Whole-field Flow Measurement at Very Large and Very Small Scales with Innovative Particle Image Velocimetry
报告人:
University of Minnesota, USA, Dr. Jiarong Hong
Jiarong Hong is an assistant professor in Mechanical Engineering Department and Saint Anthony Falls Laboratory at University of Minnesota. He received his M.S. and Ph.D. from Johns Hopkins University in 2008 and 2011, and started his career in University of Minnesota in 2012.
报告时间:
2017-06-01 14:30
报告地点:
李兆基科技大楼A260会议室
主办单位:
热能系
简介:
The talk will present two examples in which innovative flow diagnostic methods have led to new insights and can potentially yield fundamental advancement in the important areas of fluid mechanics. Specifically, I will discuss the innovation in tracer-imaging-based whole-field flow quantification under two challenging settings. In one case, we developed super-large-scale particle image velocimetry and flow visualization, using natural snowflakes as tracers, to obtain in situ measurement of turbulent flows in the wake of a 2.5 MW wind turbine and in the atmospheric boundary layer at a scale on the order of 100 m. Such measurements revealed a series of interesting physical processes occurring in the full-scale turbine wake and under the atmospheric environment, providing unique insights into the optimization of wind farm operation and the forecast of snow accumulation in future. In the other case, we advanced particle tracking velocimetry based on digital inline holography for high-fidelity quantification of 3D wall-bounded turbulent flows, particularly, the flow over surfaces with rigid and compliant roughness. This development not only offers a powerful and highly adaptive 3D flow measurement approach with a compact setup and at significantly lower cost compared to other state-of-the-art 3D PIV techniques, but also provides new perspectives on the influence of roughness dynamics on turbulent flows.
