Prediction Of Six-DOF Maneuvering Motion And Numerical Simulation Of Dynamic Anti-Sinking Measures For Submarine

The research of submarine navigation safety and combat performance has always been attached great importance,because of the frequent occurrence of sudden safety accidents such as rudder-blocked,stop,loss of buoyancy,submarine safe sailing and emergency maneuvering has gradually been widely concerned.The Computational Fluid Dynamics(CFD)method combined with fine flow field capture technology has become a hot research topic for submarine maneuvering performance evaluation.For complex maneuvers and extreme navigation conditions with high accidents,the relevant data and standards that can guide crew control and submarine design are relatively old,and it is difficult to play a guiding role in complex space movement and emergency maneuvering.On the other hand,the submarine has multiple operating surfaces,but it is difficult to achieve fast and complicated motion as the small underwater robot.Therefore,it is necessary to carry out research on the recovery effect of submarine dynamic anti-sinking measures to improve submarine’s anti-sinking ability by applying vehicle,rudder,ballast water and "high pressure gas" control system reasonably and efficiently,and provide scientific and reliable reference for submarine emergency operation.On BB2 submarine model as the research object,this paper adopted the method of CFD numerical simulation of submarine self-propelled maneuvering motion,underwater six degrees of freedom movement and the flow field in the simulation of solving,application of overset grid technology and principle of automatic steering apparatus respectively to control the course of the rudder deflection and submarine,forecast submarine motion characteristics in the process of movement and control performance,The details of the flow field are captured and the recovery effects of the typical dynamic anti-sinking measures are summarized after the submarine encounters the danger of rudder sticking and water entering.Firstly,the paper carries out the numerical simulation of the submarine’s 6-DOF fixed depth straight line navigation and fixed depth rotation maneuvering motion to control the submarine’s depth and trim.The accuracy of the numerical method is verified by comparing the prediction results with the published tank self-propelled model test results.Then,the influence of submarine depth and pitch attitude on submarine’s space spiral motion is studied by numerical simulation,and the characteristics of "stern weight" during the turning process are analyzed.On this basis,the recovery measures of submarine stuck stern rudder are studied,the motion law of submarine is predicted,and the effect of underwater steering rudder on anti-sinking performance of submarine stuck rudder is summarized and analyzed.Finally,the research on improving anti-sinking performance of submarine in different compartments is carried out,and the dynamic anti-sinking movement law of submarine is predicted.Taking the pitch angle and depth as the target,the recovery effect of different dynamic anti-sinking measures after influent is analyzed and summarized,which provides ideas for the research on anti-sinking performance of submarine.