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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.
분사각 및 홀 직경 변화에 따른 박용디젤엔진 분무특성에 관한 수치해석 연구
한동식(Dong-Sik Han),이병화(Byoung-hwa Lee),배명직(Myung-Jik Bae),장영준(Young-June Chang),전충환(Chung-Hwan Jeon),송주헌(Ju-hun Song) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
It is very important to understand spray characteristics and fuel injection conditions in direct-injection diesel engine because emission gas compositions from diesel engines are closely related to spray formation processes. In this study, the characteristics of diesel spray has been studied using a computational fluid dynamics code, named STAR-CD. Reitz & Diwarkar model was used for the breakup models while standard k-ε turbulence model was consider for the compressibility effect due to moving process of piston. In this paper, the numerical simulation was performed to study the spray characteristics such as vapor mass fraction, evaporation rate and SMD and their impact on engine performance.