Influence of axial clearance on the performance characteristics of a turbopump

Li, Deyou; Ren, Zhipeng; Fan, Rong; Chai, Yafei; Gong, Ruzhi; Wang, Hongjie

doi:10.1007/s12206-021-0924-2

Cited by 3 publications

(1 citation statement)

References 20 publications

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“…They found a variable called the total vapor fraction to predict critical net positive suction head. Also, many scholars [13][14][15][16][17][18][19][20][21][22] carried out the research on the tip leakage vortex, pressure pulsation, and cavitation mechanism fields in hydraulic machinery and obtained a certain number of achievements, while for studies on energy loss characteristics in hydraulic machinery, an increasing number of scholars use the entropy production method to investigate the loss characteristic accompany with the numerical simulation. Comparing with traditional energy evaluation method, entropy generation analysis method can intuitively and quantitatively determine the position of mechanical energy dissipation in hydraulic machinery; thus, this method is currently applied by some researchers.…”

Section: Introductionmentioning

confidence: 99%

Research on Cavitation Flow Dynamics and Entropy Generation Analysis in an Axial Flow Pump

Shen

Huang

et al. 2022

Journal of Sensors

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The entropy generation theory is introduced to investigate the effects of different NPSH and tip clearance size on the cavitation flow dynamics and mechanical energy dissipation intuitively and quantitatively within an axial flow pump through numerical simulations. The results indicate that main mechanical energy dissipation of the pump gathers in part impeller and diffuser, and most are turbulent dissipation. Meanwhile, the impeller is the largest place of mechanical energy dissipation of the pump under cavitation conditions, accounting for more than 50%. NPSH has significant effects on the cavitation pattern, which reflects on the field that the areas of attached sheet cavitation and tip leakage vortex cavitation around blades increase obviously with NPSH reducing under the tip clearance of 0.1% span. With NPSH decreasing, high regions of turbulent dissipation in the impeller mainly expands along blades and move downstream, with span S0.98 near the shroud having larger turbulent dissipation. Besides, high regions of turbulent dissipation are mainly distributed at the rear part of the cavity for every corresponding span of the impeller, which indicates that the turbulent dissipation has a strong relation with the cavitation pattern. In the impeller, the unstable flows cause cavity shedding at the rear of the cavity and wake flows near the blade trail induce higher turbulent kinetic energy, finally resulting in higher turbulent dissipation there. Under the same NPSH, areas of tip leakage vortex cavitation and areas of tip clearance cavitation around the tip both expand with the tip clearance increasing from 0.1% span to 0.8% span. And high areas of turbulent dissipation also are distributed at the rear of the cavity and moving downstream along the blade suction side, especially at span S0.98. Therefore, the tip clearance width mainly affects the cavitation development and turbulent dissipation distribution near the impeller’s shroud under same NPSH.

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Section: Introductionmentioning

confidence: 99%

Research on Cavitation Flow Dynamics and Entropy Generation Analysis in an Axial Flow Pump

Shen

Huang

et al. 2022

Journal of Sensors

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Frequency-scanning interferometry for axial clearance of rotating machinery based on speed synchronization and extended Kalman filter

Bao

Duan

et al. 2023

Optics and Lasers in Engineering

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High precision dynamic measurement method for axial clearance based on time division multiplexing with dispersive interferometry

Duan¹,

Li²,

Bao³

et al. 2023

Opt. Express

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Rotor-stator axial clearance is a crucial design parameter affecting rotating machines’ efficiency and safety. To accurately measure the dynamic axial clearance in high-speed machinery, a precise method based on time division multiplexing with frequency domain interferometry has been proposed. This method has proven robust and accurate through simulations and experiments. The inclusion of an optical switch enables the utilization of dispersive interferometry(DPI) and time division multiplexing for multiple channels of the light source. It achieves a static accuracy of 1.5 µm for a 15 mm range and a dynamic accuracy of 9 µm at 3000 rpm.

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Influence of axial clearance on the performance characteristics of a turbopump

Cited by 3 publications

References 20 publications

Research on Cavitation Flow Dynamics and Entropy Generation Analysis in an Axial Flow Pump

Research on Cavitation Flow Dynamics and Entropy Generation Analysis in an Axial Flow Pump

Frequency-scanning interferometry for axial clearance of rotating machinery based on speed synchronization and extended Kalman filter

High precision dynamic measurement method for axial clearance based on time division multiplexing with dispersive interferometry

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