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조필재(Pil-Jae Cho),김희동(Heuy-Dong Kim) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
The present study addresses an analytical investigation to understand the characteristics of gas flow in the<br/> High-Velocity Oxy-Fuel(HVOF) thermal spray gun. One-dimensional analysis is extended to involve the<br/> effects of the wall friction and powder particle diameter. From the present analysis it is well known that the<br/> flow characteristics inside and outside the thermal spray gun is varied depending on the combustion chamber<br/> pressure. The thermal spray gun flow is characterized by six different patterns. The powder particle size and<br/> wall friction significantly influence the powder particle velocity. The particle velocity decreases with an<br/> increase in the powder particle size. This implies that the combustion chamber pressure should be increased to<br/> achieve a higher velocity of the powder particle.
조필재(Pil-Jae Cho),김윤석(Yoon Seok Kim),이승갑(Seung-Kap Lee),윤영(Young Youn),고한서(Han Seo Ko) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
A quality of a refrigeration cycle and a reliability of a compressor can be reduced if a refrigerant including excessive lubricating oil is exhausted from the compressor. Thus, the analysis of the oil behavior inside the compressor is required to prevent the problem. A tested rotary compressor with visualization windows has been manufactured in this study to investigate the oil behavior using developed visualization techniques. The oil behaviors at various operating conditions have been quantified to obtain the relationship with the outlet pressure inside the compressor. Also, the effect of the operating conditions on the quantity of the exhausted oil from the rotary compressor has been investigated using the visualization technique.