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남정길 한국마린엔지니어링학회 1998 한국마린엔지니어링학회지 Vol.22 No.6
In this paper effects of resonator within intake manifold system on volumetric efficiency were investigated n the 4-cylinder and 4 stroke Diesel Engines. The effects of resonator system were analyzed on resonant speed and on volumetric efficiency for a complicated intake system with resonator was confirmed. And the optimum design method of the resonant system which had the overall high and flat characteristic of volumetric efficiecncy was proposed.
남정길,최주열 木浦海洋大學校 2000 論文集 Vol.8 No.1
In order to achieve good performance characteristics for a charged engine it is essential that turbocharger matching is to be carried carefully. Until now, we have depended on overseas maker and engine consulting co. for turbocharger application to our engine, so it is difficult to respond field needs quickly. To improve current situation, we have developed a turbocharger matching program on the base of energy balance equation of turbocharger. Calculation output data was compared to the raw data of engine test to evaluate the accuracy of the program. As the results, good correlations between calculation of program and experiment, was confirmed.
남정길,김준효,최주열 木浦海洋大學校 2001 論文集 Vol.9 No.1
According to the NOx level requirement of annex Ⅵ to IMO(International Maritime Organization) MARPOL 73/78, this regulation shall apply to each diesel engine with a power output of more than 130 kW which is installed on a ship constructed and undergoes a major conversion on or after 1 January 2000. It is inevitable to adopt IMO standard for marine engines. Therefore, most of diesel engines which are being currently built should be tested and surveyed in accordance with the NOx technical code. In this paper, various technics of NOx reduction methods were investigated for the diesel engines and the methods of NOx measuring were introduced by the new and simplified field detecting equipment. These results can be utilized for the basic design and developement of diesel engine for NOx reduction.
Diaphragm과 중간 두께 Boss를 한장의 마스크를 사용하여 제작하는 기술
남정길,김현철,전국진 경북대학교 센서기술연구소 1997 센서技術學術大會論文集 Vol.8 No.1
In this paper, the technique for realizing a bossed diaphragm using only one mask is proposed. The bossed diaphragm is composed of diaphragm and medium-thick boss. This technique uses vertical corner compensation method to prevent the diaphragm widening phenomenon. Vertical corner compensation method is realized by adding compensation strips at the edge of a SiO_(2)/Si_(3)N_(4) web patterned for making a medium-thick boss.
남정길,Nam Jeong-Gil 한국마린엔지니어링학회 2005 한국마린엔지니어링학회지 Vol.29 No.6
The effects of a WI(Water Injection) at the intake Pipe and an urea injection at the exhaust pipe for a 4-cylinder DI(Direct Injection) diesel engine were investigated experimentally The water quantity was controlled by temperature of intake manifold and MAF(Manifold Air Flow). In addition, the urea quantify was controlled by NOx quantify and MAF. Effects of WI system, urea-SCR system and tandem system were investigated for with and without EGR(Exhaust Gas Recirculation). As the results. the SUF(Stoichiometric Urea Flow) and NOx map were obtained. In addition, NOx results can be visualized with engine speed and engine load. It was concluded. therefore, that the NOx reduction effects of the tandem system without the EGR were more than those with the EGR base engine.