Numerical Analysis of Pulsation Characteristics of the Submerged Water-jet Flow Field
In order to analyze the pulsation characteristics of submerged waterjet flow field,the front-stator and rear-stator waterjets were taken as the objects,and the numerical simulation of transient flow field of the waterjet working after the ship was completed;the pulsating pressure and pulsating thrust characteristics of the duct,stator and rotor were analyzed.The results showed that for the front-stator waterjet,the thrust of the stationary components is mainly generated by the duct,and the pressure pulsation on the duct inner wall is much larger than that of the stator.Affected by the interaction between the rotor and the stator,the flow field pulsation in the interaction area between the duct and the rotor is the strongest and reflects the characteristics of the rotor.For the rear-stator waterjet,the influence of the stator on the inflow of rotor is weakened,so that the pulsating flow field of each component reflects the rotor characteristics,and the amplitude of rotor pulsating force increases.According to the analysis results of pulsating flow field of submerged waterjets with different structure forms,the pulsating flow field of rear stator waterjet is lower than that of front stator waterjet;Moreover,the pulsating flow field characteristics of the front stator waterjet is more com-plex than that of the rear stator watejet thruster,which is not conducive to the noise reduction design.
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