Study on Cavitation Characteristics and Induced Noise of Marine Liquid Ammonia Pumps

抄録

To investigate the cavitation and cavitation-induced noise characteristics of liquid ammonia pumps, an experimentally validated numerical simulation method was employed. Analyzed the bubble distribution within the impeller and the pressure pulsation characteristics. Based on numerical calculations of the acoustic field, the radiation noise characteristics of the inner and outer fields excited by the dipole sound sources of the impeller and casing were investigated. Results indicate that cavitation bubbles first appear on the impeller's back side and gradually expand. As cavitation evolves, the amplitude of pressure pulsation within the volute increases.Both the impeller and casing noise sources exhibits dipole directivity. As cavitation evolves, the noise directivity curves follow a pattern of first decreasing and then increasing.