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인터쿨러 탱크에서 과급공기 압력차이에 관한 실험적 연구
오광헌(Kwang-hun Oh),이상준(Sang-Jun Lee),강병훈(Byeong-hun Kang),심호창(Ho-chang Sim) 한국자동차공학회 2022 한국자동차공학회 부문종합 학술대회 Vol.2022 No.6
As internal combustion engine vehicles are being converted to eco-friendly vehicles these days, hydrogen fuel cell vehicles (FCEVs) are attracting attention as next-generation eco-friendly vehicles. In addition, the parts that can be commonized among some parts of internal combustion engine vehicles can be refined and applied to eco-friendly vehicles to use current production technologies. Similar to the intercooler currently used in turbocharging systems, hydrogen fuel cell vehicles also require an air cooler that can cool high air temperatures by being compressed in an air compressor. In this study, pressure fluctuations were measured in intercooler tanks. The shape of the inlet tank shall be improved for the distribution of charged air from the test results. However, in terms of the pressure drop of the charged air, we could know the need to improve the shape of the outlet tank. From these experiments, depending on the environment that is applied to the actual vehicles, it can help referentially to improve the air cooler design.
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.
김철주,강환국,오광헌 한국에너지학회 1995 에너지공학 Vol.4 No.2
본 연구에서는 밀폐형 2상 열사이폰의 액체 Pool에서 발생하는 핵비등현상과 유동영역에 대해 가시화 방법으로 연구하였다. 실험용 열사이폰은 스텐레스와 유리관을 이용하여 제작하였으며, 열공급은 증발부 주위에 설치된 유도 가열용 코일에 고주파를 가함으로써 스텐레스 외면에 발열이 일어나도록 하였다. 이에 따른 결과는 다음과 같다. 실험용 열사이폰은 고주파 가열등 열사이폰의 작동성능을 저해하는 여러 요인들이 포함되어 있었으나, 실험결과 이러한 문제는 실험 내용에 영향을 미칠만큼 크게 나타나지 않았다. 열속과 상당압력의 범위는 각각2<q"<25kW/$m^2$, 0.1<Pv<11.bar이었으며, 이러한 구간에서 증발부 Pool내부에서의 비등 Regime은 다음과 같은 형태로 나타났다.-Pulse boiling Regime: 증기 기포핵이 발생될 때까지 긴 Waiting period가 존재하며, 핵비등이 발생할 때에는 증기 기포의 폭발적인 성장으로 Blow-up현상이 나타난다.-천이 비등 Regime: 원형의 증기 기포가 Pool의 중단부에서 2~3개 점으로 분산되어 발생하며, Pool의 상단에서는 기포들이 크게 성장하여 Bubbly 또는 Churn flow형태를 이룬다.-연속 핵비등 Regime: 증기 기포핵의 발생점이 가열벽면 전 구간에서 균일하게 분포되며, 전 구간이 Bubbly flow형태를 이룬다. 열속이 증가할수록 기포의크기는 작아진다.작아진다.
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.
차량 난방 성능 향상을 위한 하이브리드 PTC 히터 적용에 관한 연구
구중삼(Jungsam Gu),오광헌(Kwanghun Oh),정순안(Sunan Jeong),왕윤호(Yoonho Wang) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
Recently internal combustion engine’s efficiency has been improved dramatically from customer’s demand that is to get car of good fuel efficiency. But air conditioning side is necessarily lacking the heat source for heating cabin room due to the decreased waste heat from engine. For this reason, PTC heater has used as auxiliary heater. PTC heater was being applied to diesel engine to improve early thermal comfort in cold start and the application is being expanded into gasoline engine as well. In conventional PTC heater, HVAC package size increases due to separated structure from coolant heater. Also temperature distribution and heating performance decrease because PTC heater cannot cover overall effective area. So there is a demand of new technology which can improve heating performance. In this paper, the hybrid PTC heater’s heating performance is validated. The hybrid PTC heater consists of conventional coolant heater and new PTC heater with thin profile. In the structure, two heaters are integrated into one assembly with no gap. The hybrid PTC heater can compensate waste heat loss and improve HVAC package size.
김명회(Myunghoe Kim),구중삼,오광헌(Kwanghun Oh),장병무(Byeongmoo Jang),배종식(Jongsik Bae),Junmo Ku 한국자동차공학회 2015 한국자동차공학회 부문종합 학술대회 Vol.2015 No.5
Recently Car-maker has improved efficiency of engine because customers prefer car with increased fuel efficiency For this reason, PTC heater has been applied with diesel engine since past 10 year for heating performance. Furthermore heat source continually reduced in Gasoline engine because of improvement of gasoline engine efficiency. So PTC heater is also applied to Gasoline engine. Recently trend is to increase using of PTC heater. Like this PTC heater of auxiliary heater has been transformed into the main heater. But PTC heater has increasing HVAC package. Also, PTC heater has increasing temperature distribution and decreasing heating performance because cold air is bypassed. This paper is about studying hybrid PTC heater that is improved about disadvantages of PTC heater. Hybrid PTC heater is composed of an efficiently combination of thin PTC heater with coolant heater core. This paper presents experimental results of heating performance test at vehicle level. As a result, Hybrid PTC heater could improve interior temperature of vehicle about 0.9℃~3℃