Numerical Study On Full-scale Underwater Vehicle Self-propulsion Based On Structural Overset Grids

Submarine self-propelled hydrodynamic characteristics are a comprehensive field of submarine rapidity prediction and design.Full-scale submarine self-propelled simulation research is the inevitable trend of the current CFD high-speed development,which can explore the hydrodynamic performance of the model scale and full scale submarine self-propelled differences,so that may be more accurate correction effect of the scale of the submarine self-propelled,designed for submarine quickness to lay a certain data with theoretical basis.The hydrodynamic characteristics of model scale and full scale SUBOFF submarine with ISEAN E1619 propeller are calculated and analyzed by using the full structured grid and the self-developed CFD software,HUST-SHIP.The first submarine propeller open water resistance and grid independence,independence and the time step and then drag of submarine and the scale of the nominal wake effect has carried on the calculation and analysis,found the increase of number of submarine mayor can result in viscous pressure resistance coefficient and friction coefficient decreases,and tail for submarine wake,the wake fraction of full scale will be smaller than the model scale.The unevenness of the wake field at the propeller disk surface decreases with the increase of the Reynolds number,and the four wake peaks also decrease with the increase of the Reynolds number,which is conducive to reducing the cavitation phenomenon and exciting force of the propeller.Type of ISEAN E1619 propeller under a given speed coefficient of open water performance and scale effect are calculated,and the K_T、K_Q and₀ increases with the increase of screw scale by comparing.The numerical simulation of model scale and real scale self-propelled submarine is carried out,and the hydrodynamic coefficient of self-propelled submarine is analyzed,compared with the K_T、K_Q and₀ of foreign research data,it shows that the self-propelled submarine scale calculation data in this paper is accurate.The pressure curves of propeller blades and blade sections with different radii of model-scale submarine are analyzed.The velocity cloud maps of the two plates X=1.03l and X=0.97l at the tail of the submarine self-propelled are compared and analyzed,and the influence mechanism of the data difference and scale effect between model scale and real scale self-propelled is explained from the perspective of flow field and pressure.