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반복 열하중을 받는 자동차용 열교환기의 열적 거동 특성에 관한 실험적 연구
송필곤(Pilgon Song),배성민(Seongmin Pae),차용길(Yongkil Cha),김광일(Kwangil Kim),서재성(Jaeseong Seo) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
Aluminum brazing heat exchangers can be used at high temperature and pressure conditions. So it has been widely used in automotive engine cooling system with excellent performance. However, it has the potential to cause failure from large thermal loads and it may be give adversely affects to the system at the structural point of view. Therefore analyzing behavior characteristics and failure mode under extreme operating conditions are very important for heat exchanger design and manufacturing. In this paper, dynamic strain is measured at the predicted points of failure using electric resistance type strain gage. An infrared thermal imaging camera and thermo-couple sensors are used to measure gradient and changing of temperature as time goes by. Therefore, material behavior characteristics at the point of failure are analyzed from measured strain and temperatures during the thermal cycle test. Furthermore, serge and core-plugging phenomenon that affect the durability is observed.