超音波에너지가 附加된 混合燃料를 이용한 機關의 性能에 관한 硏究

권기린,부영진 제주대학교 공과대학 첨단기술연구소 2002 尖端技術硏究所論文集 Vol.13 No.1

This is an experimental study on the possibility of using a blend oil by ultrasonic adding in diesel engines. It is compared to engine torque, the rate of fuel consumption, the thermal efficiency and ultrasonic adding effect for engine speed. The results are obtained as follows : 1. Of all the fuel oil, it is indicated that the maximum torque is at 2000rpm and the torque is rapidly decreased according to increasing engine speed. When engine speed is more than 2400rpm, it is found that blend oil is lower and the blend oil of ultrasonic supply is the same, in compared with the torque of light oil. 2. With the ultrasonic adding in fuel, the thermal efficiency is estimated average of 28.4% and maximum of 30.07% in light oil and average of 30.29% and maximum of 31.09% in blend oil. The result confirms that blended oil is better than light oil for the improved effect of thermal efficiency with ultrasonic adding. From the above results, in order to apply blend oil to engine fuel, it will be desirable to apply the very high added effect of ultrasonic energy, and also, thoroughly investigate the rapid drop of torque and thermal efficiency and the phenomenon that the amount of fuel consumption increases at high engine speeds.

偏心된 入口를 갖는 急擴大管에서의 난류 旋回流動과 熱傳達에 관한 硏究

권기린 濟州大學校 工科大學 産業技術硏究所 1998 尖端技術硏究所論文集 Vol.9 No.1

An experimental study of decaying swirl air flow has been obtained by tangential inlet in an abrupt expansion tube. Experiments were carried out for the turburlent swirling flow and heat transfer characteristics of an eccentric expansion in a circular tube with a constant heat flux. The uniform heat flux condition was imposed to the downstream of an eccentric expansion by using an electrically heated tube and the flow upstream of the expansion was unheated and fully developed. Experimental data are presented for local axial velocities and local heat transfer rates in the tube downstream of an abrupt 3:1 expansion. Air was used as the working fluid. In the upstream tube, the Reynolds number was varied from 60,000 to 100,000 and swirl number range(based on the swirl geometry, i.e. L/d ratio) in which the experiments were conducted was L/d = 0, 5. The results obtained are summarized as flows. 1) Fully development region showed from x/d=16 to downstream in case of non swirl flow but x/d=24 on the swirl flow. 2) A ratio of friction factors(fs/f) of the test tube inlet were increased 600∼1400% than that of value for fully developed flow. 3) The wall temperature and the bulk temperature showed high when Reynolds numbers was small and swirl intensity was incresed. 4) The location of the maximum Nu/NuDB showed at the point of 4 step hights, for Re=60,000. 5) It was found that the swirl flow behaviors depend on the swirl intensity along the test tube.

경사진 입구를 갖는 급확대관내의 난류유동과 열전달특성에 관한 실험적 연구

권기린,한진규 濟州大學校 工科大學 産業技術硏究所 1994 産業技術硏究報告 Vol.5 No.-

Experiments were carried out for the turbulent flow and heat transfer downstream of an 10^(2) -inclined concentric expansion in a circular pipe with a constant wall heat flux. The uniform heat flux condition was imposed to the downstream of an inclined expansion by using an electrically heated pipe and the folw upstream of the expansion was unheated and fully developed. Runs were made with small diameter to large diameter ratio of 0.33 and over the Reynolds numbers range of 60,000, 90.000 and 120,000 (based on upstream diameter). Experiments were tested with air as working fluid. The results ovtained are summarized as follows; 1) Fully development region showed from x/d=22 to downstream in an 10^(2) - inclined concentric expansion turbulent flow through the test tube. 2) Friction factors of the test tube showed a maximum value at x/d=15. 3) For all Reynolds number, the wall temperature showed a curve of parabolic variation at 16<x/d<48, and the bulk temperature showed a linear distribution of increse at 9<x/d<48. 4) The location of the maximum Nu/NuDB showed at the point of 16 step-heights for Re= 60,000, 90,000 and 120,000 of an 10^(2) - inclined concentric expansion.

