期刊名称：Bulletin of the Institute of Heat Engineering
印刷版ISSN：2083-4187
出版年度：2018
卷号：98
期号：1
页码：121-126
语种：English
出版社：Warsaw University of Technology
摘要：This paper presents a thermal analysis of elements of the exhaust system of the redesigned airplane I-23. In order to improvethe thermal performance of the exhaust system and decrease thermal loads inside the engine bay, modifications of the initialgeometry of the cover pipe were proposed. This pipe shields the nacelle interior from thermal interaction and direct contactwith the hot exhaust pipe. Several openings were created in its wall to increase the mass flow rate of the cold air sucked infrom the nacelle interior to the gap between the exhaust pipe and its cover due to the ejector effect. Then numerical modelswere developed and simulations for flight conditions were carried out for the original and modified exhaust systems. Theresults obtained for both geometries were compared, showing that openings in the cover duct resulted in a high mass flowrate flowing through the gap between exhaust pipe and its cover and a lower exhaust pipe temperature. Even though thenumber, locations and cross-section area of the openings were selected arbitrarily, better thermal performance was obtainedfor the modified exhaust system.
