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김남호(Namho KIm),정재우(Jaewoo Chung),강정호(Jungho Kang),서주봉(Jubong Seo),강수영(Suyoung Kang) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Turbocharger technologies are regarded as a key technology to realize engine downsizing for CO2 reduction of IC engine. But, a commercialized turbocharger test bench is so expensive to various researches on the turbocharger development and applications in a research lab. So, in this paper, easy turbocharger test method are proposed and test results are verified with reference data of a commercialized turbocharger. Proposed test system and test methods could be simplified using turbocharger mean-value models. And, it was found from the result that benchmarking turbocharger"s compressor performance could be evaluated in about 10% .
대응출력에 따른 선박용 과급기에 의한 디젤기관의 배출특성 비교 연구
김봉환,이치우,안국찬 한국기계기술학회 2014 한국기계기술학회지 Vol.16 No.4
This is a thesis about the experiment of comparison characteristic of exhaust gas in the same condition between diesel engine that is equipped turbocharger to increase effectiveness of the engine which is recently used in a lot of industry which requires high power. Resulting of the experiment turbocharger diesel engine according to response power, difference in low speed is not significant, but in high speed, effectiveness of turbocharger diesel engine is almost the same in four turbocharger. In other hand, in exhaust gas experiment, high response power turbocharger model exhausts less NOX, but it doesn’t significantly affect the result when it comes with decreasing of CO2 and effectiveness of similar power characteristic. As a result, the high response power turbocharger diesel engine is economically effective comparing with the low response power turbocharger diesel engine
대응출력에 따른 선박용 과급기에 의한 디젤기관의 배출특성 비교 연구
이치우,안국찬,김봉환 한국기계기술학회 2014 한국기계기술학회지 Vol.16 No.4
This is a thesis about the experiment of comparison characteristic of exhaust gas in the samecondition between diesel engine that is equipped turbocharger to increase effectiveness of the enginewhich is recently used in a lot of industry which requires high power. Resulting of the experimentturbocharger diesel engine according to response power, difference in low speed is not significant, but inhigh speed, effectiveness of turbocharger diesel engine is almost the same in four turbocharger. Inother hand, in exhaust gas experiment, high response power turbocharger model exhausts less NOX, butit doesn’t significantly affect the result when it comes with decreasing of CO2 and effectiveness ofsimilar power characteristic. As a result, the high response power turbocharger diesel engine iseconomically effective comparing with the low response power turbocharger diesel engine.
대응출력에 따른 선박용 과급기에 의한 디젤기관의 배출특성 비교 연구
이민형(Minhyoung Lee),이기봉(Kibong Lee),이원욱(Wonuk Lee),이치우(Chiwoo Lee) 한국자동차공학회 2013 한국자동차공학회 지부 학술대회 논문집 Vol.2013 No.11
This is a thesis about the experiment of comparison characteristic of exhaust gas in the same condition between diesel engine that is equipped turbocharger to increase effectiveness of the engine which is recently used in a lot of industry which requires high power. Resulting of the experiment turbocharger diesel engine according to response power, difference in low speed is not significant, but in high speed, effectiveness of turbocharger diesel engine is almost the same in four turbocharger. In other hand, in exhaust gas experiment, high response power turbocharger model exhausts less NOX, but it doesn’t significantly affect the result when it comes with decreasing of CO2 and effectiveness of similar power characteristic. As a result, the high response power turbocharger diesel engine is economically effective comparing with the low response power turbocharger diesel engine.
정진은(Jin-Eun Chung),노호종(Ho-Jong Roh),정재우(Jae-Woo Chung),강우(Woo Kang) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In order to overcome known problems of turbocharged engines, such as, turbo lag and boost threshold, current research is going towards the usage of various combinations of several turbochargers. A good example is the two-stage turbocharged diesel engine. Therefore the research which predicts the performance of two-stage turbocharged diesel engine is carried out. AMESim/IFP Engine Library of Imagine are used for the performance simulation. Specifications and performance maps of turbochargers which are made by some theory and experiments are used. The time constant(63%) of two-stage turbocharged diesel engine when the engine speed is changed from idling to 1500 rpm was 1.2 seconds, which is short 6.9 seconds compared with 8.1 seconds of single-stage engine. This shows the transient response of two-stage turbocharged diesel engine is improved compare with that of the single-stage.