偏心된 입구를 갖는 급확대관에서의 난류 선회유동과 열전달에 관한 연구

권기린 濟州大學校 産業技術硏究所 1998 산업기술연구소논문집 Vol.9 No.1

An experimental study of decaying swirl air flow has been obtained by tangential inlet in an abrupt expansion tube. Experiments were carried out for the turburlent swirling flow and heat transfer characteristics of an eccentric expansion in a circular tube with a constant heat flux. The uniform heat flux condition was imposed to the downstream of an eccentric expansion by using an electrically heated tube and the flow upstream of the expansion was unheated and fully developed. Experimental data are presented for local axial velocities and local heat transfer rates in the tube downstream of an abrupt 3:l expansion. Air was used as the working fluid. In the upstream tube. the Reynolds number was varied from 60.000 to 100.000 and swirl number range(based on the swirl geometry, i.e. L/d ratio) in which the experiments were conducted was L/d = 0. 5. The results obtained are summarized as flows. 1) Fully development region showed from x/d=16 to downstream in case of non swirl flow but x/d=24 on the swirl flow. 2) A ratio of friction factors(fs/f) of the test tube inlet were increased 600~1400% than that of value for fully developed flow. 3) The wall temperature and the bulk temperature showed high when Reynolds numbers was small and swirl intensity was incresed. 4) The location of the maximum Nu/NuDB showed at the point of 4 step hights. for Re=60,000. 5) It was found that the swirl flow behaviors depend on the swirl intensity along the test tube.

冷却水溫 變化에 따른 가솔린 기관 特性에 關한 實驗的 硏究

권기린,홍성수 제주대학교 산업기술연구소 2000 尖端技術硏究所論文集 Vol.11 No.1

The purpose of this study is to prevent the stick, scuffing, scratch between piston and cylinder in advance, to obtain data for duration test in actual engine operation. The temperature gradient in cylinder bore according to coolant temperature were measured in use of 1.5ℓ class gasoline engine. 20 thermocouples were installed at points of 2mm inside from cylinder wall near top ring of piston in cylinder block, which points have suffered major thermal loads and suggested as proper measurement points for engine design by industrial engineers. Under full load and 70℃, 80℃ and 90℃ coolant temperature conditions, the temperature in cylinder block and engine oil increased gradually in according to the increase of coolant temperature, the siamese side temperature of top dead center is 142℃ in peripheral distribution, that is about 20℃ higher than thrust, anti-thrust, and rear side temperature, the fuel consumption in 70℃ coolant temperature is lower than 80℃ and 90℃ coolant temperature, the engine torque in 80℃, 90℃ coolant temperature condition is about 0.5kg.m higher than 70℃ coolant temperature.

건물 신선 외기 태양열 난방 제어 시스템에 관한 연구

권기린,현명택,강은철 제주대학교 공과대학 첨단기술연구소 2002 尖端技術硏究所論文集 Vol.13 No.2

Unglazed solarwall installed in south wall is to preheat fresh air by solar insolated energy. This system has been proved as cost effective and easy to design and install and even operate. So, advanced countries such as Canada and USA have already developed and applied the solar wall systems. KIER has started to work on design, analysis and control of the solar wall system. The purpose of this paper is to introduce the solar wall fresh air heating control system. The control system logic as well as hardware will be explained. The impacts of solar wall control system on the room temperature have been investigated. The designed control system to keep the room temperature constant between 18℃ to 25℃ could be developed and demonstrated with LabVIEW 6i software and DAQ hardware in KIER.

家庭用보일러에서 超音波에너지를 附加한 輕油 및 混合燃料의 有用性에 關한 硏究

권기린,정광훈 제주대학교 공과대학 첨단기술연구소 2002 尖端技術硏究所論文集 Vol.13 No.2

This study was undertaken to investigate the usability in domestic oil boiler through the viscosity reduction and atomization of ultrasonic energy-added light oil and blend oil as the alternative fuel of light oil. 1. UL was the best at the combustion performances. The temperature of the combustion chamber and the boiler efficiency became increased by 2.0% and by 6.45% compare with light oil. CO and SO_2 was decreased, but NOx was increased by 5.17% compare with light oil 2. When using ULR10 and ULR20, the temperature of combustion chamber was as similar as that of LO, the boiler efficiency was increased by 4.83% and by 1.61% and NOx, CO and SO_2 were decreased. This shows the possibility that rapeseed oil would be substituted for light oil. 3. When using ULW10 and ULW20, the temperature of the combustion chamber and the boiler efficiency were lowered a little, but NOx, CO and SO_2 were decreased sharply.

