Plenary Lecture

Advanced Cooling Technology for Designing Hot Components in Gas Turbine

Professor Hyung Hee Cho
School of Mechanical Engineering
Yonsei University
Seoul, Korea
E-mail: hhcho@yonsei.ac.kr

Abstract: Since the invention of the gas turbine engine, it has been regarded as an appropriate alternative for traditional power generating systems such as coal fired steam plant and diesel power plant. The foremost advantage of gas turbine over other combustion engines is its prominent thermal efficiency. Its simple cycle efficiency has been increased up to 40% and the combined cycle efficiency exceeds 60% in these days. The principle of higher efficiency of gas turbine engine is the higher operating temperature compared to that of others. Similar to the other thermal power generation systems, power output and thermal efficiency of the gas turbine engine proportional to its operating temperature which means that higher firing temperature offers higher performance.
For that reason, a lot of attempts have been made to raise its operating temperature therefore major parts in advanced gas turbine engine such as combustor, nozzle and blade are exposed to extremely high temperature which exceeds melting temperature of its material. Therefore, cooling is essential element for designing of high performance gas turbine engine and various advanced cooling methods were developed to protect gas turbine parts from high temperature environment. For example, internal cooling, impingement cooling and film cooling method are applied most of the recent gas turbine engines. However, as cooling technology is applied, large temperature gradient is presented in on parts and it could induce thermal stress, which is major cause of failure in gas turbine engine. Moreover, the strength of material is deteriorated in high temperature condition so that the turbine parts are more vulnerable to the thermal stress in operation. Hence, designing method for hot components plays a key role in developing gas turbine engines to guarantee its performance and service lifetime.
In this lecture, the advancement of cooling technology and thermal design process for hot components is introduced. In terms of cooling technology advancement, details of cooling methods will be covered from single cooling element to combination of each cooling elements referring experimental study in the laboratory. In addition, general heat transfer characteristics on turbine components are also introduced based on experimental results. Finally, designing method for advanced cooling is demonstrated which is aiming reduced metal temperature as well as thermal stress for hot components in gas turbine engine.

Brief Biography of the Speaker: Hyung Hee Cho received Ph.D. degree in mechanical engineering from the University of Minnesota, Minneapolis, USA in 1992. Since 1995, he has been with Yonsei University, Seoul, Korea, where he is professor in the Department of Mechanical Engineering. Currently, he is the president of Korean Society for Fluid Machinery and he is also a fellow of American Society of Mechanical Engineers.
Some Distinctions:
1995~ Professor, Dept. of Mechanical Engineering, Yonsei University
2003~05 Chairman, Dept. of Mechanical Engineering, Yonsei University
2005~07 Associate Dean, College of Engineering, Yonsei University
2012~14 Director, Yonsei Institute of Green Technology
2012~ Director, Innovation Center for Engineering Education
1998~ Scientific Council Member, Int. Center for Heat and Mass Transfer
2008~ Editorial Board, Advances in Mechanical Engineering
2008~ Associate Editor, International Journal of Fluid Machinery and Systems
2009~ Fellow, ASME
2010~11 Editor in Chief, Journal of Fluid Machinery
2014~ President, Korean Society for Fluid Machinery
2014 Conference President, 15th Int. Symp. on Transport Phenomena and Dynamics of Rotating Machinery

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