Characterization of vortex structures with self-excited oscillations based on Liutex-Omega vortex identification method

Wang, Dongdong; Wang, Zhaohui; Fan, Yi; Sun, Ximing; Gao, Qian

doi:10.1007/s42241-023-0011-5

Cited by 4 publications

References 28 publications

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Numerical simulation study of vortex cavitation and induced pulsation characteristics in spiral lobe pumps

Zhou,

Xiang,

Zhou

et al. 2024

AIP Advances

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Lobe pumps are used in many different sectors because of their versatility and effectiveness for managing multiphase flows. In this study, three-dimensional unsteady numerical simulations are performed to evaluate the vortex cavitation phenomenon in these pumps. The work combines dynamic meshing techniques, advanced vortex recognition methods, and a full cavitation model to provide insight into the genesis, evolution, and influence of vortex cavitation on pump performance. The results of the study demonstrate that under high-speed and high-pressure conditions, vortex flow occurs at the edge of the rear of the rotor lobe in the suction chamber of the lobe pump, resulting in the production of vortex cavitation. Cavitation is most strong at the core of the vortex, while the degree of cavitation at the edge of the vortex gradually diminished. The gas volume fraction reduces from 0.135 to 0.0832, and this makes the pressure decrease from 1.055 to 1.02 MP. The process of genesis, development, and removal of vortex cavitation is cyclic. At different levels of cavitation, the degree of pulsation in pump outlet flow, pressure, and radial force increases with increasing cavitation. Periodic vortex cavitation leads to periodic changes in pump output pressure, flow rate, radial force, and axial force.

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Numerical simulation study of vortex cavitation and induced pulsation characteristics in spiral lobe pumps

Zhou,

Xiang,

Zhou

et al. 2024

AIP Advances

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Numerical simulation of rectification and vortex suppression in the inlet sump of a pumping station

Yu,

Yang,

Pan

et al. 2024

J. Phys.: Conf. Ser.

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In response to flow irregularities observed within the inlet sump of a pumping station in Taiwan, this study undertook structural optimization of the inlet sump utilizing numerical simulation techniques based on the Reynolds time-averaged Navier-Stokes (N-S) equations and RNG k-ε turbulence model. A comparative examination of the internal flow characteristics of the inlet sump before and after optimization at the designated flow rate was conducted. The findings revealed that prior to optimization, backflow was evident within the inlet sump under the operational conditions of the four units, coupled with the presence of vortices beneath the intake bell mouth of the pumps, resulting in suboptimal intake conditions. Optimization strategies involved the installation of guide walls between the units, adjustment of the back wall shape, and addition of guide cones beneath the intake bell mouth of the pumps. Results indicated that the guide walls effectively redirected flow, encouraging it to follow along the guide walls, thereby enhancing the flow pattern within the inlet sump. Additionally, the guide cones successfully mitigated the formation of vortices beneath the bell mouth, consequently improving the intake conditions for the pumps.

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Optimization of aerodynamic acoustics in the pipe with variable cross-sections

Zheng,

Miao,

2024

Fourth International Conference on Mechanical, Electronics, and Electrical and Automation Control (METMS 2024)

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Characterization of vortex structures with self-excited oscillations based on Liutex-Omega vortex identification method

Cited by 4 publications

References 28 publications

Numerical simulation study of vortex cavitation and induced pulsation characteristics in spiral lobe pumps

Numerical simulation study of vortex cavitation and induced pulsation characteristics in spiral lobe pumps

Numerical simulation of rectification and vortex suppression in the inlet sump of a pumping station

Optimization of aerodynamic acoustics in the pipe with variable cross-sections

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