Abstract
Due to different inertia, sediment particles stop following the trails of water elements during the flow passage of a centrifugal pump. In a dredge pump, deviation characteristics of sediment particles from surrounding fluid are still not crystal clear. Apparently, the deviation makes sediment particles attacking the inner wall and causes wear and tear. In addition, the deviation would also decrease the pump efficiency. In order to understand the motion of the sediment particles and their deviation characteristics inside a dredge pump, authors built a Lagrangian numerical model based on particle’s kinematic balance equations, and then verified it through a rotating platform. The influential factors of the sediment particle motion, such as the rotation speed, as well as the diameter and density of sediment particles, were investigated. Finally, a conclusion is obtained that says if blade profiles are close to the relative trajectory of a particle, this particle will cause minimized wear to the blade wall.
Highlights
Copping with the booming business of land reclamation from the sea, navigation channel construction and maintenance, and sediment deportation from reservoirs and lakes, dredge manufacturing industry is developing remarkably fast
The location of wear depends on contact of particles with internal surface of pump which is again decided by hydraulic conditions, the composition, and type of solids carried inside the pump
Five different initial positions were assumed for a particle
Summary
Copping with the booming business of land reclamation from the sea, navigation channel construction and maintenance, and sediment deportation from reservoirs and lakes, dredge manufacturing industry is developing remarkably fast. Centrifugal dredge pumps are often used to transport dredged sediment.[1] Dredger pumps often suffer severe wear damage of internal surfaces after a certain operation period of time, especially for transporting sand and gravel, which will reduce the dredge pump efficiency and effective head, as well as the reliability and stability of pump, and eventually shorten the life of the pump. The location of wear depends on contact of particles with internal surface of pump which is again decided by hydraulic conditions, the composition, and type of solids carried inside the pump. Working life of a dredge pump can be realized only if the parameters chosen for the pump elements, sediment, and transport conditions will provide economic transport with minimal wear. Research on the route of coarse granular sediment particles in centrifugal dredge pumps is meaningful
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