关键词: 喷水推进, 数值模拟, 喷射流尾迹, 尾迹场噪声

Abstract: A mixed-flow pump equipped on a high-speed ship has been studied by using the Reynolds-Averaged Navier-Stokes (RANS) method combined with the Lighthill acoustic analogy equation based on the STAR-CCM+ software. The jet wake field and the noise characteristics corresponding to different immersion depths are studied by adjusting the ship draught. The numerical simulation method of the integrated flow field of the ship and pump and the noise calculation method of the jet wake field are established for the mooring condition. The influence of the jet immersion depth on the wake is investigated by the simulation of the flow field. It is concluded that the underwater jet has less energy dissipation and weaker wake flow characteristics than the surface jet, and reduced hydrodynamic noise with the increase of the immersion depth after complete immersion. It can provide significant references for the development of the water-jet propulsion and even the comprehensive ship stealth technology.

Key words: water-jet propulsion, numerical simulation, jet flow wake, wake noise