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기계식 연료펌프를 사용하는 혼소엔진에서 노즐특성에 따른 경유 분사특성 측정
조승환 ( S. H. Cho ),유승헌 ( S. H. Yoo ),이범호 ( B. H. Lee ),김동현 ( D. H. Kim ),이대엽 ( D. H. Lee ) 한국분무공학회 2012 한국액체미립화학회지 Vol.17 No.2
The characteristics of spray behavior and injected amount were studied with two types of nozzles for using in a compression ignition engine with dual fuel technology for construction machines. A penetration length of spray tends to shorten due to a decrease of injected amount of a diesel fuel with dual fuel engine application. In order to ignite the gaseous fuel premixed with air during intake process, a diesel fuel, which was compression ignited, needs to penetrate somehow similar depth compared with the case of a diesel fuel-only-injection. In this work, a nozzle with reduced hole diameter and increased number of holes was tested and demonstrated that, compared to diesel 100% case, its penetration lengths are comparable to 74% and 79%, respectively, of those of 100% and 50% supply of a diesel fuel with the baseline nozzle that has four holes and 30.4% increased diameter. This will presumably enhancement the combustion in a dual fuel engine. A design suggestion was also made in this work to achieve similar penetration length of spray with diesel 100% case to prevent combustion from being deteriorated in a dual fuel engine.
기상 환원제를 사용하는 선택적 환원촉매에서 유동혼합 개선에 관한 연구
고상철(S.C. Ko),이범호(B.H. Lee),조승환(S.H. Cho),이상헌(S.H. Lee),홍성태(S.T. Hong),이대엽(D.Y. Lee) 한국전산유체공학회 2010 한국전산유체공학회지 Vol.15 No.1
Since emission regulations for vehicles have become more stringent, SCR technology has drawn a strong attention in order to reduce NOx emissions. Optimal design of a reductant injection nozzle and a multi-hole plate located between the cone and catalyst is critical in that the uniform distribution of reductant is necessary to maximize the NOx conversion efficiency and minimize the slip of reductant in SCR. In this work, an LPG fuel(C3H8 in vapor state) was used as a reductant for LPG vehicles. A Realizable k-ε model is used for turbulence, and SCR body is defined as porous media with inertia and viscous resistances measured in this work. Effect of the number of nozzle holes on the flow mixing index was analyzed, which revealed that a four hole nozzle shows the best performance in terms of uniformity of flow. An installment of a multi-hole plate at the entrance of catalyst was evaluated with flow mixing index, uniformity of flow, and pressure drop. A multi-hole plate with gradual hole diameter change in three steps showed the best uniformity of flow within the conditions suggested in this work.
박현호(H.H. Park),임설(S. Lim),백기봉(K.B. Baek),장선용(S.Y. Chang),조승환(S.H. Cho) 한국전산유체공학회 2013 한국전산유체공학회 학술대회논문집 Vol.2013 No.5
The Performance analysis of the shutter valve for a thruster is examined by using numerical method. The initial design of shutter shows not enough performance of thrust and shutter torque that are caused high pressure drop near the supersonic nozzle throat. 3 cases of modified shutter design are proposed. Numerical calculation results of these cases are studied in terms of the relation between shutter shape, thrust efficiency and shutter torque.
임설(S. Lim),전영진(Y. J. Jeon),조승환(S.H. Cho) 한국전산유체공학회 2011 한국전산유체공학회 학술대회논문집 Vol.2011 No.5
The aerodynamic characteristics of the L-type side jet thruster are examined by using computational fluid dynamics methods. The critical design points of L-type side jet thruster with bent nozzle by 90degrees are studied in terms of the relation between side jet nozzle geometry and thrust efficiency.
증례 : 아메바성대장염에 유발된 다발성 관절염의 1 치험례
김동준 ( D. J. Kim ),조승환 ( S. H. Cho ),김홍수 ( H. S. Kim ),서주영 ( C. Y. Suh ) 대한내과학회 1968 대한내과학회지 Vol.11 No.4
1. A case of polyarthritis secondary to amebic colitis is reported, and this is considered to be a first case in Korea. 2. The diagnosis of amebic colitis was established by the isolation of the ameba from the stool and the subsequent rapid response of the