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- 저자 : 진영욱(Youngwook Chin) (검색결과 3 건)
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최성은(Sungeun Choi),정재우(Jaewoo Chung),강정호(Jungho Kang),김남호(Namho Kim),진영욱(Youngwook Chin) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Recently, the DME(Dimethyl Ether) that is attracting attention as a diesel alternative fuel should be required to change and optimally match a fuel system for application to engine. However, it was not proposed of the setting for a injection duration and a injection pressure because of the difference of conventional diesel engine with the physical property. Therefore this study was to propose the optimal application plan of the DME fuel system when applying the diesel engine based on the property of fuel system and compression ignition combustion of DME. To conduct it, plans to functionalize the performance of fuel pump, injector and the setting of injection timing and to extract required performance of fuel system within the limited injection condition through their connection and calculation, were suggested. This calculation process helped to establish the relationship between injector performance and required injection pressure, and it is expected that it would be possible to develop performance of each component using this relationship.
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진영욱 한국기술교육대학교 2004 論文集 Vol.10 No.2
Lagrangian version of the lst and the 2nd law of thermodynamics for the open system is proposed as d(h+V²/2+gz)=δq-δw and ds=δq/T+δs _(gen) respectively, which can be perceived as the system equations of the small control mass flowing along the streamtube. Once these equations are accepted, the entropy generation term in the control volume analysis, which often frustrates students in the undergraduate thermodynamic class, is easily understood as the irreversible increase of entropy of the small control mass during the movement from the inlet to exit of the control volume. Furthermore the Lagrangian equations have advantages over the conventional thermodynamic laws for the control volume in that they can describe the work-extraction procedure of turbomachinary. The state change of the control mass as the result of the mutual work-communication with the impeller enables us to identify the nature of the work loss in the work production process, which provides a logical explanation of the definition of efficiencies. Finally coupling the Lagrangian equations with the fluid -mechanical equations, entropy generation rates ware calculated for the straight pipe and the rapid-expansion pipe flow, and the measures to improve the efficiency of turbomachinary were shown to be found.
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진영욱 한국기술교육대학교 2003 論文集 Vol.10 No.1
Work done by a material particle in the absence of thermal interaction with its surrounding medium is given by δω=pd((1)/(ρ))-Τδs_(gen) for a closed system, δω_(s)=-(1)/(ρ)dp-d((υ²)/(2)) -Τδs_(gen) for an open system respectively. The term Τδs_(gen) is called "lost work" and represents a lost opportunity to extract work during the change in state of the material particle. This study focuses on the lost work in an open system where viscous force within the bulk of fluid is the unique factor that renders the process irreversible. In fact the lost work in an open system is viscous dissipation. Noting that viscous dissipation is closely related to the flow pattern, the optimization of the streamline geometry corresponds to the minimization of the lost work or entropy generation, which is the basic idea of this paper. Three flow patterns were chosen and the measures to reduce the lost work were considered.
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