자동차 촉매장치의 유동 특성에 관한 연구

박찬준,이상원 서울産業大學校 2000 논문집 Vol.51 No.2

The flow characteristics in a typical dual-monolith automotive catalytic converter were investigated using a computational simulation method. A non-reacting, adiabatic model was considered in the flow simulation. The monolithic brick resistance was formulated using the experimental pressure drop data. It was introduced as an additional source term into the non-dimensional momentum governing equation within the monolithic brick. The flow distribution within the catalytic converter was found to depend strongly on the diffuser angle. The diffuser angles were varied from 90˚ to 27˚ and a disk was inserted at inlet of diffuser. The inlet flow of catalytic converter was assumed as a uniform distribution and it was varied from 5.9 m/s to 29.5 m/s. A distribution index was formulated to quantify the degree of uniformity at test cases considered. When the angle of the diffuser was decreased from 90˚ to 27˚, the distribution index was increased from r=0.67 to r=0.78. The gap of between dual-monolith had a good effect on uniformity because the radial flow in the gap was increased. Also the disk which was inserted at inlet of diffuser could control the uniformity, but increased the flow restriction.

옥외 조명디자인의 미적 패러다임에 관한 연구 : 국내 리조트타운의 Lighting Fixture Design을 중심으로

박찬준 계원조형예술전문대학 예술공학연구소 1997 계원논총 Vol.2 No.1

Site and environment of outdoor lighting fixture design has physical, physiological and psychological impact. This is because medium known as light can open emotional breadth of human beings broadly with the language of light. Hence in this treatise the writer attempted to study esthetical paradigm of lighting fixture design in connection with control of light which is a motif for variety of human actions and empathy apparent in natural and architectural environment of outdoor resort town. Furthermore it is also attempted to identify symbolic images of conceptual analogy of outdoor lighting fixture design from the perspective of morphology. Practical items, being planned and developed by this writer with a view that outdoor lighting fixture design and creation of environment from the dimension of resort landscape promote spiritual contact between man and nature, were restructured as focus for solution of problems. Accordingly attempt was made to graft self-reflection on lighting fixture designs being installed in uniformity irrespective of site and environment to significance and order of environments in terms of time, place and sight. The significance of this study may be deduced from renewed awareness of importance of esthetical paradigm unique to outdoor lighting fixture design to heighten the quality of resort landscape.

흡기포트 밸브주위의 유동특성에 관한 실험적연구

박찬준 서울産業大學校 1991 논문집 Vol.33 No.1

The objective of this research is to investigate the flow characteristics around the intake valve in S.I. engine. The experiments were conducted using hot-wire anemometry and impulse swirl meter in a steady flow rig. The three components of velocities at the curtain area of the intake valve and the swirl ratios are measured under a variety of intake port configurations, valve lifts and the positions of intake valve. It was found that the effect of port configuration on the velocity distribution around the intake valve is significant. The tangential velocity profiles in the helical port are independent to the variation of the valve lifts and the measuring positions. In direct port, the flow direction near the valve is same with the valve seat angle, when the valve lifts are 6mm and 3mm. The velocity profiles at the middle plane of the valve lift are not uniform in the direct port which has 15。 port angle, because of the flow momentum occurred by the curvature of port. The swirl ratios are increased when the eccentricity is increased, and those have the maximum values at 0。 orientation angle of port.

가솔린 엔진에서 밸브 개폐시기 변화에 따른 엔진성능의 수치해석 연구

박찬준 서울산업대학교 산업대학원 1996 大學院論文集 Vol.4 No.-

The object of this research is to investigate the effects of valve timing on the performance of engine considered and develop the simulation model for performance and gas exchange processes in an internal combustion engine. The simulation model used the method of characteristic for gas dynamics in gas exchange process and the Wiebe function for power process. The simulation model was then used to find the effects of the valve timing of intake and exhaust valve on the performance of a gasoline engine. The engine speed was varied from 2000rpm to 5500rpm in W.O.T. It was shown that the performance of engine was increased in all engine speed range considered when the valve timing was 18/50/50/18 in case the valve open period of engine was same with standard valve timing. On the other hand, when the valve timing was 8/52/52/8 such as the overlap period of engine was decreased compared with the standard valve timing, the performance of engine was increased in low engine speed range and was decreased in high engine speed. It was also founded that the simulation model could be used to design the components of engine such as the length of intake and exhaust manifolds, the valve timing and the valve lift.

수퍼차저에 의한 가솔린 機關의 性能에 관한 硏究

김동기,신이건,전봉준,박찬준 서울産業大學校 1995 논문집 Vol.41 No.1

The supercharging characteristics and the combustion performance of the spark iginition engine are investigated through the experiments. The apparatuses used in the experiment are the carburetor type 1468cc Gasoline Engine and the screw type supercharger. A supercharger pulley and a water pump pulley through V-belt are connected to the engine. The diameter of supercharger pulley is 63mm. The diameter of water pump pulley used are 63mm and 135mm,repectively.A optical senser is used to measured the speed of a engine. The pressure in first cylinder is measured. The rate of pressure rise and the rate of heat release are calculated. The engine speed considered is increased by 500rpm from 1500rpm to 3500rpm. It is found that the supercharging characteristics and the combustion performance in case of the engine with supercharger are increased at low speed range. Compared the supercharged engine with the natually aspirated engine, the most effects of supercharging on the torque and the rate of maximium pressure rise are observed at 2000rpm and 1500rpm, respectively.

