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염정국(J.K.Yeom),탁영조(Y.J.Tak),이상석(S.S.Lee),하종률(J.Y.Ha) 한국자동차공학회 1992 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In spite of economical efficiency, high reliability, a excellent chracteristic of generating power, internal combustion engine has problem of environmental pollution. Because of such reason, CO, HC, particulate and NOx must be reduced and the technique of combustion analysis need. This study aims to compare heat release by ensemble average of the existing method .with a consequence get by least squares method for pressure data. This paper proposes heat release computation method that can analyze combustion phenomenon of close the most truth straight, simple.<br/> In conclusion, we found that the least squares method of third-order fits computational method of heat release very well.<br/>
디젤엔진에서 화염온도의 계측을 통한 soot의 농도와 운전조건과의 관계연구
이선봉,이태원,탁영조,정성식,하종률 동아대학교 공과대학부설 생산기술연구소 1997 生産技術硏究所硏究論文集 Vol.2 No.1
The local instantaneous flame temperature and soot concentration in a D.I. diesel engine were measured using a two-color method. The proposed method based on the continuous spectral radiation from the soot particles in the flame is applicable to industrial diesel engines without major modifications of their main characteristics because of simplicity and relative ease of application. Measurements were performed at two location inside the combustion chamber of a D.I. diesel engine. Effects of different engine speeds and loads, fuel injection timings, combustionn chamber shapes on flame temperature and KL factor, which is qualitatively proportional to soot concentrations, were examined. Flame temperature change were observed with increasing engine speed and load. The higher the flame temperature is, the lower the KL factor is.
박종상,이태원,이상석,탁영조,정성식 동아대학교 공과대학부설 생산기술연구소 1998 生産技術硏究所硏究論文集 Vol.3 No.1
When CWM is suddenly exposed in the high temperature surroundings, the intermal water evaporates and then each droplet builds up pores. Besides, porosity rate changes along the temperature of surroundings, the composition ratio of CWM, and the initial diameter of droplet. Concentrating on porous structure of CWM, this study has proceeded to acquire the basic data on the CWM injection combustion and closely examinate the effects of the first stage combustion on the whole combustion by measuring the diameter variations, the mass fraction burned, and the pore rate of CWM droplet. The results demonstrate that 60∼70% of initial mass is reduced during water evaporation and volatile combustion period, and swelling rate, mass faction burned, and density variation are greatly concerned with atomozation of CWM.