Cavitation Control using Mesoscale Surface Structuring in Marine Engineering and Hydraulic Systems

本项目的主要目标是针对不同类型的空化现象开发被动空化控制方法，并减轻其对水翼的不良影响。考虑到这一点，我们打算实现中等规模（毫米或小于毫米的数量级）的规则或不规则的壁结构。将使用适当的加工技术（铣削、变形切割、爆炸或等离子喷涂）生产各种表面纹理。几个机构，包括基准水翼和实验室原型（按比例缩小模型）的螺旋桨和水翼，具有不同的表面形态将在单独的空化隧道进行测试，采用现代全景技术的两相流诊断与高的时间和空间分辨率。实验将针对攻角、空化数和雷诺数的各种流态进行，并伴随着基于PANS方法的相同流态（模型比例）和全尺寸的数值模拟。基于数值计算和实验结果，这种壁结构的不同类型的水力空化和相关的流动湍流结构的起始和演变的影响将被详细研究。

The main objective of this project is to develop passive cavitation control methods for different types of cavitation and to mitigate their undesirable effects on hydrofoils. With this end in view, we intend to implement mesoscale (of the order of or less than a millimeter) regular or irregular wall structuring. Various surface textures will be produced using appropriate processing technologies (milling, deformational cutting, detonation or plasma spraying). Several bodies, including, benchmark hydrofoils and laboratory prototypes (scaled-down models) of propellers and hydrofoils, with diverse surface morphologies will be tested in separate cavitation tunnels employing modern panoramic techniques for two-phase flow diagnostics with high temporal and spatial resolutions. The experiments will be performed for a wide range of flow regimes on the angle of attack, cavitation number and Reynolds numbers and accompanied by numerical simulations based on PANS approaches for the same flow conditions (model scale) as well as for full-scale. Based on the numerical and experimental results, the effects of such wall structuring on the inception and evolution of different types of hydrodynamic cavitation and the associated flow turbulence structures will be investigated in detail.