ABSTRACT

Measuring flow depths in free-surface turbulent flows can be challenging due to their fast dynamics and the presence of aeration. This study analyses the suitability of a low-cost sensor, the Intel® RealSense™ D435 RGB-D camera, for characterization of a highly aerated case study: the hydraulic jump. As with all instrumentation, special care must be taken to ensure accurate measurements. In this case, two different methods to calibrate depth estimations (accounting for set-up and any instrument precision) are presented, both leading to similar results. The main advantage of the presented instrumentation is its capability to measure 3D surfaces with high temporal and spatial resolution. Results are presented primarily in 2D in order to evaluate the flow depth estimation quality of this new technique with 2D data available in literature. The employed sensor showed a similar level of uncertainty as previous, well-established instrumentation for the study of free-surface elevations, amplitudes and frequencies of turbulent fluctuations.

摘要

由于自由表面湍流的快速动态和曝气的存在，测量它们的流动深度可能具有挑战性。本研究分析了低成本传感器英特尔® 实感™ D435 RGB-D 摄像头的适用性，用于表征高度充气案例研究：水跃。与所有仪器一样，必须特别小心以确保准确测量。在这种情况下，提出了两种不同的深度估计校准方法（考虑到设置和任何仪器精度），都导致了相似的结果。所提出仪器的主要优点是它能够以高时间和空间分辨率测量 3D 表面。结果主要以 2D 形式呈现，以便使用文献中可用的 2D 数据评估这种新技术的流动深度估计质量。