제주형 작물재배용 비닐하우스의 모델개발 : 풍하중에 대한 수치해석

권기린,김용호,민창식 제주대학교 환경연구소 1998 환경연구논문집 : 제주대 Vol.6 No.-

An elastic analysis under wind load is performed for the double layered plastic greenhouse model developed particularly for minimizing damages under typhoons at Cheju Citrus Research Institute in Chejudo. General EVA frlm is used for the inner covering and for the outer covering the developed special film whch would break the wind pressure down is used. Based on the wind tunnel test. this special film will reduce effectively the wind speed by up to 86 to 98% under very controlled situation. Many more tests need to be performed to adopt the results to greenhouse analysis. Based on the elastic analysis performed in the study, the behavior of the greenhouse is changed dramatically due to the boundary conditions. Not like other researchers before we applied dead load of the concrete support at the ground pipe and fixed support boundary conditions at the 4 corner pipes. The analysis shows that the greenhouse is lifted and pulled the pipe out of the ground due to the sucking wind pressure. The behavior of the greenhouse is very much similar to that one real greenhouse failure. Therefore, not only we need to find the realistic boundary conditions for the supports, but also need to perform many more researches to find how to rest the pipe supports on the ground without losing economy.

초음파 에너지를 부가한 물-경유 에멀젼유의 디젤기관 성능에 관한 연구

권기린,강남훈 제주대학교 공과대학 첨단기술연구소 2001 尖端技術硏究所論文集 Vol.12 No.2

This study was undertaken to investigate the engine output, fuel consumption and its brake thermal efficiency of diesel fuel(DF), ultrasonic energy adding diesel fuel(UDF) and ultrasonic energy adding emulsified fuel(UEF) according to the variation of the speed of engine revolution through engine performance test device under the circumstances of electrical load (4/4) and 80℃. The results obtained are as follows: 1. In the case of UDF, as a result of fuel atomization combustion efficiency became good and accordingly fuel consumption rate decreased by 2∼2.5%, brake horsepower increased by 1.32% maximum. According to decrease in fuel consumption rate and increase in brake horsepower, specific fuel consumption rate was improved by 1.8∼3.5%, and brake thermal efficiency was improved by 2∼2.6%. 2. When using UEF, torque and brake horsepower decreased by 0.4∼1.35%, 0.41∼1.34%, fuel consumption rate increased by 3.15∼4.05%. 3. When using UEF, in spite of the increase in brake horsepower and fuel consumption rate, owing to the small calorific value of emulsified fuel, brake thermal efficiency was improved by 6.1∼7.3%. 4. In the case of UDF, torque was improved, whereas when using UEF, torque was decreased.

냉각수온 변화에 따른 가솔린 기관 특성에 관한 실험적 연구

권기린,홍성수 濟州大學校 産業技術硏究所 2000 산업기술연구소논문집 Vol.11 No.1

The purpose of this study is to prevent the stick, scuffing. scratch between piston and cylinder in advance, to obtain data for duration test in actual engine operation. The temperature gradient in cylinder bore according to coolant temperature were measured in use of 1.5 1 class gasoline engine. 20 thermocouples were installed at points of 2mm inside from cylinder wall near top ring of piston in cylinder block. which points have suffered major thermal loads and suggested as proper measurement points for engine design by industrial engineers. Under full load and 70%. 80% and 90% coolant temperature conditions. the temperature in cylinder block and engine oil increased gradually in according to the increase of coolant temperature, the Siamese side temperature of top dead center is 142% in peripheral distribution. that is about 20% higher than thrust. anti-thrust. and rear side temperature. the fuel consumption in 70% coolant temperature is lower than 80% and 90% coolant temperature, the engine torque in 80%. 90℃ coolant temperature condition is about O.5kg.m higher than 70% coolant temperature.