Energy Performance and Radial Force of a Mixed-Flow Pump with Symmetrical and Unsymmetrical Tip Clearances

Hao, Yong Ping; Tan, Lei; Liu, Yabin; Xu, Ye; Zhang, Jinsong; Zhu, Baoshan

doi:10.3390/en10010057

Cited by 49 publications

(24 citation statements)

References 25 publications

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“…The boundary conditions are set as the total pressure at pump inlet, the mass flow rate at pump outlet and no slip wall at walls. The methods of frozen rotor and transient rotor stator are applied to coupling the rotational and stationary domains for steady and unsteady calculations, respectively [21][22][23][24].…”

Section: Methodsmentioning

confidence: 99%

Energy Performance and Flow Patterns of a Mixed-Flow Pump with Different Tip Clearance Sizes

et al. 2017

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Tip clearance between blade end and shroud is inevitable in pump operation and of great importance on pump energy performance and pressure fluctuation. As the tip clearance size increases, the head and efficiency of the mixed flow pump drop accordingly. The simulation results show that the development of a leakage vortex is observed as the tip clearance increases, and the trajectory of this leakage vortex remains in the same direction along the blade suction side for different tip clearances. With the increase in tip clearance size, the intensity of the leakage vortex is enhanced, and the separation between the main leakage vortex and the secondary leakage vortex is also strengthened. The leakage separation angle near the blade tip remains at the same value of 10° for different tip clearance sizes. As for the spectrum analysis, the maximum amplitudes of pressure fluctuations dramatically increase in the impeller when the tip clearance increases from 0.0 mm to 1.0 mm, and the dominant frequencies go from 145 Hz to 184 Hz due to the considerable leakage flow.

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Section: Methodsmentioning

confidence: 99%

Energy Performance and Flow Patterns of a Mixed-Flow Pump with Different Tip Clearance Sizes

et al. 2017

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“…Therefore, this model has high accuracy in predicting flow separation under adverse pressure gradient. Here, the turbulent viscosity can be expressed as follows [24][25][26]: …”

Section: Governing Equationsmentioning

confidence: 99%

Study of the Gas Distribution in a Multiphase Rotodynamic Pump Based on Interphase Force Analysis

Zhang

Zahid

et al. 2018

Energies

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Abstract:The performance of multiphase pumps has a remarkable influence on the related industrial application. In order to understand the flow field and gas-liquid phase interaction characteristics of a multiphase rotodynamic pump, detailed numerical analysis of the pump with a medium of air-water combination was carried out for the whole flow passage by means of a structured mesh using ICEM_CFD and TurboGrid. The results for 21% inlet gas void fraction (IGVF = 21%) condition showed that the magnitude ratio of non-drag forces to drag in impeller and guide vane passages was generally less than 1, whereas it was always less than 0.2 for the magnitude ratio of turbulent dispersion force to drag. When the IGVF was increased, the variation range of interphase forces in the impeller was greater than that in the guide vane. In addition, the gas in the impeller mainly accumulated near the suction surface in the outlet region. Further, with increased IGVF, the degree of aggregation increased as well as the gas inhomogeneity, and consequently the interphase forces in the impeller increased. Due to the divergent structure of the guide vane, obvious vortexes emerged at the hub and gradually moved toward the blade pressure surface along the streamwise direction.

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“…This might be attributed to force and pressure undulation in the high speed rotating machinery [35][36][37][38][39]. Then the rotor drifts up 15 m with increase of rotor speed.…”

Section: Test Results and Analysismentioning

confidence: 99%

Development and Application of Integrated Aerodynamic Protuberant Foil Journal and Thrust Bearing in Turboexpander

Lai

Guo

Wang

et al. 2017

International Journal of Rotating Machinery

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Foil bearing provides compliant support and moderate Coulomb friction for rotor-bearing system, which is conducive to stability and reliability of high speed rotating machinery. In this paper, both hydrodynamic lubricated foil journal and foil thrust bearings are applied in a 150 m 3 ⋅h −1 turboexpander for air separation. In the bearings, protuberant foil is chosen as the supporting subfoil due to its merits of easy fabrication and assembly. Static loading and deflection of the bearings are tested, respectively, before integration into the turboexpander. Afterwards, the loading and deflection curves of the journal and thrust bearings are polynomial fitted using least-square method. Then, performance tests are carried out on the rotor-bearing system, including transient speed-up, high speed, and speed-down processes. In the tests, the turboexpander supported by the hydrodynamic foil bearings operates smoothly with repeatability. Maximal rotor speed of the turboexpander reaches 52000 rpm with hydrodynamic lubricated protuberant foil bearings.

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Energy Performance and Radial Force of a Mixed-Flow Pump with Symmetrical and Unsymmetrical Tip Clearances

Cited by 49 publications

References 25 publications

Energy Performance and Flow Patterns of a Mixed-Flow Pump with Different Tip Clearance Sizes

Energy Performance and Flow Patterns of a Mixed-Flow Pump with Different Tip Clearance Sizes

Study of the Gas Distribution in a Multiphase Rotodynamic Pump Based on Interphase Force Analysis

Development and Application of Integrated Aerodynamic Protuberant Foil Journal and Thrust Bearing in Turboexpander

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