This paper presents a novel method for measuring three-dimensional (3D) water surface dynamics in a partially filled pipe. The study on investigation of the 3D free surface dynamics in partially filled pipes is very limited. The method involves tinting the water white with titanium dioxide so that the water surface appears like a solid surface to image-based measuring systems. This method uses a high-resolution projector to project a stochastic pattern of light onto the water surface and uses two high-resolution cameras to capture the pattern on the deformed water surface. The 3D instantaneous water surface fluctuation can be computed from the images captured by the two cameras using a standard Digital Image Correlation algorithm. It is demonstrated that the surface dynamics parameters of turbulent flow in partially filled pipes, including surface fluctuations and surface velocity, can be measured using the projector, high-resolution cameras and DIC algorithm.

本文提出了一种测量部分填充管道中三维 (3D) 水面动态的新方法。对部分填充管道中 3D 自由表面动力学的研究非常有限。该方法包括用二氧化钛将水染成白色，使水表面看起来像基于图像的测量系统的固体表面。该方法使用高分辨率投影仪将光的随机图案投射到水面上，并使用两个高分辨率相机捕捉变形水面上的图案。可以使用标准数字图像相关算法从两个相机捕获的图像计算 3D 瞬时水面波动。证明了部分填充管道中湍流的表面动力学参数，