报告题目：Current trends in aeroacoustic testing in DNW and in TU Delft

主讲人：Georg EITELBERG

报告时间：2017年11月29日(周三)13:30

报告地点：新主楼第1报告厅

报告内容简介：

In order to reduce fuel consumption, novel propulsion concepts are evaluated alongside with refinements of the existing propulsive techniques. In a systematic approach, the generation of noise is evaluated alongside with the propulsive performance. This combination is the driver for most of our current testing at DNW and at TUD. The acoustic testing falls into three somewhat overlapping main categories: 1) Localization of noise sources; 2) Directivity of the sources; 3) Interaction of acoustic sources with the aircraft. In recent two decades, the acoustic array has been the main tool for noise source localization. The capabilities and limitations will be discussed with the help of a few characteristic examples. For source directivity, tests in DNW are performed in the free jet tunnel configuration in order to obtain far-field data. The directivity testing of installed propulsion noise relies on the test providing appropriate similarity with the free flight conditions. A test on engine noise shielding funded by the EU Commission in the framework of CleanSky serves as an example of a well-planned test. The interaction of the rotor with static structures (pylons, wings and swirl recovery vanes) forms a challenge both in terms of conventional noise as well as in terms of the acoustic waves interacting with solid surfaces and possibly exciting structure-borne noise. Examples of experimental work performed at TUD, determining the interaction noise and verifying the possibilities to reduce it, will be discussed.

主讲人简介：

Georg Eitelberg obtained the degree of Dipl.-Ing. (graduate engineering qualification) from the UniversityofKarlsruheinGermanyin 1980 and the degree of Dr.-Ing. from the same University in 1983 for work performed as research scientist at the DLR in Göttingen, Germany. After a brief sojourn at the DLR Division of Space Utilization in Cologne, he worked as a lecturer inthe Department of Mechanical Engineering of the Australian Defense Force Academy (ADFA), Canberra, Australia. Resigned in 1989. Already in 1988, he had been appointed head of the High Enthalpy Tunnel Project in DLR Göttingen. He followed with appointments as Head of the Aerothermodynamics Branch and Head of the Wind Tunnels Division in the DLR. He appointed (managing) Director of the DNW (German-Dutch Wind Tunnels - a joint entity founded by the national aerospace laboratories of Germany and The Netherlands) in 1998. He appointed a (part time) Full Professor at the TU Delft Faculty of Aerospace Engineering in 2009 to complement the task of being the Director of DNW.