Research On Key Technology Of Harbor Basin Desilting Vehicle Based On Savonius Rotor

The port ocean channel affects many human infrastructures related to marine economic activities,such as fishery,transportation,logistics and tourism.The efficiency,connectivity and capacity of ports and channels have always been an important direction for port development.As an area providing vessel operation,steering and berthing in the port,the harbor basin requires sufficient area and water depth.If the bottom of the pool is too deep,it will cause too shallow water in the harbor,posing a safety threat to navigational safety and reducing the accessibility of port infrastructure.At present,the method of dredging the harbor basin mainly relies on largescale dredging ships.However,mechanical dredging equipment consumes high manpower,material and financial resources,and the construction is difficult.Moreover,some small harbor basin cannot travel to the harbor basin due to its own conditions,large dredgers and simply excavators.Based on the natural geographical location of the harbor and the huge marine energy resources,a silt cleaning mechanism driven by tidal energy is proposed in this paper.Silt cleaning mechanism,relying on the vertical axis Savonius impeller to capture the tidal current and obtain power.The integrated dredging device is studied through a combination of numerical simulation and experimental research.The main research contents are as follows:Based on the Realizable k-ε turbulence model,a three-dimensional numerical open channel flow model was established.The corresponding experimental tests are carried out in the existing wave current flume in the laboratory,which provides the basic conditions for the follow-up numerical simulation research.A spiral Savonius impeller dynamic model was established.In order to improve the energy capture efficiency of the impeller,numerical methods were used to simulate the influence of helix angle,overlap ratio,and height-diameter ratio on the hydrodynamic performance of the impeller in a three-dimensional numerical flow tank,and optimized structural parameters are verified by the numerical simulation results through physical experimental models at different flow rates.For the optimized spiral Savonius impeller,an integrated device of S-type impeller and dredging mechanism is established.This paper analyzes the dredging mechanism based on the Savonius impeller harbor basin desilting vehicle,uses the Euler multiphase flow model to establish the sediment deposition numerical model,and analyzes the influence on the dredging efficiency under the conditions of agitating blade angle,sediment particle size and rotating speed under different velocity through simulation.The corresponding experimental model was set up,and the natural river sand was selected and tested in the wave current flume under different velocity conditions.The conclusions of this study provide a new design scheme for the self-cleaning technology of the harbor basin,which has certain application prospects and practical engineering significance.