Research And Optimization On Tail Of Twin-skeg In Shallow-water Based On CFD Theory

Heilongjiang River covering a wide area,which has a crucial role in northern economic development,it needs to be managed and maintained to ensure the smooth flow channel.As one of the important Heilongjiang ship,navigation mark ship carrying the important task of maintaining border waterways to ensure maritime security.To protect the safety and smooth flow of Heilongjiang channel,it is need to build a number of excellent performance buoy boat.However due to Heilongjiang River with shallow depth,need for shallow draft,high-efficiency energy-saving vessels is urgent.While synchronized with the development of the times,as a result of energy shortages,rising fuel prices and other phenomena,Government and research scholars give more attention on the study of energy-saving ship.After decades of development,the existing navigation mark ship formed some main ship,such as tunnel tail and two-tail tail.The ship verified by the previous:a two-tailed tunnel hull ship is better than energy savings.At the same time by the real proof of the two-tail hull,it had high propulsive efficiency,energy saving effect,good benefits.Considering the conditions and requirements of the navigation of the ship,a good two-tail stem which has good energy-saving effect was chosen,and tail type was optimized.Domestic and foreign scholars did a lot of research on two-tail stern type.But it is lack of a detailed study of the two-tail stern about its parameter in shallow areas.Therefore,starting from theory and reality,this paper mainly considered shallow draft Heilongjiang channel characteristics and used numerical simulation method and tried to fide Optimal ship type by comparing characteristics of different designs of ships in shallow tail type.The main contents are as follows:First,according to the design requirements of the Heilongjiang,two-tailed ship buoy demonstration program were conducted.Use Maxsurf software,for the two-tailed ship characteristics of the original two-tailed ship hull molded line transformation and modeling were conducted.Secondly,the comparison test and numerical simulation based on the resistance of the ship model calculation results demonstrated Fluent software to calculate the two-tailed ship in terms of feasibility.Then,using Fluent software,two-tailed ship in shallow water movement were simulated at different speed,different flight conditions deep,and the influence of shallow water effect on the two-tailed ship were analyzed.There are many parameters that control the shape of two-tailed stern,selecting two of the most influential parameters that is the stern line spacing,and in a longitudinal section cut position.Next,using Fluent software,respectively,two-tailed ship with a different pitch or different vertical position of the cut section line were simulated,the resistance of disembark mold were computed in different speed,different working conditions depth.Finally,through the distribution trends of resistance and flow field related images,data comparison,each parameter variation with depth and speed of the trend and the mutual influence between two parameters were analyzed.So the optimal ship which provide the necessary basis for the future two-tailed river ship design and research were inferred.