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Alberto Mucci,Foster Kwame Kholi,Hariharan Kallath,Thierry Sibilli,June Kee Min(민준기) 한국전산유체공학회 2020 한국전산유체공학회지 Vol.25 No.1
Experimental studies on gas turbines face severe difficulties in obtaining an accurate and representative model of the internal environment. High temperature and pressure in the core flow require specific test rigs to guarantee the safety and representativeness of the experiment. Moreover, complexities arise when testing novel designs. Due to increasing concerns about flying gas turbines environmental footprint, the Advisory Council for Aeronautics Research in Europe (ACARE) proposed a reduction in aircraft emissions. From a concept proposed by the NEW Aero Engine Core (NEWAC) grant, we developed a methodology to test a novel Cooled Cooling Air Heat Exchanger (CCAHX) system at real steady-state operative conditions. The method involves the creation of one- and three-dimensional Computational Fluid Dynamics (CFD) models to support the experiment and verify the safety of the testing environment. The study presents the steps required to achieve this test, which involves the correct definition of an ε-NTU method for the one-dimensional model and a correct design of the three-dimensional exchange model. Additionally, the CFD model provides insight into the CCAHX operations, showing the temperature gradient inside the bulk structure and inducing further studies on the unit. The experiment reached the required temperature reduction and induced testing in case of a cooling failure to verify the structural safety of the CCAHX device.