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열전달 특성에 따른 전기용해로 내부 온도예측에 관한 수치적 연구
한동식(Dong-Sik Han),전충환(Chung-Hwan Jeon),장영준(Young-June Chang),송주헌(Ju-Hun Song) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
The main objective of this study is to analyze the heat transfer characteristics in the electric furnace. Local temperatures are measured at various locations in the furnace using the B-type thermocouples. In this paper, mathematical heat transfer model has been developed predict temperature distribution by considering the thermal radiation and transient conduction effect on heating element, crucible and furnace walls. The numerical simulation was performed using the ANSYS-Workbench software, and its results were compared with experimental data. The computational results show that the temperature distributions agreed well with experimental results. Finally, a difference in temperature behavior of the crucible was investigated as some heat transfer parameters change.
장영준(Young June Chang),김재훈(Jae Hun Kim),한승무(Seung Moo Han),김철(Chul Kim) Korean Society for Precision Engineering 2007 한국정밀공학회지 Vol.24 No.3
A internal lobe pump is suitable for oil hydraulics of machine tools, automotive engines, compressors, constructions and other various applications. In particular, the pump is an essential machine element of an automotive engine to feed lubricant oil. The subject of this paper is the theoretical analysis of internal lobe pump whose the main components are the rotors: usually the outer one is characterized by lobes with circular shape, while the inner rotor profile is determined as conjugate to the other. The topic of this paper is the design of a new rotor, which is based on specific performance as different types depending on the shape of the lobe of the outer rotor. First, the design of internal lobe pumps with circular, elliptical, and their combined lobe profiles is considered. The latter is a new type of lobe profile with special shape whose curvature follows a definite function. Then we introduce the performance indexes used for the comparison. Some of these indexes, such as flow rate and flow rate irregularity, are commonly used for the comparison, while specific slipping is particularly suitable in this case. It is possible to notice that the circular and elliptical type is comparable to the circular one or the elliptical one in terms of flow rate irregularity, but has improved performance in terms of specific slipping. Results obtained from the analysis enable the designer and manufacturer of oil pump to be more efficient in this field.
다이아프램식 수소압축기의 캐비티 내 압력특성 변화에 관한 실험적 연구
신영일(Shin, Young-Il),박현우(Park, Hyun-Woo),이영준(Lee, Young-Jun),송주헌(Song, Ju-Hun),장영준(Chang, Young-June),전충환(Jeon, Chung-Hwan) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.06
Diaphragm compressors are used for a hydrogen compression because it can achieve high gas pressure with high purity. But diaphragm's lifetime may depend on the shape of the cavity and deflection from fluctuation the pressure change, which is necessary to monitored. In this study, the gas and hydraulic oil pressure in the cavity were measured as piston speed varies for diaphragm compressor. The results show pressure change quantities were reduced and maximum pressure points are delayed as the piston moves faster. And the hydraulic pressure were elevated as gas pressure elevated. And the compression period was more faster than expansion period.
이영준(Young-Jun Lee),황민영(Min-Young Hwang),송주헌(Ju-Hun Song),장영준(Young-June Chang),전충환(Chung-Hwan Jeon) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
The objective of this study was to investigate the combustion characteristics of a sintering burner in the various design factors which were distance and angle of each injection hole. To analyze the characteristics, the numerical study was conducted y 3 cases of differential hole distance and 4 types of hole angle which were 40, 45°, 50°, 55° at each case. To validate the numerical study, an experimental study was performed in a unit of the sintering burner at same conditions of the iron ore sintering process. Throughout the results, some difference was existed in the combustion characteristics about the design factors.
메탄/공기 다중 분류 예혼합 화염에서의 유동과 연소 특성
강길영(Kil Young Kang),장영준(Young June Chang),전충환(Chung Hwan Jeon) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
An experimental study was carried out to investigate the combustion characteristics of an array of multiple pre-mixed methane/air flame jets. The combustion characteristics such as operating ranges and NOx emission were examined with the variation of design factors including slot shape, slot size, and spacing. The flow of the between-jets was compared with using computational analysis. The interaction effects and flow characteristics were analyzed with the jet-to-jet spacing (S/D<SUB>e</SUB>) and slot shape.
이석영(Suk Young Lee),김규보(Gyu Bo Kim),박호준(Ho Jun Park),전충환(Chung Hwan Jeon),장영준(Young June Chang) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This study deals with the result of exhaust emission and performance calculated by simulation of the fuel injection characteristics of the inline injection system in a diesel engine. The emission are calculated through non-equilibrium by using the extended Zel'dovich kinetic mechanism for NOx and equilibrium method for OH, CO, H₂, H and soot concentrations. And comparison of the model predictions with the other experimental value show reasonably agreement. Detailed prediction results showing the sensitivity of the model by injection rates are presented and discussed.<br/>