Influence of the solution pH on the design of a hydro-mechanical magneto-hydraulic sealing device

Li, Wangxu; Li, Zhenggui; Zhao, Qin; Yan, Shengnan; Wang, Ziyue; Peng, Shengyang

doi:10.1016/j.engfailanal.2022.106091

Cited by 44 publications

(17 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…With the rapid development of computer technology, CFD (Computational fluid dynamics) technology has become an important method to study fluid (Li et al, 2021b;Li et al, 2021c). In this study, we employed numerical calculation and PIV test method study the vaneless space of a Francis pump-turbine under pump and turbine modes.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Computational Fluid Dynamics Study of the Flow Field of a Model Pump Turbine

Deng¹,

Xu²,

Li³

et al. 2022

Front. Energy Res.

View full text Add to dashboard Cite

The pumped storage unit has a hump area and S characteristics during operation. The operating conditions of the unit are complex, and it is necessary to switch between working conditions. The unit frequently crosses the hump area and the S characteristic area, thus hindering the unit to connect to the grid. Severe vibration affects the safe and stable operation of a power station. With the joint efforts of the industry, the impact of the hump and S-shaped problems on project commissioning has been fundamentally resolved, but the mechanism of inducing hump and S-shaped problems has not yet been well established. Therefore, in this study, the particle image velocity measurement method based on a full-characteristic test was adopted. According to the operating characteristics of the unit, 32 operating points with four guide-vane opening degrees were selected to test the flow pattern in the vaneless space. After subtracting the average flow velocity, the vortex image of the leafless area was obtained, which provided a reference for the design of the runner of the water pump turbine.

show abstract

Section: Introductionmentioning

confidence: 99%

Experimental and Computational Fluid Dynamics Study of the Flow Field of a Model Pump Turbine

Deng¹,

Xu²,

Li³

et al. 2022

Front. Energy Res.

View full text Add to dashboard Cite

show abstract

“…The moving medium of the mixed pump is a gasliquid two-phase mixed medium, and the flow state of the medium in the flow channel is complicated, but from the macroscopic dimension, it still obeys three conservation laws: mass conservation, energy conservation and momentum conservation (Li et al 2021;Li et al 2022). For the internal flow problem of the mixed pump, it can be regarded as the solution of a viscous incompressible flow problem without heat exchange.…”

Section: Flow Control Equationsmentioning

confidence: 99%

Influence of Bionic Waveform Leading Edge Blade on Drag Reduction Characteristics of Mixed Pump

2023

JAFM

View full text Add to dashboard Cite

Because the helical axial flow gas-liquid mixing pump has the great advantage of conveying gas-liquid two-phase mixed medium, it has become the main core equipment for deep-sea oil and natural gas exploitation. The gas phase aggregation and bubble movement trajectory in the impeller channel have been widely studied, but the increase of medium flow resistance caused by flow separation has not been deeply discussed. Combined with the Euler multiphase flow model and the SST k-ω turbulence model, the numerical calculation of the helical axial flow gas-liquid mixed pump is carried out. Under design flow conditions Q = 100 m3/h, head H = 30 m, speed n = 4500 r/min, specific speed ns =213.6 r/min, and under different inlet gas content conditions, the influence of the bionic waveform leading edge blade on drag reduction characteristics of the helical axial flow gas-liquid mixed pump was investigated. By designing the blade with a leading-edge structure with different heights and pitches, the separation of the mixed medium and the suction surface is effectively suppressed, and the flow resistance of the medium in the 1/10 area of the inlet end of the blade is reduced. The results show that when the height A is 0.25%L and the pitch λ is 12.5%h, the maximum drag reduction rate in this region is 52.6%, the maximum increase in efficiency of the mixed pump is 2.2%, and the maximum increase in head is 4.8%. This study can provide technical support for flow drag reduction in gas-liquid mixed pump.

show abstract

“…In order to prevent seal failure, leakage of liquid in the pump or impurities outside the pump from entering the pump cavity, the shaft seal must be considered when designing and applying centrifugal pumps Peng (2021); Xu (2004); Zhao et al (2001). Magnetic liquid seal is a new type of non-contact seal, which shows good advantages in dynamic sealing Li W. et al (2021); Li et al (2022). It has been widely used in dry Roots vacuum pump Li et al (2002), reactor Xu.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Surface Pressure Pulsation Characteristics of Centrifugal Pump Magnetic Liquid Sealing Film

Wang

et al. 2022

Front. Energy Res.

Self Cite

View full text Add to dashboard Cite

In order to discuss the surface pressure pulsation characteristics of the magnetic-fluid sealing membrane of centrifugal pump, this paper studies the surface pressure pulsation characteristics of the shaft end sealing membrane under different flow operating conditions of centrifugal pump based on the combination of numerical calculation and experimental verification. The results show that the pressure value on the surface of the magnetic-fluid sealing film decreases with the increase of the flow rate of the centrifugal pump, and the pressure on the surface of the magnetic-fluid sealing film has periodic pulsation, and the period is the time required for a single blade to sweep the volute separating tongue. In one rotation cycle of the runner, the number of reciprocating movements of the magnetic-hydraulic sealing film is the same as the number of blades of the runner. The main reason for the pressure pulsation is that the impeller periodically sweeps the fixed surface of the centrifugal pump.

show abstract

Influence of the solution pH on the design of a hydro-mechanical magneto-hydraulic sealing device

Cited by 44 publications

References 12 publications

Experimental and Computational Fluid Dynamics Study of the Flow Field of a Model Pump Turbine

Experimental and Computational Fluid Dynamics Study of the Flow Field of a Model Pump Turbine

Influence of Bionic Waveform Leading Edge Blade on Drag Reduction Characteristics of Mixed Pump

Analysis of Surface Pressure Pulsation Characteristics of Centrifugal Pump Magnetic Liquid Sealing Film

Contact Info

Product

Resources

About