Characteristic research on the flow and sound fields of the pump-jet-propelled submarine under cruising conditions
To determine the flow and sound field distribution laws of a pump-jet-propelled submarine under cruising conditions,the unsteady numerical calculation of the entire basin was conducted based on the detached eddy simu-lation turbulence model,and the acoustic FEM was used to predict the flow-induced noise.Test noise and thrust information were analyzed using the hydrophone and thrust acquisition system in a circulating water channel.Re-sults showed that the influence of the external flow field on the jet flow field at the tail of the pump jet decreases gradually with the increase in the speed of the ship,and a blockage is detected in the local area of the pump-jet propulsor.The impeller-induced noise is the most important source of hydrodynamic noise.The frequency spectrum characteristics of impeller noise are similar to those of pressure pulsation in the flow field.The SPL caused by pres-sure fluctuation on the flow wall has a dipole symmetry distribution on the meridian plane,whereas the noise distri-bution of the quadrupole jet has a certain uniformity on the sagittal plane.Moreover,a maximum is detected along the jet flow direction on the meridian plane.This study reveals the complex flow processes and the distribution laws of various flow-induced noises under cruising conditions,which provide a certain theoretical basis and technical support for the design and performance optimization of the pump-jet propeller with high efficiency and low noise.
pump-jet-propelled submarineflow field characteristicssound field characteristicscruise conditionjet flowacoustic FEM
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