受校国际合作与交流资金和国家自然科学基金项目资助，能源科学与工程学院李彪博士邀请美国普渡大学西北分校刘昀助理教授来我校交流讲学。欢迎感兴趣教师和学生参加。

  报告内容，时间及地点安排如下:

  时    间： 2019年6月18日14:00-15:30、19日9:00-10:30

  地    点：能源学院动力楼J619会议室

  学术报告与讨论：1.悬停鹰娥的升力产生机制 (6月18日14:00-15:30)

                                      2.超空泡的内流场测量 (6月19日9:00-10:30)

  18日报告摘要：The aerodynamic force on flying insects results from the vortical flow structures that vary both spatially and temporally throughout flight. Due to these complexities and the inherent difficulties in studying flying insects in a natural setting, a complete picture of the vortical flow has been difficult to obtain experimentally. In this work, Schlieren, a widely used technique for highspeed flow visualization, was adapted to capture the vortex structures around freely flying hawkmoth (Manduca). Flow features such as leading-edge vortex, trailing-edge vortex, as well as the full vortex system in the wake were visualized directly. Quantification of the flow from the Schlieren images was then obtained by applying a physics-based optical flow method, extending the potential applications of the method to further studies of flying insects. The lift estimation reveals that the flow unsteadiness attributes to over 60% of the overall lift production while the conventional (fixed wing) lift production contributes to less than 30%.

  19日报告摘要：

Ventilated Supercavitation is an effective hydraulic drag reduction method for high speed underwater vehicles. The duration of supercavitation formation is a crucial factor that affects the ranges of the high-speed underwater vehicle. Thus, it is very necessary to understand the flow field inside the supercavity where the ventilated air is transported. This work presents the first internal flow measurement on a ventilated supercavity, shedding the light on the mysteries about the ventilation and leakage mechanisms.

    刘昀助理教授简介:

 刘昀博士现为普度大学西北分校机械工程系助理教授。他于中国科学技术大学近代力学系获学士和硕士学位，2016年获普渡大学（西拉法耶）机械工程博士学位。 2016年至2017年在明尼苏大大学Saint Anthony Falls Laboratory (圣-安东尼瀑布实验室)从事博士后研究。2017年开始在普度大学西北分校任教，现负责流体力学实验室的科研及教学工作，其研究方向涉及扑翼飞行空气动力学、三维流场显示与测量、超空泡、及新能源研究等研究等。发表SCI期刊及国际会议学术论文20余篇。