The Influenced Distance Of Head Spur Dike To Navigation Flow Conditions

In waterway regulation project, spur dike is one of the common buildings, having the using with bouquet of narrow stream, de-siltation scour depth, protect the clean from brushes and stable river bank. Built in the river near the alignment of spur dike shore will change the flow regime, forming complex three-dimensional flow, it may affect the ship navigation safety. But the ship navigation safety effects has not definite calculation methods and basis theoretical, therefore, analyzing the three-dimensional flow near the spur dike of navigation and safety factor, researching on navigation distance near spur dike effects and establishing the reasonable formula are vital significant for ships sail on safety, avoiding touch the alignment of accidents and alignment of the application in waterway regulation project.Combining ship dynamics and predecessor's research achievements, navigation safety factor is analyzed. The summary and analysis of lateral thrust, overturning the lateral drifting and shipping rudder itself is carried. By analysis, ships sail on the environment of the lateral force and moment is constantly changing, and if the ship rely solely on itself against the rudder effect is not very safe, therefore, according to the theoretical analysis, it needs to sink test to analysis of ship sailing alignment effects of a safe distance.In order to specific study the spur dike section three-dimensional velocity distribution and the alignment of flow pattern on navigable influence, etc, experiments are of spur dike section. From the experimental results, the carried out in the generalized model flume, and the Doppler Vectrino is utilized to measure the spur dike section velocity using, and analyze the velocity distribution three-dimensional velocity distribution of spur dike section is understood more clearly. And the most important is that a phenomenon was observed in which the change rate of the lateral velocity at the spur dike section tends to zero in the certain scope distance near the spur dike head. This distance was considered as the affect navigation distance of the spur dike. Finally, through analyzing the various influence factors, the relevant relations of influenced navigation distances with Froude number and compression ratio are obtained.