Numerical Simulation And Experiment Reseach Of Diver Propulsion Vehicle

Diver propulsion vehicle(DPV)is a kind of small propulsion vehicle which carries the diver in high speed underwater navigation.The diver can grasp or ride on the DPV and operate the propeller to rotate for high-speed underwater navigation.The traditional numerical simulation method regards the diver and DPV as a relatively fixed rigid body to predict the overall rapidity.However,the actual situation is that the human body will produce active or passive movement changes when the DPV is in the process of heave,steering and variable-speed navigation,which is a complex dynamic process,and has a huge impact on the rapidity and heading stability of DPV.In contrast,DPV's shape and propeller arrangement also have an impact on the human body's posture when dailing:too fast DPV has problems such as the wake attacking the human body's abdomen,or causing too much pressure on the human body's face.In this paper,by analyzing the existing DPV related equipment,a dynamic diver DPV multi-body coupling model considering rigid body dynamics and hydrodynamics is established,and the numerical simulation of the underwater navigation process of the diver driving DPV is carried out by star CCM+software,using the overlapping grid and dfbi six DOF body model motion method.In the CFD part,seven kinds of straight-line navigation conditions are firstly carried out.The disturbance potential components of the flow field caused by the change of human body's attitude at different speeds are analyzed,and the relationship between the disturbance potential and the rapidity of DPV is also analyzed,then the optimal human driving attitude of navigation performance is determined.After that,nine heave motion conditions are carried out to verify the efficiency of different control methods and their speediness to human posture and horizontal direction.Finally,the shape of DPV and its impact on human body against incoming flow impact are verified by numerical simulation.In the experiment part,a full-scale DPV self-propelled model is designed,and a pool experiment is carried out by diver driving.By taking several image capture feature points from divers and thrusters,the relative position of each frame is captured by high-speed camera,and the rod model is formed by image processing,and the rod angle and human posture change process are recorded.The vertical displacement is recorded by depth meter,and the rationality of the numerical simulation results of straight-line navigation is verified by comparison.Diver propulsion vehicle(DPV)is a kind of small propulsion vehicle which carries divers at high speed underwater.The diver can grasp or ride on the DPV and operate the propeller to rotate for high-speed underwater navigation.The traditional numerical optimization method regards the diver and DPV as a relatively fixed rigid body to optimize the overall rapidity.But the actual situation is that the human body will have active or passive movement changes when the DPV is rising,turning and changing speed.It is a complex dynamic change process,which has a huge impact on the rapidity and heading stability of DPV.In contrast,the propeller profile and general arrangement also have an impact on the human body's posture during navigation:the DPV with too fast speed has problems such as the wake attacking the human body's abdomen and the excessive pressure on the face.