高速气泡艇阻力数值模拟及气泡减阻效果分析

Numerical evaluation of the resistance reduction effect for three-dimensional high-speed air cavity craft

考虑到复杂界面流动的需要,基于三维非稳态的Navier-Stokes方程,采用有限体积法进行数值离散,VOF方法处理自由面和艇底喷气后的气液流场,在应用分区结构化网格划分技术的基础上,建立了高速气泡艇阻力数值模拟方法。应用该方法对不同气泡艇方案的阻力进行了数值模拟,详细分析了不同气腔形式、不同喷气量、喷口位置及数量对减阻效果、气泡覆盖、压力分布和自由面兴波情况的影响规律,为高速气泡艇方案的进一步优化设计提供了技术支撑。

The total resistance of high-speed air cavity craft in different speeds is numerically simulated by solving RANS equations with SST k-ωturbulence models. VOF method is used to deal with free surface and gas-liquid flow field of the craft bottom. Computed results including free surface wave and pressure distribution are presented. The effect of artificial cavity shape and air-jet velocity on resistance is analyzed. The drag reduction efficiency in different conditions is compared. The results are helpful for understanding the complex flow phenomenon of air cavity craft and optimizing the artificial cavity shape geometry shape.