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

该项目的主要目标是为不同类型的空化开发被动空化控制方法，并减轻它们对水翼的不良影响。有鉴于此，我们打算实施中尺度(数量级或小于一毫米)规则或不规则的墙体结构。将使用适当的加工技术(铣削、变形切割、爆炸或等离子喷涂)来生产各种表面纹理。几个物体，包括基准水翼和螺旋桨和水翼的实验室原型(缩小模型)，具有不同的表面形态，将在单独的空化隧道中进行试验，采用现代全景技术进行高时间和空间分辨率的两相流诊断。实验将在攻角、空化数和雷诺数的大范围内进行，并伴随着相同流动条件(模型尺度)和全尺度下基于PANS方法的数值模拟。在数值计算和实验结果的基础上，详细研究了这种壁面结构对不同类型的流体动力空化的形成和发展以及与之相关的流动湍流结构的影响。

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.