Prediction of Abrasive and Impact Wear Due to Multi-Shaped Particles in a Centrifugal Pump via CFD-DEM Coupling Method

The process of pressurized injection of ultra-fine powder extinguishing agents (UPEA) and the effect of injection from the nozzle directly affects the spatial dispersion characteristics and the effectiveness of fire extinguishing. Combining CFD simulations and experimental measurements, the UPEA pressurized injection process and injection effects were investigated. The transient process of injection is divided into three stages, initial injection stage, steady injection stage, and post-injection stage. The post-injection stage is divided into a slow decay process and a residual gas release process. Investigating the effect of different filling conditions on the effectiveness of particle injection. In the stable injection stage, the higher the filling ratio, the lower the mass flow of UPEA particles at the same filling pressure. At the same filling ratio, the higher the filling pressure, the higher the mass flow of UPEA particles. The maximum mass flow of the UPEA particles was 5.38 kg/s at a filling ratio of 20% and a filling pressure of 3.6 MPa. The steady injection time is mainly influenced by the particle filling ratio.

show abstract

“… C n and C t are normal and tangential recovery coefficients, depending mainly on particle properties. 42…”

Section: Mathematical Modelmentioning

confidence: 99%

Numerical simulation of ultra-fine powder extinguishing agent injection process

Zhou

Shi

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

View full text Add to dashboard Cite

show abstract

“…Tang et al (Tang et al, 2021) investigated the effect of particle shape on the wear properties of centrifugal pumps with CFD-DEM. The results show that as the sphericity of the particles increases, the overall pump impact wear first decreases and then increases.…”

Section: Introductionmentioning

confidence: 99%

Prediction of sediment wear of francis turbine with high head and high sediment content

Pan

Han

et al. 2023

Front. Energy Res.

View full text Add to dashboard Cite

Wear of runner blades is a common problem affecting the operational reliability of turbines with high head and high sediment content. In order to accurately predict the wear of the turbine runner blade, based on the solid-liquid two-phase flow equation and turbulence model, the full channel numerical simulation of the internal water and sediment flow was carried out, and the sediment volume distribution and sand water velocity on the turbine runner blade were obtained. Then, according to the digital simulation results and the operating parameters of the turbine runner, the sediment wear test scheme for the turbine blade material specimen is designed, and the sediment wear test is carried out on the runner material. According to the test results, the sediment wear curve of runner blade material is obtained and applied to numerical simulation, and the main position and wear degree of turbine blade sediment erosion are predicted. The inspection results of the runner blade wear after the unit has operated for a flood season show that obvious wear can be seen at the outlet edge of the lower band of the runner blade, and the wear position and wear amount are basically consistent with the simulation values. The study is of great importance for predicting the wear of turbine runner blades with high drop height and high sediment content, and for turbine maintenance under complex conditions.

show abstract

“…It was found that the particle transport in the diffuser was nonuniform, the particle transport in the diffuser was in unit of strands, and the particle transport in the pump was in pulse mode, and the particle transport characteristics in the latter stage were similar to those in the previous stage. Tang et al [22] considered the movement characteristics of particles and simulated the solid-liquid flow in a single-channel pump by CFD-DEM coupling method. The results showed that the smaller the particles, the wider the velocity distribution range and peak value; the larger the particle, the greater the contact force.…”

Section: Introductionmentioning

confidence: 99%

Study on Fiber Clogging Mechanism in Sewage Pump Based on CFD–DEM Simulation

et al. 2022

View full text Add to dashboard Cite

A large number of solid particles and fibrous impurities are always entrained in the fluid transported by a sewage pump, which can easily lead to the blockage of the sewage pump. In view of this, CFD–DEM simulations were conducted in this paper to reveal the fiber clogging mechanism in the sewage pump. A CFD–DEM coupling method with a fiber model was established and verified by an experimental benchmark, i.e., the rectangular flow channel. The method was then applied to a model sewage pump to, after mesh independence tests, analyze the effects of flow rate and fiber length on fiber motion and clogging. The results showed that the position of fiber retention coincides with the position of the vortex, mainly located at the inlet of the impeller, the head of the blade, the middle of the blade, and the tongue in the pump. In the case of a low flow rate, the fiber was more likely to cause blockage in the head of the blade, and in the case of a large flow rate, the fiber would wind around the tongue in the pump. At the same flow rate, long fiber was more likely to stay on the blade’s suction surface.

show abstract

Prediction of Abrasive and Impact Wear Due to Multi-Shaped Particles in a Centrifugal Pump via CFD-DEM Coupling Method

Cited by 20 publications

References 15 publications

Numerical simulation of ultra-fine powder extinguishing agent injection process

Numerical simulation of ultra-fine powder extinguishing agent injection process

Prediction of sediment wear of francis turbine with high head and high sediment content

Study on Fiber Clogging Mechanism in Sewage Pump Based on CFD–DEM Simulation

Contact Info

Product

Resources

About