Research on the Deposition Characteristics of Integrated Prefabricated Pumping Station

Abstract

Based on the discrete phase model (DPM) solid–liquid two-phase flow model and MATLAB image processing technology, an integrated prefabricated pumping station was taken as the research object to study deposition characteristics under different flow rates, different particle diameters, and different liquid levels. Considering the incomplete symmetry of the internal flow of the prefabricated pumping station, deposition characteristics of the prefabricated pumping station under single/double pumps were also analyzed. Double pumps were symmetrically distributed in the integrated prefabricated pump station, and the movement trajectories of particles at the bottom of the pump pit under the closing inlet valve were measured through the use of a high-speed photography experiment. Results showed that with the increase of the flow rate, the deposition rate of the separated prefabricated pumping station decreased. With an increase of the particle diameter, the movement of particles was farther away from the vertical barrier weir. In the range of particle diameter of 6 to 10 mm, the deposition rate decreased with the increase of the particle diameter. With the increase of the liquid level, the deposition rate decreased, first, and then increased again. In the case of the single pump operation, the deposition rate of the right pump operation was smaller than that of the left pump operation. The variation of the deposition rate when the right pump operated was basically the same as that when the dual pumps operated. The movement path of particle N1 was longer. With the decrease of the flow rate and the increase of the particle diameter, the following feature of the particle decreased, and it was easier to impact the walls and edges, which caused long-term deposition. The research results could provide some suggestions for the design of anti-deposition performance of prefabricated pumping station.

Influence of the Installation Position of Submersible Pumps on Deposition Characteristics in Prefabricated Pumping Stations

“…The CFD numerical computation software, Fluent was used to calculate the internal flow field in the prefabricated pumping station and a multiple coordinate model was adopted. The setting of DPM in Fluent was the same as in [11]. The flow field in the impeller was set to a rotating coordinate system, and the rest was set to a static coordinate system.…”

“…The calculation domain of the whole flow field was divided with the ICEM code. In order to improve the accuracy of the calculation and computing efficiency, a grid independence check was performed [11].…”

“…However, there is currently little research about the influence of the installation position of submersible pumps on the deposition characteristics of pumping stations. In our previous research, we chose the deposition rate in order to study the deposition characteristics of a baffle-type integrated prefabricated pumping station under different flow rates, different particle diameters, and different liquid levels [11]. The deposition characteristics of a prefabricated pumping station under the action of single/double pumps were also analyzed and the motion trajectory of particles at the bottom of the pump pit when the closing inlet valve was closed were measured by using a high-speed photogrammetry system.…”

Effects of oscillation frequency on the flow characteristics of a centrifugal pump impeller with sinusoidal flow rate

“…Other researchers analyzed the stability of centrifugal pump from the perspective of energy change 12–18 and vortex development. 19–26 These studies give researchers a clear understanding of the internal flow characteristics of centrifugal pumps under quasi-steady conditions.…”

The Influence of Geometric Parameters of Pump Installation on the Hydraulic Performance of a Prefabricated Pumping Station

“…The relationship between tank bottom diameter and tank height was studied, and the basic mechanism of sediment deposition in prefabricated pumping stations was expounded. Based on the discrete solid-liquid two-phase flow model (DPM) and MATLAB image processing technology, Kang W.et al [14] analyzed the settlement characteristics of a prefabricated pumping station under the action of a single pump and double pumps and measured the movement track of sediment particles at the bottom of the pump station. Qing L.et al [15] revealed the flow characteristics of water and sediment in the prefabricated pumping station and optimized the geometric parameters of the water tank to reduce sand deposition.…”