부산대학교 도서관

To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.apm.2006.10.008 Byline: Kyros Yakinthos (a), Dimitris Missirlis (a), Achilles Palikaras (a), Paul Storm (b), Burkhard Simon (b), Apostolos Goulas (a) Keywords: Heat exchanger; Recuperative aero engine; Porous medium; Exhaust nozzle; Computational fluid dynamics Abstract: Today the needs for safer, cleaner and more affordable civil aero engines are found to be of great importance. Five years ago, the EU initiated an action for the design and the construction of efficient and environmentally friendly aero engines (EEFAE). One of the major European gas turbine industries, MTU, has presented a new technology for an advanced aero engine design, which uses an alternative thermodynamic cycle. The basis of this cycle is the adoption of a recuperation part with the use of a system of heat exchangers, installed in the exhaust nozzle of the aircraft engine. Thermal energy in the turbine exhaust is used in the recuperator to pre-heat the compressor outlet air before combustion. The benefits of this technique are focused on reduced pollutants and decreased fuel consumption. In this work, the procedure of the optimization of this installation, by means of the imposed pressure drop downstream the aircraft engine and the balanced mass inflow to the heat exchangers is presented. The optimization is based on experimental measurements in laboratory conditions and preliminary 2D CFD modeling for the flow inside the exhaust duct and through the heat exchangers. It is shown that with a careful approach, a better arrangement of the heat exchangers can be achieved in order to have a minimum pressure drop in the exhaust nozzle which can positively affect the engine's performance. Author Affiliation: (a) Laboratory of Fluid Mechanics and Turbomachinery, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece (b) MTU Aero Engines, GmbH, 80995 Munich, Germany Article History: Received 1 February 2006; Revised 1 August 2006; Accepted 1 October 2006