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洪起培 충주대학교 1984 한국교통대학교 논문집 Vol.18 No.1
Through a theoretical study on the concentration in the exhaust gas of automotive 4-cycle engine. In exhaust gas, air pollution is coused by CO gas, NO gas, CO₂gas. The results about increase and decrease about CO as, NO gas, CO₂gas are as follows, when excess air ratio 入 was 0.6, 0.8, 1.0, 1.2, 1.4. In exhaust gas, according to rise of excess air ratio 入, percentage of CO was decrease, percentage of CO₂and NO ard increase when excess air ratio was from 0.6 to 1.0, it was decrease when excessair ratio was fom 1.0. Percentage of CO was increase when percentage of oil about fuel was increase, CO₂and NO were decrease when Q was increase.
지하구내 OF 케이블의 화염전파속도와 연기거동속도 특성
홍기배 충주대학교 2006 한국교통대학교 논문집 Vol.41 No.-
The Eexperimental study was performed to characterize the surface flame propagating velocity along the OF cable in the underground utility fire. Temperatures of oil filled OF cable and dried OF cable with the diameter of 90 mm were measured using thermocouple and data log system. It was found that the surface propagating flame velocity of the three OF cables is 2.1~2.8 times faster than that of one OF cable case. and the smoke movement velocity of the three OF cables is 1.38 times faster than that of one OF cable case. The results show that the surface propagating flame velocity and smoke movement velocity became larger as increase of the number of cable, the volume of alkyl-benzene oil in the cable. The characteristics of surface propagating flame velocity and smoke movement velocity in the OF cable can be helpful to fire suppression system in utility.
混合燃料를 CI機關에 使用하기 위한 메탄올 混合比에 關한 硏究
홍기배 忠州大學校 1991 한국교통대학교 논문집 Vol.25 No.-
To predict the performance and exhaust gas for CI engine using methanol-diesel blended fuel, In this study experimental conditions were as follows; Atmosphere temperature was 15±1℃,cooling water temperature was 80±20℃,Rotation numbers of engine were 1500,2000,2500,3000rpm. There were measured Pmax. dp/dg in combustion cylinder the volume of combustion fuel,Torque of axis exhaust gas density. Therefore,it was useful case for fuel save,engine performance,exhaust gas at the methanol 10% Blended fuel.
고압 호스에서 굽힘의 각도가 압력 변화에 미치는 영향에 대한 수치해석적 연구
홍기배,김민석,유홍선 한국산업융합학회 2022 한국산업융합학회 논문집 Vol.25 No.1
Fire damage time in high-rise buildings and wildland fire increasing every year. The use of high-pressure fire pumps is required to effectively extinguish fires. Reflecting the curvature effect of the fire hose occurring at the actual fire fighting site, this study provides a database of pressure drop, discharge velocity and maximum discharge height through C FD numerical analysis and it can provide using standards for fire extinguishing. Two Reynolds numbers of 200000 and 400000 were numerically analyzed at 0° -180° bending with water of 25℃ as a working fluid in hoses with a diameter of 65mm, a length of 15m, and a radius of curvature of 130mm. Realizable k-ε turbulence model was used and standard wall function was used. The pressure drop increases as the bending angle increases, and the maximum value at 90° and then decreases. The increasing rate is greater than the decrease. The velocity of the secondary flow also decreases after having the maximum value at 90°. The decreasing rate is greater than the increase. The turbulent kinetic energy increases to 120° and decreases with the maximum value. Pressure drop, velocity of the secondary flow, and turbulence kinetic energy are measured larger in the second bending region than in the first bending region.
洪起培 忠州大學校 1989 한국교통대학교 논문집 Vol.23 No.-
Flow through thin-wall axisymmetric tubes has long been of interest to physiologists. Analysis is complicated by the fact that such tubes will collapse when the transmural pressure is near zero. Because of the absence of any body of related knowledge in other sciences or engineering previous workers have directed their efforts towards experimental studies of flow in collapsible tubes. This paper was experimental study on the Fluid Flow through A collapsible Tube. This experimental apparatus is the most popular laboratory apparatus by interposing a segment of latex tube in a rigid hydraulic net work where the levels of a supply of a supply tank and an outlet reservoir regulated the pressure gradient for and a surrounding jacket provided an adjustable external pressure. In this experimental results were as follows: The flaw rate Q was decrease when External pressure was increase. Self-excited oscillations occurred for certain values of R₂in the region of negative slope of the P-Q Curve Cross-sections of the collapsible tube was collapsed when External pressure was high and internal prossure was low.