Research On The Characteristics And Improvement Measures Of Submarine Hydrodynamic Wake

The hydrodynamic wake of wake field induced by disturbance is easy to be detected when submarine is submerged in density stratification and its vicinity.It is of great significance to study the mechanism of wake field and sea surface free surface characteristics of submarine in stratified fluid,and to seek the corresponding wake control methods.Based on the principle of computational fluid dynamics(CFD)and the numerical simulation method,the drag experiment of Taylor pool egg is reproduced.The numerical results are compared with the wave making data of the drag experiment of the model at the same speed,and the effectiveness and accuracy of the turbulence model,wall function and related parameter settings for free surface wake capture are verified.In order to analyze the wake characteristics of submarine motion in ocean stratified flow more comprehensively,considering the mathematical relationship between wave making slope and remote sensing scattering characteristics,a spectrum analysis method of sea surface wake based on the principle of irregular wave decomposition is proposed.This method can effectively separate the different frequency and phase components of free surface waves induced by submarine motion.Combined with the time domain wave pattern analysis method,the influence of ocean layered environment,hull configuration and other factors on submarine wake stealth performance can be investigated from multiple angles.Around the typical marine stratified environment state,the VOF multiphase flow model is used to realize the strong stratified state environment of fluid.Combined with the energy conservation equation,the density current model based on temperature is constructed to realize the continuous stratified state environment of fluid and the mixed stratified state environment with linear thermocline.Based on the above verification,numerical simulation and spectral analysis methods,a layered environment model is established,and the SUBOFF model is used as the parent model to carry out the numerical research on the spatial-temporal evolution and geometric variation characteristics of the wake induced by real-scale submarine underwater navigation in different layered environments.According to the range of navigation parameters and hull scale characteristics of multi type submarines at home and abroad,the influence of main navigation parameters such as submarine depth and speed on the temporal and spatial morphological evolution characteristics of internal interface wave and free surface wave in strong layered environment is studied;the influence of hull shape parameters such as length and hull diameter on the geometric morphology of internal interface wave and free surface wave caused by volume effect disturbance is explored The influence on submarine wake control performance is revealed.It provides a multi-dimensional prediction for the characteristics of hydrodynamic wake induced by submarine and other underwater vehicles,and provides a new reference for the optimization scheme and avoidance strategy of the main body design.Finally,the coupling mechanism of appendage configuration scheme on the characteristics of internal wave wake and sea surface wake is investigated,and the difference of wake control performance between cross rudder and X rudder is compared,and the effective technical scheme of wake control is obtained.In view of the layout and configuration design of the command platform shell,the realizable technical measures to weaken or even suppress the submarine sea surface wake are put forward.