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박종석(Jong-Seok Park),전철균(Chul-Kyun Chun) 한국연소학회 2007 한국연소학회지 Vol.12 No.3
A theoretical model was developed for rotary kiln and computational study was conducted to find the effect of feeding characteristics. One dimensional model with the variations of heating distribution, length of heating zone, excess air ratio and revolution was considered. The comparison of parallel-flow rotary kiln with that of counter-flow was conducted. For parallel-flow type, it is found that the variation of temperature of solid is not great for the zone that is following flame-heating zone. This zone is good to take the special treatment because thermal deviation is small and contacting time is enough for another treatment. Increase of excess air ratio have the effect of decreasing solid temperature. But this effect of decreasing solid temperature goes small for the great excess air ratio. The heating is efficient for the flame which has the maximum heating at the central region of the full length.
왕상(Wang Shuang),전철균(Chul Kyun Chun) 한국자동차공학회 2012 한국자동차공학회 지부 학술대회 논문집 Vol.2012 No.5-2
A computational study on the fire in compartment rooms which are connected in serial have been carried out. The central room and two neighbouring rooms exchange gases through openings and the fire takes place at the bottom of central room. The positions of openings were considered as the prime parameter affecting the characteristics of fire. The result shows that the reverse flow is found around the lower part of openings which locates between the burning room and neighbouring rooms. The developing of reverse flow is fast in the case of upper openings. As the opening goes down to the lower position, the developing of reverse flow is delayed.
냉각핀 형상에 따른 타이어 사이드월의 표면온도 저감 효과 예측에 관한 연구
박재현(Jae Hyen Park),정성필(Sung Pil Jung),정원선(Won Sun Chung),전철균(Chul Kyun Chun) 대한기계학회 2016 大韓機械學會論文集B Vol.40 No.4
타이어의 반복적 변형과 노면과의 마찰은 열발생을 야기하여 타이어의 온도를 상승시킨다. 이 온도 증가는 타이어 손상을 가져오는 요인이 될 수 있다. 이 같은 온도 상승을 억제하고자 타이어 측면에 냉각핀을 적용하고, 이에 따른 냉각 효과를 규명하는 것이 본 연구의 목적이다. 이를 위하여 8개의 냉각핀 형상이 검토 되었으며, 냉각핀 형상에 따른 사이드월 표면 온도 저감 효과를 수치해석적 분석을 통해 규명하였다. 또한 핀 후류에서의 와류에 의한 유동특성과 열전달특성을 비교하였다. The friction and deformation of a tire causes heat generation, which causes a temperature rise of the tire. This temperature rise can be a source of tire damage. The object of this study is to investigate the cooling effect of the application of a fin to the tire side to suppress the temperature rise. Eight different fin shapes were considered, and the sidewall surface temperature reduction owing to the cooling fin shape was numerically analyzed. In addition, the flow characteristics and heat transfer characteristics of the vortex of the pin rear were compared.
박재철(Jae-Cheol Park),김성윤(Sung-Yoon Kim),박재현(Jae-Hyoun Park),최주형(Joo-Hyoung Choi),김정환(Jeong-Hwan Park),전철균(Chul-Kyun Chun) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.10
To investigate the pinwheel type's wing is suitable for wind power turbine of a compact horizontal axis, We tried to perform data processing interpretation and review pinwheel's fluid characteristic. The pinwheel's perimeter inside fluid is divided into floor and superior. The fluid which is from side wing in floor vicinity proceeded toward wing tip. Seeing the axis of rotation in the inside of pinwheel's bulge at the fluid superio. It made vortex by itself counterclockwise. The air current which runs into pinwheel was dashed against floor and was converted like shape of the surface of a wall jet. Some portions flowed into side wing, some portions dispersed along the wing's open side.
전철균 국립7개대학공동논문집간행위원회 2005 공업기술연구 Vol.5 No.-
A combustion model for the PRF(processed refuse fuel) suspended in furnace is developed. It is assumed that each piece of PRF has a shape of disk and burns independently. Each piece of PRF contains moisture, volatile, fixed carbon and ash. Arrhenius equation is used for analyzing thermal decomposition and fixed-carbon combustion. A computational analysis based on developed model is conducted to predict the characteristics of suspended PRF. The variation of diameter, thickness and gas temperature are used as a parameter. It is found that the velocity of suspension of PRF can be predicted with this model. The combustion rate, burning time and residence time can be predicted also. It is predicted that the suspension condition is more sensitive in vertical disk than horizontal disk.
전철균 木浦大學校 工業技術硏究所 1996 工業技術硏究誌 Vol.6 No.-
Explosion caused by the leak of gaseous fuel is a serious problem today. To avoid the accident, safe depletion of the leaked fuel is very important. Depletion of leaked fuel by ventilation through windows of room was studied numerically. It is found that the role of recirculation flow between main stream and fuel layer is very important. This flow moves from the location near intake window to that of exhaust window repeatedly and enhances the mass transfer of fuel to vetilation stream. Height of intake window causes fast exhaust of fuel is low. Initially, volume of ignitable mixture is large for the case of high windows, but this volume becomes large for the case of low intake window at the later time.
자연대류가 존재하는 함수장방형 용기내의 고체/액체 상변화 현상에 관한 실험적 연구
全哲均,姜在一 木浦大學校 工業技術硏究所 1994 工業技術硏究誌 Vol.4 No.-
An experimental study on the phenomena of solidification of water in a cavity cooded from its top surface and heated from its lower surface is reported. Interface of solid and liquid regions, volume of pour out, inverse of density, the effects of initial temperature of water and the hot wall temperature during the solidification are investigated. The rate of solidification is less effected by the intial temperature of water in a cavity than those of the hot wall temperature. When the hot wall temperature is near 4°C the shape of interface is nearly pararell to the surface of heat transfer, but between 7°C and 8°C the interfaces are different from the case of 5°C. The volume of pour out is larger at low initial water and hot wall temperature than at hight. With increase in the Stefan number, the rate of solidification became weak and convection is more accelerated than conduction. The characteristics of the flow and temperature fields are also carefully examined by checking the temperature variation in a cavity.