of the dust accumulation is carried out, then the key structure parameters are optimized by means of the experimental method of uniform design. Finally, the settling chamber with an excellent dust removal effect is obtained. Major conclusions can be drawn as follows. (1) The maximum velocity and the mean velocity ratio of the airflow near a dust accumulation surface are important evaluation indexes for judging the secondary blowing. (2) The maximum velocity near a dust accumulation surface usually doesn't appear on the vertical plane through the axis of the inlet duct or the outlet duct. (3) An excellent settling effect can be ensured during the whole cleaning process only when the maximum design height of the dust-accumulation surface is considered as a key working condition. (4) An excellent settling effect can be realized if the settling chamber without any filtering device and affiliated baffle structure are long enough. (5) The secondary blowing can be avoided if the inlet and outlet of the setting chamber are far away from the dust-accumulation surface. This study has a good guiding significance for the design of gravity settling chamber.

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Section: Airflow Field Dynamics Modelmentioning

confidence: 99%

Study on the key structure parameters of a gravity settling chamber based on a flow field simulation

Liu

Zhang

et al. 2019

Engineering Applications of Computational Fluid Mechanics

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“…For the velocity of the grid points (4, 5, 6, 7), the velocity u in the x-direction and the velocity v in y-direction are all 0, and their pressure are the average values of their surrounding grid points and their own values. As examples, boundary conditions of the grid points (1,3,6) are listed as follows:…”

Section: Grid Divisionmentioning

confidence: 99%

Noise Prevention Research in the Hyperbaric Oxygen Chamber by Flux Vector Splitting Format

Langari

2019

IEEE Access

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This paper describes the application of computational fluid dynamics(CFD) in noise prevention of hyperbaric oxygen chambers. The flux vector splitting format and matrix transformation are used in the calculation of flow field in the hyperbaric oxygen chamber. At first, this paper simplifies the model of the hyperbaric oxygen chamber, and calculates the conservative state equation by flux vector splitting format. Being auxiliary to initial conditions, boundary conditions, meshing, time steps, and other computing elements, this paper gets the transient distribution of the parameters of each time step from flowing start to its near stop. Through displaying the data by graphic, we get the flow velocity variation, the location of the shock wave, the variational trend of pressure, and the variational trend of temperature. This paper compares the numerical and experimental results. Their similarity degree is high and this proves the feasibility to design Low-noise hyperbaric oxygen chamber by this numerical calculation method. INDEX TERMS Flux vector splitting format, hyperbaric oxygen chamber, computational fluid dynamics (CFD), noise analysis, cabin experiment.

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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%

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

Cited by 19 publications

References 24 publications

Study on the key structure parameters of a gravity settling chamber based on a flow field simulation

Study on the key structure parameters of a gravity settling chamber based on a flow field simulation

Noise Prevention Research in the Hyperbaric Oxygen Chamber by Flux Vector Splitting Format

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

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