Kyoungdoug Min
Seoul National University 기계공학부 · Engineering
김경덕 교수의 연구실은 내연기관의 배기가스 배출 메커니즘과 연소 효율 향상을 핵심으로 하며, 특히 스퍼지(crevice)가 스파ark-ignited(SI) 엔진의 수소화합물(HC) 배출에 미치는 영향을 심층적으로 연구하고 있습니다. 또한 고성능 디젤 엔진의 분할 주입 연소 메커니즘과 두드러진 폭발 연소(knocking) 현상의 사이클별 분석을 통해 연소 안정성과 효율성을 동시에 향상시키는 기반 기술을 개발하고 있습니다. 전기화학적 임피던스 분석 및 전극 반응 거시적 분리 기법을 활용한 PEM 연료전지 성능 분석도 연구 영역에 포함되어 있습니다.
Figures are computed from collected data and may differ slightly.
<div class="htmlview paragraph">To understand the effects of crevices on the engine-out hydrocarbon emissions, a series of engine experiments was carried out with different piston crevice volumes and with simulated head gasket crevices. The engine-out HC level was found to be modestly sensitive to the piston crevice size in both the warmed-up and the cold engines, but more sensitive to the crevice volume in the head gasket region. A substantial decrease in HC in the cold-to-warm-up engine
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1994.
Abstract Engine-out HC emissions were measured in SI engine experiments in which the piston topland crevice size was changed systematically. For a warmed-up engine, the HC emissions were found to be modestly sensitive to the piston crevice size-a 10% change in size results in approximately a 2% change in HC emissions. This low sensitivity is explained in terms of a crevice HC diffusion/oxidation model in the expansion process. When the piston crevice is sufficienlly small, however, the model sho
The knock phenomenon is one of the major hindrances for enhancing the thermal efficiency in spark-ignited engines. Due to the stochastic behavior of knocking combustion, analytical cycle studies are required. However, there are many problems to be addressed with regard to the individual cycle analysis of in-cylinder pressure data. This study thus proposes novel, comprehensive and efficient methodologies for evaluating the knocking combustion in the internal combustion engine. The proposed method
The separation of resistances during their measurement is important because it helps to identify contributors in polymer electrolyte membrane (PEM) fuel cell performance. The major methodologies for separating the resistances are electrochemical impedance spectroscopy (EIS) and polarization curves. In addition, an equivalent circuit was selected for EIS analysis. Although the equivalent circuit of PEM fuel cells has been extensively studied, less attention has been paid to the separation of resi
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