Investigation on pressure fluctuations of dual - and analogical single-rotor turbine flowmeters

Ren, Zhipeng; Zhou, Weixing; Li, Deyou

doi:10.1177/09544062221074605

Cited by 6 publications

(3 citation statements)

References 18 publications

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“…Pressure signals were collected for 10 revolutions after the rotors have evenly rotated for 20 revolutions. This normalized pressure coefficient is defined to characterize the degree of pressure fluctuation, 34 expressed as where C p is the normalized pressure coefficient; p is the pressure of measuring points (Pa); p false¯ is the average pressure of measuring points within the sampling time (Pa); ρ is the mixing density (kg/m 3 ); U is the impeller outlet circumferential velocity (m/s). To research the frequency characteristics, the FFT was applied to these measuring points.…”

Section: Numerical Modeling and Schemesmentioning

confidence: 85%

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Dissolution and evolution effects on pressure fluctuations in a space micropump

Ren

Hao

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part E:

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The purpose of this paper is to reveal the dynamic mass transfer effects between gas and liquid on pressure fluctuations in a space micropump using our proposed computational model of gas–liquid mass transfer. Complex dissolution and evolution processes were applied to achieve accurate dynamic gas–liquid mass transfer predictions in the micropump. The validation of experiments was conducted by measuring the performance characteristics of the micropump, and the mass transfer model was verified by a dissolved oxygen concentration experiment in plug discharge flow. Based on this, four conditions including unsteady single-phase, two-phase without mass transfer, dissolution, and coexisting dissolved–released flows calculations are discussed to clarify the frequency contents, generation reasons, and propagation law. Combined with entropy production analysis, the pressure fluctuation influenced by the dissolution and evolution is illustrated. The results exhibit that the evolution of the gas is located on the head of the long blade suction surface in the impeller. When a unidirectional gas-to-liquid dissolution process occurs, the fluctuating amplitude of the characteristic dominant 5 fn is significantly weakened; otherwise, when dissolution and evolution coexist, the amplitude is significantly promoted as the released gas increase the flow instability. In addition, the distributions of local high entropy production induced by mean and fluctuating velocity gradients overlap that of large mass transfer rates and high amplitude of the mixing frequency in the volute, exhibiting the relationship between entropy production, mass transfer, and flow instability. The current study provides a guidance that the dissolved gases’ concentration must be controlled strictly to avoid the evolution of gas for the safety and stability of the space hydraulic system.

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Section: Numerical Modeling and Schemesmentioning

confidence: 85%

Section: Numerical Methods and Boundary Conditionsmentioning

confidence: 99%

Dissolution and evolution effects on pressure fluctuations in a space micropump

Ren

Hao

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part E:

Self Cite

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“…In the research of dual-rotor turbine flow meters, the rotor response, combined with visualization experiments and unsteady simulations, was investigated by Ren et al [1,2]. Their research showed that the downstream rotor speed compensates for speed calculation, reducing measurement instability of the upstream rotor.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Cavitation Flow and Entropy Production Characteristics in a Dual-Rotor Turbine Flowmeter

Liu,

Zhang,

Wang

et al. 2024

Processes

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Flow meters are extensively utilized in fields such as chemical engineering, petroleum, and aerospace, and are an indispensable component of modern industry. This paper examines the metrological properties of a dual-rotor turbine flow meter within its measurable flow range through experimental approaches and investigates the cavitation flow dynamics within the flow meter using numerical methods. First, the flow characteristics curve of the dual-rotor turbine flow meter was established experimentally, and the accuracy of numerical simulation results was validated. Secondly, the transient characteristics of the cavitation cavity were revealed using the Z-G-B cavitation model and dynamic mesh technology. Finally, entropy production theory was applied to investigate the energy losses caused by cavitation, analyzing the contributions of different types of energy losses during the cavitation process. Flow calibration experiments and numerical simulations reveal an increase in the meter coefficient of the dual-rotor turbine flow meter in high-flow cavitation zones, indicating that the displayed flow rate is slightly higher during cavitation compared to non-cavitating flows. Transient cavitation flow undergoes three stages: attachment, development, and collapse. At 323 K, the volume fractions of upstream and downstream cavities increase by 38.9% and 48.3%, respectively, with the cavitation cycle duration being 1.21 times that at 298 K. At 343 K, these increases are 75.3% and 239.2%, with the cycle duration being 2.63 times that at 298 K. Among the various sources of loss, the contribution from losses due to pulsating velocity gradients is the most significant, with maximum proportions of 81.95%, 85.1%, and 87.11% at 298 K, 323 K, and 343 K, respectively.

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Spatial-temporal evolution mechanism of mass transfer under synergetic gaseous and vapour cavitating effects in a micropump

Ren,

Li,

et al. 2024

Energy

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Investigation on pressure fluctuations of dual - and analogical single-rotor turbine flowmeters

Cited by 6 publications

References 18 publications

Dissolution and evolution effects on pressure fluctuations in a space micropump

Dissolution and evolution effects on pressure fluctuations in a space micropump

Investigation of Cavitation Flow and Entropy Production Characteristics in a Dual-Rotor Turbine Flowmeter

Spatial-temporal evolution mechanism of mass transfer under synergetic gaseous and vapour cavitating effects in a micropump

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