Underwater Acoustic Missile Movement Characteristics And Explosive Power Analysis

Underwater sound bullet launched by submarine,it plays fighting roles when arriving in the target area,so it's underwater movement characteristics and explosive capacity characteristics are the main focus of the research.This thesis adopted the method of combining the theoretical analysis and numerical simulation and test,to research the characteristics of underwater movement and the explosive capacity of the underwater sound bullet.The research conclusions can provide theoretical supplements and technical support to physical design of the underwater sound bullet?improve underwater moviong ability and explosive capacity so on.First of all,establish the projectile water movement model of the flow field,we research the projectile water movement characteristics of Reynolds number is 106 that base on DES simulation model of S-A,gettint the average drag-coefficient and the strouhal number and lift-coefficient of the projectile,getting and research the karman vortex street phenomenon and the water flow field characteristics around the projectile,and compared with the known test results?Finally we research underwater projectile are in condition of higher Reynolds numbers that to the influence of average drag-coefficient and the strouhal number of relations and the projectile section number and flow velocity of drag coefficient and the influence of the strouhal number.The research conclusions can provide to structural design of underwater sound bullets and to analyze the motion characteristics.In the research of underwater explosin,The model of the signal propagation rule is studied,getting the propagation rule of underwater explosin.Setting the simulation model of the one charge and dual charge,compared and analyzed the spreading characteristics,getting the influence of the energy to the shock wave duration time,research the differents characteristics of dual charge in differents delay time.Setting simulation modetl to research bubble pulse physical process,make sure AUTODYN in simulatiing bubble pulse physical process is accuracy.On the basis of this,we analysis of the influence of depth on the bubble pulse period and the bubble pulsation maximum radius.Do a single explosive and the continuous explosion experiments,analyze the experiments,getting explosion sound-pressure level of single explosive and continuous explosion.Wavelet change is used to study the acoustic signal energy distribution.Using Welch methods to get the Underwater explosion shock wave power spectrumen.In continuous explosion experiments,we studied the time interval how to influence the sound pressure level and the time interval is how to influence the spectrumen.The research conclusion can provide a references and basis to the explosive capacity of underwater sound bullets.In research of the explosive capacity of column power underwater,through the analysis several differents length-diameter ratio column-type charge underwater explosive force field,and compared with the equal mass of sphere charge,concluding the column type charging and spherical charge far-field shock wave equivalent relationship,coupled with p.Kurt empirical formula obtained column type charging power formula,and formula is derived for the test to prove the formula is scientific.These conclusions can provide reference and basis for calculating the underwater explosive capacity of the column charge of the underwater sound bullets.