Invited talk notice

1.    Title:

“Roughness Effects in an Axial Compressor Cascade”

2.    Speaker: Professor Seung Jin SONG

(漢城國立大學 機械和航空工程學院, 韓國)

3.    Date and time: 4:00PM - 5:00PM, 2009年 7月 14日(Tuesday)

4.    Venue: 航天航空學院 Seminar Room 208

5.    Summary:

Compressor blades experience significant surface degradation with service. Elevated levels of surface roughness reduce compressor efficiency and mass flow rate. This talk presents measurement of compressor blade performance degradation due to blade surface roughness. Performance tests have been conducted in a low-speed, linear cascade with roughened compressor blades. Equivalent sandgrain roughnesses of 12, 180, 300, 425, and 850 microns have been tested. Flow angle, flow rate, and loss have been measured. For the tested roughnesses of 180, 300, 425, and 850 microns, the axial velocity ratio decreases by 0.1, 2.1, 2.5, and 5.4 %, respectively. Also, the loss increases by 12, 44, 132, and 217 %, respectively. Thus, among the three parameters, the loss responds most sensitively to changes in compressor blade roughness.

6.    Biography:

Dr. Song received his B.S. in Mechanical Engineering and Materials Science from Duke University, USA in 1986, and S.M. and Sc.D. in Aeronautics and Astronautics from MIT, USA in 1988 and 1995, respectively. Since 1999, he has been at the School of Mechanical and Aerospace Engineering at Seoul National University. His current research interests include aerodynamics and fluid-structure interactions in turbomachinery, analysis of propulsion/power generation systems, electrohydrodynamics, and related areas of fluid mechanics and renewable energy.

7.    Inquiry: Dr. Tongbeum Kim (金東範 138-9194-1189)