정진은(Jin-Eun Chung),정동영(Dong-young Jeong),정재우(Jae-Woo Chung),강우(Woo Kang) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Today, tight and contradictory demands concerning the performance, the exhaust quality and higher milage require the complex system in the engine, such as the combinations of turbochargers. In this engine the control becomes more difficult, Therefore the simple and accurate model for the turbocharger is necessary. This paper deals with the prediction of the compressor performance. The universal curve for flow map and Jenson-Kristensen method for the efficiency map are used. To verify these maps, some measurements were carrying out on the test bench and compared with the results of simulation. As a result of comparison, we can show that the error is inside 5% and it is possible to make 2nd equation compressor performance. Also model using AMESim & IFP engine library is similar to predicted values using universal curve and Jenson-Kristensen method.
김다정(Da Jeong Kim),곽효서(Hyo Seo Kwak),성한샘(Han Saem Sung),김재열(Jae Yeol Kim),엄태진(Tae Jin Eom),김철(Chul Kim) 대한기계학회 2018 大韓機械學會論文集A Vol.42 No.9
스윙게이트 밸브는 디젤엔진 선박의 터보 과급기로 유입되는 배기가스를 제어하는 역할을 수행한다. 기존의 밸브는 디스크와 몸체 사이의 간극이 없어 불완전 연소 시 생성되는 불순물로 인해 디스크가 고착되어 원활한 개폐가 어렵고 디스크에 처짐이 발생하여 밸브 개폐 시 몸체에 스크래치가 발생한다. 이에 본 연구에서는 디스크의 고착 방지를 위하여, 밸브가 닫혀 있을 때 현장에서 요구하는 누설 허용량 5% 이내를 만족하는 간극 범위를 결정하였다. 밸브의 전체 두께는 설치공간의 제약으로 인해 고정되어 있으므로 결정된 간극에 따라 플랜지와 몸체의 두께를 설계하였고, 이를 통해 밸브의 경량화를 이루었다. 또한, 디스크의 형상 및 두께 설계를 통해 디스크 처짐으로 인한 스크래치를 저감시켰으며, 상기의 과정을 거쳐 설계된 스윙게이트 밸브에 대하여 진동하중에 따른 구조안전성을 검증하였다. The swing gate valve controls the exhaust gas flowing into the turbocharger installed on the diesel engines of ships. The conventional swing gate valve has no clearance between the disc and the body parts to which the impurities generated during incomplete combustion can adhere. As a result, opening and closing the valve can be difficult. In addition, deflection of the disc causes scratching when the valve is opened or closed. In this study, a clearance within the allowance leakage (5%) has been determined to prevent the valve from sticking to the body parts as the valve closes. The thickness of the body and flange parts were designed according to this calculated clearance, and the design of the disc leads to a reduction in scratch formation. Finally, the structural safety of the proposed model was evaluated under vibration loads.
디젤자동차용 웜업촉매 내의 유동장에 미치는 터보차저 및 배플의 영향에 관한 수치해석
최병철(Byungchul Choi),정우남(Woo-Nam Juhng),위대웅(Daewoong Wi),강창혁(Changhyuk Kang),Liu Bao 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Diesel vehicle is growing in importance in light-duty sector as a way of reducing greenhouse gases due to improved fuel economy. Carbon monoxide, gas-phase hydrocarbon and organic fraction of diesel particulates can be oxidized to harmless products using a diesel warm-up catalyst (WCC). This study investigated the effect of a turbocharger and a baffle on flow fields and temperature distributions in the WCC for Diesel vehicles by a numerical analysis. In the case of the WCC with the turbocharger, velocity vectors and temperatures of inlet of the WCC have the relatively homogeneous distributions by the swirl generated from the turbocharger. Velocity vectors and temperatures of inlet of the WCC with the turbocharger and the baffle have the improved distributions in homogeneity compared with the case of the WCC without the baffle. The homogeneous flow field and the temperature distribution in the WCC may contribute to improve the conversion performance of the catalysts.
Tier 4 배기규제 만족을 위한 오프로드 엔진 전처리 기술 및 배출가스 특성에 관한 연구
김훈명(HoonMyung Kim),한다혜(DaHye Han),강정호(JeongHo kang),표수강(SuKang Pyo),정학섭(HakSup Jung) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
Due to problems such as environmental problems caused by toxic exhaust emissions from internal combustion engines, the regulations on off-road diesel engines are being tightened and pre-processing and post-processing technology to meet the requirements of the regulations are being developed at the present. This study applied the improved turbocharger that increased the supercharged pressure of the turbocharger, which is a pre-processing technology, to identify the characteristics of the increase of the supercharged pressure. In addition, the characteristics of the emission gas based on the control of the injection timing and the EGR rates were analyzed. When equipped with the improved turbocharger, it was identified that the THC, CO and smoke decreased and the NOx was increased in comparison to the existing turbocharger. It was further identified that the NOx was reduced due to the ultimate increase of the EGR.