关键词: 通气气泡, 气液两相, 螺旋桨尾流, 不稳定性机理, 数值分析

Abstract: With the rise of bubble lubrication technology in transport ships, the impact of bubble flow on propeller wake has become increasingly important. This article is based on the SST k - ω DES turbulence model and volume fraction equation, combined with slip mesh technology to conduct numerical research on the dynamic characteristics of propeller wake in bubbly flow. The validation of the KP505 propeller flow numerical model is carried out. Based on the evolution mechanism of propeller wake in multiphase inflow, a propeller wake evolution model is proposed. This model can accurately simulate the evolution process of propeller wake and reveal the triggering mechanism of propeller wake instability. The radial ventilation position affects the strength and dissipation of the tip vortex and hub vortex of the propeller. Ventilation at the axis causes the hub vortex to expand and connects the tip vortex to form a vortex ring in the far field; The ventilation position moves towards the wing tip, and the vortex system at the wing tip accelerates and rapidly dissipates.

Key words: air injection bubble, gas liquid two phase, propeller wake, instability mechanism, numerical analysis