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박경석,원종필,정동화,Park, Kyoung-Suk,Won, Jong-Pil,Jung, Dong-Hwa 대한기계학회 1998 大韓機械學會論文集B Vol.22 No.8
This paper describes a theoretical model developed for analyzing the heat transfer of automotive cooling systems. From the model, heat transfer rate of automotive cooling systems can be predicted, providing useful information at the early stages of the design and development. The aim of the study is to develop a simulation program for automotive cooling system analysis and a performance analysis program for analyzing heat exchanger. Heat release rate from combustion gas to coolant through cylinder wall in engine cylinder was analyzed by using a two zone combustion model. This paper studied how cooling condition would affect engine heat release rate and measured temperature distribution of coolant in water jacket.
자동차 냉각 시스템에 사용되는 thermostat 용 wax 의 제조 및 분석에 관한 연구
박경석,정석진 ( Kyoung Suk Park,Suk Jin Choung ) 한국공업화학회 1996 공업화학 Vol.7 No.1
자동차 엔진용 thermostat에서 냉각수 온도제어를 위해 사용되는 wax의 제조 및 성분 분석을 실시하였다. 제조된 시료에 대해 lift 실험을 실시해 본 결과, 용제 추출법에 의해 제조된 시료가 자동차 엔진용 thermostat으로 사용 가능한 범위내에 있게 됨을 알 수 있었다. 또한, 원유의 pitch를 용제 추출한 후 감압 증류 및 산처리를 하면 보다 정밀한 wax를 제조 할 수 있음을 알 수 있었다. The component analysis of wax for detecting temperature in automobile thermostat of the automotive engine and manufacture of it with distillation and solvent extraction were progressed. From the lift test results of prepared samples, it was found that the solvent extracted samples were in the proper range for use as an automobile thermostat of the automotive engine. And more accurate wax could be manufactured by high vacuum fractional distillation and acid treatment after solvent extraction from crude oil pitch.
박경석(Kyoung Suk Park),김동현(Dong Hyun Kim),허형석(Hyung Seok Heo),박세종(Se Jong Park),손성만(Sung Man Son) Korean Society for Precision Engineering 2006 한국정밀공학회지 Vol.23 No.3
Recently air pollution has become an important issue. So, as the number of vehicles increases, the noise pollution has become one of the most serious social issues nowadays. It is a muffler, which is one of the vehicle components, that has the hugest impact on the noise from the vehicle. And it also has a direct influence on the engine performance. So lately the research is proceeding on the semi-active muffler which can control the back pressure variably by setting up the exhaust variable valve in the baffle to improve its internal structure. The inner parts of muffler which consist of a baffle, pipes and etc. appear to have the complicated turbulence phenomena by the pulsational wave of an unsteady state in the engine and by the structural characteristics of the inner parts. To analyze these phenomena, it is required to have an analysis of its constant quantity and quality. Therefore this study is to analyze with PIV measurement which can analyze the time and space variables, not with the point measurement method like former multi-point anemometer. It is to suggest proper design variables which need to make internal structure of the muffler improve though comparison between the passive type muffler and the semi-active muffler by fabricating a muffler which can be visualized.
평면 레이저 유도 형광법 ( PLIF ) 을 이용한 CH4 / O2 / N2 예혼합화염의 NO 농도 분포 가시화에 관한 연구
박경석(Kyoung Suk Park),이세환(Sei Hwan Lee) 한국분무공학회 2001 한국액체미립화학회지 Vol.6 No.3
In this study, quantitative measurement of nitric oxide concentration distributions visualization were investigated in the laminar CH₄/O₂/N₂ premixed flame by Planar laser-induced fluorescence (PLIF). The NO A-X (0,0) vibrational band around 226nm was excited using a XeCl excimer-pumped dye laser. Selecting an appropriate NO transition minimizes interference from Rayleigh scattering and O₂ fluorescence. The measurements were taken in CH₄/O₂/N₂ premixed flame with equivalence ratios varying from 1.0∼1.6, and a fixed flow rate of 3slpm. NO was found to produce primarily between an inner premixed and an outer nonpremixed flame front, and total NO concentration is raised when equivalence ratios increase. These results suggest that prompt NO is likely to contribute to NO formation in CH₄/O₂/N₂ premixed flame. Furthermore, this trend was well matched with previous works.
박경석(Park Kyoung-suk),한성철(Han Sung-chul),이동진(Lee Dong-jin),오현석(Oh Hyun-seok) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Lately new regulations regarding harmful exhaust gases and fuel economy have bee enforced. The major research focuses on the reduction of exhaust gases and improvement of fuel economy. In order to achieve that alternative fuel as well as a lean bum combustion were used.<br/> Lean burn combustion has problems mainly related to the unstable combustion condition, as a result of the ignitability defect, low pressure and heat loss due to combustion period expanding. For that reason spark ignition process, air fuel mixture flow and satisfied charge of combustion chamber need to be improved. The major factor of designing lean bum combustio<br/> engine is to prevent misfire.<br/> Recently research has focused on ultra lean bum combustion engine as it produces misfire. The reason for that is the increase in tile air to air fuel mixture ratio, which is adjusted from 30: 1 to 50: 1. To solve this problem, spark plug of traditional engine should be improved. Further more the location should be adjusted.<br/> Tltis research analyses a method of combustion, when stratified charge is ignited with LPG. Further more we investigated the combustion field using thermocouple which is self-manufactured. As a result, the results present the optimum condition of ultra lean bur combustion characteristics.
스파크 점화 기관에서의 이상연소특성에 관한 실험적 연구
박경석(Kyoung Suk Park),손성만(Sung man Son),장석형(Suk Hyoog Jang),한성철(Sung Chul Han) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
The suction pressure of abnormal condition gasoline engine becomes smaller and residual gas increase than normal combustion. It is caused by the distribution of inequable air in a cylinder. And then, it is birthed to an abnormal combustion. In this case is continued, the engine crush out caused by increasing of engine heat loss.<br/> In this study, we tested to grasp combustion characteristics of normal condition gasoline engine and abnormal condition gasoline engine. This test is willing to set a basic data's analysis for develop an automotive diagnosis system by analyzing pressure in the cylinder, output signal of MAP Sensor, Exhaust gas, etc.
박경석(Kyoung-Suk Park),정동화(Dong-Hwa Jung),김철(Chul Kim) 한국자동차공학회 1999 한국 자동차공학회논문집 Vol.7 No.2
In this study, empirical formula was suggested, which estimate not instantaneous but average cooling loss, by calculating and experimenting the heat transfer rejection from combustion chamber to coolant, using 1500cc DOHC. To take the friction loss of the engine affecting on cooling loss into consideration, the friction loss of piston fields was included into the empirical formula. As a result, when excluding the friction loss, average 16% of difference was shown by the comparison between empirical formula and experimenting result, but when considering the friction loss, the difference came near to average 3%. Thus in prediction of average cooling loss, the friction loss of piston fields should be considered as a necessary factor.<br/>