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임재만(Jaeman Lim),김형욱(Hyunguk Kim),이정원(J.W Lee),황승환(Seonghwan Hwang),민경덕(Kyoungdoug Min) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
Quasi-dimensional combustion model of knock has been developed to predict knock occurrence in heavy<br/> LPG single cylinder engines. BOOST was applied to predict the mass flow into and out of engine. Reduced<br/> kinetic models are used to simulate auto-ignition in the unburned gas region. The model shows the expected<br/> tendency with the variations of intake port system, spark timing, engine speed.
공개공지의 사유화와 공공성 평가 -용인시 사례를 중심으로-
임재만 ( Lim Jaeman ) 한국부동산분석학회 2021 不動産學硏究 Vol.27 No.2
이 논문은 2020년 5월 기준으로 경기도 용인시에 조성된 공개공지 45개소를 대상으로 그 현황과 공개공지의 사유화 정도, 그리고 공공성 정도를 측정한 연구다. 이를 위해 선행연구를 통해 공개공지의 사유화 정도를 측정할 항목을 선택하고, 현장조사를 통해 사유화 정도를 측정했다. 또한 공개공지의 공공성 구성요인의 범주와 각 범주의 중요도를 AHP 방법으로 측정했다. 연구결과는 다음과 같다. 첫째, 용인시 공개공지는 준주거지역과 상업지역에 80%가 집중되어 조정되었다. 둘째, 공개공지 45개소 중 24개소인 54%가 사유화되어있다. 셋째, 45개소의 공개공지 중 26개소가 평균 이상의 공공성 정도를 보이며, 공개공지의 공공성 평가점수가 낮은 곳일수록 공개공지가 사유화 정도가 더 높은 것으로 나타났다. 이 연구는 용인시 각 공개공지의 공공성을 AHP 비교법으로 점수화하여 평가한 처음의 연구로 그 자체만으로 의의가 있다. 표본 수가 적고 단기간 연구라는 점에서 일반화는 곤란하다는 한계를 지닌다. This study investigates the level of privatization and publicity of privately owned public space (POPS) in Yongin City. In May 2020, we select 45 POPS in Yongin through building registers and field surveys, and employ AHP to analyze the publicity of POPS in terms of several perspectives. The results of the survey and analysis show that 80% of the POPS in Yongin are concentrated in quasi-residential and commercial areas, and 54% of the 45 POPS are privatized. We find that 26 of the 45 POPS show higher level of average publicity and the POPS with lower publicity assessment scores have a higher level of privatization. This is the first study to examine the privatization and publicity of POPS in Yongin in terms of scoring them with AHP comparison method. However, the generalization of the results is limited due to the small number of samples and restricted area investigation.
3-D Simulation of Combustion Process of DME Spray under Engine Condition
Jaeman Lim(임재만),Yongrae Kim(김용래),Kyoungdoug Min(민경덕),Woo Kang(강우) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The characteristics of spray. auto-ignition and combustion process of DME (Dimetyl ether) were investigated by 3-D simulation in a combustion vessel under high temperature and pressure conditions and engine conditions. Spray impingement and non-premixed combustion model were developed and incorporated into the computational fluid dynamics code, STAR-CD. Peng-Robinson EOS was introduced to calculate the evaporating rate of DME droplets in high pressure conditions. A Laminar flamelet concept was used to simulate non-premixed combustion. As the chemical mechanism of DME, a skeletal chemical kinetics mechanism which consists of 28 species and 45 reactions was derived by approximation of the detailed mechanism. In comparison with experimental data, the flamelet-concepted combustion model predicted the essential feature of the combustion process and the autoignition characteristics of the DME spray reasonably well for the various initial conditions. Also, the combustion process of the DI engine fueled by DME was simulated and verified by experiment data.
임재만(Jaeman Lim),민경덕(Kyoungdoug Min) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
To improve the engine for development, simulation of combustion phenomena for two-stage injection was done using two-dimensional flamelet combustion model. As the results, the cause of ignition in second injection was the interaction between burned gas originated by first injection and new fresh mixing gas was found. For the research single cylinder engine used in this study, modification for piston bowl shape and spray angle was needed to get the optimized performance using multiple injection scheme. As a result of this study, the combustion model used in this study can be verified to be applied in the design stage of engine using multiple injection.
개량된 2차원 화염편 연소 모델을 이용한 고속 직분식 엔진에서의 다단 분사시 연소 현상 해석
임재만(Jaeman Lim),민경덕(Kyoungdoug Min) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
Ignition delay of second injection of HSDI diesel engine was usually much shorter than that of first injection. It is due to the interaction between radicals generated during the combustion process, and mixed gas of second injection. In this paper, To analyze combustion phenomena of multiple injection mode in HSDI diesel engine effectively, two-dimensional flamelet combustion model was modified. To reduce calculation time, two-dimensional flamelet equations were only applied near stoichiometric region. If this region was ignited, species and temperature of other region were changed to the steady-state solutions of one dimensional flamelet equations. By this method calculation time for solving flamelet equations was reduced to 20 percents, thought the results were almost same. Modified flamelet combustion model was coupled to commercial CFD code interactively using user subroutine.