主  办：bt365官网亚洲版

　　    安全与防护协同创新中心

报告题目：Attenuation of a shock save propagating in ducts with grooves and the wave patterns following it

报告人： Prof. John Ekaterinaris

　　Embry-Riddle Aeronautical University, USA

时间：2018年6月6日下午15:00

地点：北京理工大学研究生楼204房间

报告摘要：

　　Experimental investigations and numerical simulations of a shock wave propagation inside ducts with roughness is presented. The roughness is added in the form of grooves. Different shapes are considered in order to better understand the physics behind the evolution of the complex wave patterns resulting from diffraction and reflection of the primary moving shock. The contribution of these phenomena to pressure attenuation is investigated. The numerical method is validated through several test cases, and the results are compared against the theory and the experimental measurements. Excellent agreement between high resolution computations and the experiment is obtained for the shock speeds and complex wave patterns created by the grooves. Time history of pressure at various locations, and shock strengths are compared with the measurements. It is found that accurate pressure prediction requires a close representation of the full experimental setup to fully capture boundary layer development, and pressure losses associated with unsteady moving shocks in long ducts. Different groove geometry has been tested in the numerical simulation in order to identify the shape that will diminish shock strength. Analysis and animations of the computed results are used to reveal salient features of the complex unsteady flow field.