Research On Ship Model Test And Numerical Simulation For Turning Back Curved Channel

The Xiangjiang River is a core component of the "Two Horizontals,One Vertical,Two Networks,and Eighteen Lines" plan and an important link,whose role cannot be ignored.The curved waterway of Pipazhou is located in the Wuxi hub reservoir area.Due to its large water depth and typical small radius curved waterway,the shape belongs to a turning back,making it a highly distinctive and representative waterway.In order to better understand this type of waterway,we need to carefully study and analyze its characteristics.Curved waterways are a common phenomenon in the category of river channels in China.The appearance of curved waterways often changes the flow pattern in the river channel,and the water flow situation also changes accordingly,becoming very complex and easily causing adverse effects on ship navigation.Therefore,in order to improve the navigation conditions of ships at bends,this article,based on ship model navigation tests and MMG ship maneuvering motion mathematical model tests,relies on the small radius curved channel regulation project in Pipazhou,Xiangjiang,and selects small-scale ship model technology to conduct a detailed study on the navigation parameters of ships such as rudder angle,drift angle,and speed under the set representative flow conditions,At the same time,a simulation program is used to conduct detailed simulation calculations and analysis.The main research content and conclusions of this article are as follows:(1)Pilot trial of the boat on a minor dimension through the Biwazhou Beach Channel of the Yangtze River between Yongzhou and Hengyang,it is found that there are differences in the driving conditions of ships in different channel layout schemes,so that in-depth research and detailed analysis are carried out to determine the best route for ships.Then,the small-scale ship model test was discussed,and the key factors affecting the layout of the navigation trough were analyzed.The technical difficulties in the layout of the navigation trough were overcome.(2)Based on the analysis of physical models and self-propelled ship model tests,it is concluded that the formation of the sharp bend in Pipazhou is related to the factors that cause the radius of the bend to be too small.To solve this problem,a series of effective measures can be taken,such as building dams,expanding the radius of the bend,optimizing the design of the route,Enhancing the flight schedule and raising the traffic volume of the flights and implementing efficient channel regulation schemes.(3)After systematic research,using MATLAB software to compile relevant programs and build a mathematical model of ship maneuvering motion,a simulation test platform is established.This model can effectively and comprehensively reflect various complex mechanisms involved in the process of ship traveling,and can adopt different test plans for simulation based on different test situations.At the same time,verifying the appropriateness of the vessel rigging motion matrix by actual marine measurements.Thus laying a good foundation for the next step of simulation test research and application.(4)This thesis combines the experimental outcomes of the trial modelling of vessels on a limited size and the experimental demonstration of the numerical structure of the ship’s handling mechanism,a consistent conclusion has been reached that the best route for a ship is to go up the convex bank in the slow flow zone on the left bank and down the mainstream of the river.