【摘要】 基于计算流体力学（CFD）方法,采用Euler-Euler双流体模型,对于在平板底部喷气形成的薄气层,进行减阻数值模拟研究,探讨不同空气流量和均匀来流速度下气液两相流的气层形态。结果表明：Euler-Euler双流体模型能准确捕捉气液界面流动态演化的过程和清晰展示气层形态。气层随均匀流向后方延伸,宽度逐渐增加,存在一个横向扩散角。喷气流量和均匀流速度的协同作用显著影响气层形状和它的覆盖范围。随着喷气速度的增加,在一定的空间范围内气层横向扩散角增大,气层宽度和含气率也随之增大;与之相反,气层扩散角、气层宽度和含气率随着均匀流速度的增加而减小。总结了喷气速度和均匀流速度对气层宏观形态的影响规律,为气层减阻技术应用于实船提供了可行性分析。更多还原

【Abstract】 This study numerically investigates air layer drag reduction on a flat plate model using the computational fluid dynamics(CFD) method with the Euler-Euler two-fluid model. The morphology of the air layer in the air-liquid two-phase flow under different airflow rates and incoming flow velocities is examined. The results indicate that the Euler-Euler two-fluid model accurately captures the dynamic evolution of the air-liquid interface, clearly revealing the air layer morphology. The air layer width gradually increases along the streamwise direction, exhibiting a lateral diffusion angle. The synergistic effect of the air jet velocity and the free-stream velocity will significantly influence the shape and coverage of the air layer. Within a certain range, as the air jet velocity increases, the lateral diffusion angle, width, and air holdup of the air layer also increase. Conversely, increases in the free-stream velocity reduce the diffusion angle, width, and air holdup.This study provides a feasibility analysis for the application of air layer drag reduction technology to actual ships.更多还原