The steady and unsteady loads acting on a hydrofoil immersed in a turbulent boundary layer have been investigated. Measurements were performed in a cavitation tunnel in which the hydrofoil was mounted from the test section ceiling, via a 6-component force balance. Two NACA0012 hydrofoil models with trapezoidal planforms and aspect ratios of 2.4 and 1.2 were examined. The ceiling turbulent boundary layer was artificially thickened via an array of transverse jets located upstream of the test section. Thickening the ceiling boundary layer allowed for varying levels of hydrofoil immersion (nominally up to 100%) to be studied. In addition to the level of immersion, the effect of varying incidence and Reynolds number on the hydrodynamic loading normal to the chord was also investigated. Steady forces were found to be significantly affected by the relative scale of the boundary layer, particularly in the stall region. A broadband peak in the unsteady normal force spectra was observed at a constant reduced frequency of 0.2. The relative peak amplitude was found to be dependent on the boundary layer thickness to hydrofoil span ratio and Reynolds number. As the incidence is increased past stall, a low-frequency power increase was observed which was superimposed over the existing broadband excitation induced by the ceiling boundary layer.

研究了作用在浸没在湍流边界层中的水翼上的稳态和非稳态载荷。在气穴通道中进行测量，在气穴通道中通过6分量力平衡从测试部分的天花板上安装了水翼。检验了两个具有梯形平面形状和纵横比分别为2.4和1.2的NACA0012水翼模型。顶部湍流边界层通过位于测试部分上游的一系列横向射流人工增厚。加厚天花板边界层可以研究不同水平的水翼浸入（名义上可达100％）。除了沉浸程度外，还研究了入射角和雷诺数的变化对垂直于弦的流体动力载荷的影响。稳定力被边界层的相对尺度显着影响，特别是在失速区域。在恒定的降低频率为0.2的情况下，在不稳定的法向力谱中观察到宽带峰。发现相对峰幅度取决于边界层厚度与翼型翼展比和雷诺数。随着事故的增加，经过停转，可以观察到低频功率的增加，它叠加在天花板边界层引起的现有宽带激励上。