Experimental characterization of pit-turbine hydrodynamics

在高雷诺数(大型工业规模)下，描述复杂气动和流体动力物体后尾迹随时间变化的三维脱落是一个巨大的挑战，因此在本研究项目中，将开发一种新的扫描测量方法来提取大体积上的这种信息。具体地说，将在位于皇后大学的光学拖曳水池中使用时间分辨的立体粒子图像测速仪测量各种用于水电的坑式水轮机的水动力性能。在这里，模型尾迹将通过高速系统激光系统重建，以便在一次通过中可以获得30厘米乘30厘米乘3米的大物理体积的速度场。所有实验都将作为更复杂几何形状的概括(不包括遮盖物或涡轮机本身)，以便更多地了解这种三维脱落的性质，并提供一个通用数据库来验证计算模拟，该数据库随后可用于优化基础。

Characterizing the time-dependent, three-dimensional shedding of wakes behind complex aerodynamic and hydrodynamic bodies is a great challenge at high Reynolds numbers (large industrial scales), and so in this research project a new scanning measurement process to extract this information over large volumes will be developed. Specifically, the hydrodynamic performance of a variety of pit-turbine bodies for hydropower are to be measured using time-resolved, stereoscopic Particle Image Velocimetry in an optical towing tank located at Queen's University. Here the model wakes will be reconstructed via a high-speed system laser system such that large physical volumes of the velocity field on the order of 30cm by 30cm by 3m can be obtained in one pass. All experiments will be kept as generalizations of the more complex geometries (without shrouding or the turbine itself) in order to understand more about the nature of this three-dimensional shedding as well as provide a general database to validate computational simulations, which can then be used later for the basis of optimization.