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공랭식 인터쿨러 성능에 영향을 미치는 인자들에 대한 실험적 연구
오광헌(Kwang-hun Oh),정순안(Sun-an Jeong),전태수(Tae-soo Chun) 한국자동차공학회 2019 한국자동차공학회 부문종합 학술대회 Vol.2019 No.5
To increase the power and torque of the vehicle engine, mount the turbocharger using the exhaust gas discharge pressure. In this system, the air cooled type charge air cooler(ACAC) is required to efficiently cool temperature rise in the process of compressing outside air. In this study, the performance factors of the air cooled type charge air cooler(ACAC) were analysed experimentally. And depending on the vehicle mounting position, SBS and Brick types were selected for the test. Our study analyzed the effects of factors affecting performance, such as offset rate and fin bonding ratio. The heat rejection and cooling air pressure drop by offset ratio and fin bonding ratio respectively did not affect up to 90%. However, the design should be considered as it affects the durability aspects of the fin bonding factor. In addition, heat rejection by offset ratio depends on the sample specification, but there is a possibility that 30-50% is appropriate.
LP EGR용 인터쿨러 내식소재 선정에 대한 실험적 연구
이동석(Dong-suk Lee),오광헌(Kwang-hun Oh),정순안(Sun-an Jeong),이찬우(Chan-woo Lee) 한국자동차공학회 2019 한국자동차공학회 부문종합 학술대회 Vol.2019 No.5
In the LP EGR system, acidic condensate is formed on the inner surface of the intercooler. It was reported that acetic acid, formic acid, sulfuric acid, nitric acid and the like were detected in this condensate. In order to increase the corrosion resistance of intercoolers to the acidic environment, the 5-layer clad material was examined instead of the existing 3-layer clad materials. The 5-layer clad material is a multilayer clad material having a sacrificial layer between the filler alloy layer for brazing and the core alloy. In particular, we wanted to compare the corrosion resistance characteristics according to the difference in composition of the alloy constituting the sacrificial layer. In this study, the pressure resistance and corrosion resistance assessment were performed which is generally selected for development of intercoolers. And corrosion resistance to acidic environments was evaluated using solutions of the VDA K3.2 standard. This test method was proposed by VDA for evaluating corrosion characteristics of condensate generated in the LPEGR system. The 5-layer clad materials met the general requirements for pressure and corrosion characteristics of the intercooler. In addition, the 5-layer clad materials were shown significant characteristics under the acid corrosion test than the 3-layer clad material, and the corrosion life of the intercooler is expected to increase in the LP EGR system.