가솔린 엔진에서 마찰 손실에 관한 연구

김동기,이동세,박찬준 서울산업대학교 산업대학원 1996 大學院論文集 Vol.4 No.-

This research is to investigate the effects of engine total friction on the power of engine in order to present the optimizing directions of engine design and development. The test conditions were that the speed of engine was varied from 1500 to 5500 rpm and engine load was also changed from 25% to 100% engine load. The engine considered is SOHC, 12 valve, 4 cylinder, 1495 ㏄, turbo-charged gasoline engine. The methods which were used to measure the engine friction loss were the motoring method and the high-speed data acquisition system method. In the motoring method, the engine friction loss was measured by using a DC engine dynamometer. The state of engine was in ignition off and coolant and oil temperature of engine was 90℃, respectively. The pumping loss in the motoring method is also calculated using the pressure of cylinder measured in the first cylinder. In the high speed data acquisition system method, the IMEP and PMEP were calculated by integrating the P-V diagram which was obtained by using the pressure measured in the combustion chamber. The IMEP was also found by subtracting BMEP from IMEP. The result showed that the FMEP was 4.67 bar when the engine speed was 5500 rpm and engine load was full. It became 34.9% of IMEP but the FMEP which was measured in motoring method was only 2.84 bar. The FMEP measured by the motoring method was much smaller than that measured in the state of firing. Therefore it had only confidence in low speed and low load conditions. The pumping loss was decreased with increasing the % of engine load when the engine speed was below 3000 rpm. The exhaust pressure was increased with % of engine load, because the turbo-charged engine has 2 intake valve and 1 exhaust valve. The pumping loss was therefore increased with % of engine load when the engine speed was above 4500 rpm.

연료 조성에 따른 대체 연료의 공연비 산정법의 비교

박찬준,엄인용,이정만 서울産業大學校 2005 논문집 Vol.54 No.1

This paper is to compare the various Air-Fuel ratio determination methods for alternative fuels. In the previous work, expansion of Eltinge chart, unburned hydrocarbon compensation, comparison of the results from various methods were discussed. It has been also concluded that Eltinge method might be regarded as the most general equation, of AFR determination among the existing ones. In the recent years, however, increasing demand for the environmental preservation, including global warming-up protection, and energy conservation lead to introduce the alternative fuel to the internal combustion engine. Therefore, the exact calculations of AFR for these fuels are needed. Especially, for the fuel that contains oxygen, all AFR calculation equations except Eltinge have to be re-formulated. In this paper, the AFR for alternative fuel were calculated by re-formulated carbon balance, accuracy of which was already confirmed, and linear equations, which are newly proposed by statistical method for each fuel. The results show that AFRs based on carbon balance have a little more error compared with gasoline, however, the accuracy is enough for this formula to apply to various fuel. The proposed linear equation also have excellent accuracy up to X = 1.2.

이탈리아 산업디자인의 텔레시스적 의미와 상관성 연구 : 초 일류 상품개발 기업을 중심으로

박찬준 계원조형예술전문대학 예술공학연구소 1996 계원논총 Vol.1 No.1

제품디자인은 지적 노력의 가치물로서 환경적응적 도구 이상의 내외적 텔레시스한 의미들을 발전시켜 나가고 있다. 즉, 문화적 역사성을 감성적 상징성으로 일류상품화에 성공한 시장지향적(Market Oriented Research) 이탈리아 제품디자인을 토대로 그 가치성을 인식하고자 한다. 본 연구는 문화 산업으로서 이탈리아 제품디자인의 텔레시스적 의미와 역할을 기초로 진행하였다. 또한 예술로서 이탈리아 디자인의 철학적 배경과 물적 이미지네이션을 다원적 코드로 발전시켜 성공한 자동차, 조명, 주방용품 외에 유리, 가구디자인 관련 기업들을 모델로 연구방향성을 좁혀 나갔다. 이탈리아 제품디자인의 텔레시스적 가치는 소유중심에서 사용중심, 나아가 종적, 횡적 양면적 가치를 수용하여 만족중심으로 부가가치의 척도를 새롭게 만들어 가는데 있다. 따라서 실용적 기능 가치와 신기술, 고성능에 가리워져 규정할 수 없는 인간 심성의 실험적 패러다임(Paradigm)을 정신세계의 미디어적 제품으로 전환시킨 이탈리아 디자인의 의미와 상관성의 이해를 돕고자 한다.

연료 조성에 따른 공연비 산정 (I) -기준 배기 조성으로서 Eltinge 차트-

박찬준,엄인용 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.11

불꽃 점화 기관에서 점화 장치가 성능에 미치는 영향

박찬준 서울産業大學校 1994 논문집 Vol.40 No.1

This study is to investigate the effect of ignition system on performance in S.I. engine. The ignition systems considered were TCI(Transistorized ignition), CDI(Capacitive Discharge Ignition), and WJR ignition system which was combined CDI system and Full Transistor system. The spark plugs used were Bosch(WR8HP) and Champion(RC7YC). The gap sizes of spark plus were varied from 1.0mm to 1.8mm and coil system used were Poongsung, Daejun, Bosch, Lucas, Nipondenso. The mixture response tests were conducted in part load condition such as 2400 rpm and 2.4 bar BMEP. The NOx and HC emissions were measured to investigate the efficiency of combustion and misfire limit. The ignition timings were also measured. It was found that the misfire limit was increased when the gap size of spark plug was increased until 1.5mm. The WJR system had the higher misfire limit than that of CDI system because the spark energy of CDI system is strong but too short.