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정압밸브 폐쇄에 따른 후방 과도압력 및 서지 전파특성 연구
신창훈(C. H. Shin),임지현(J. H. Im),하종만(J. M. Ha),이철구(C. G. Lee),허재영(J. Y. Her) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
The first purpose of this study is examining and understanding the propagation characteristics of transient pressure when the PCV is out of order and then closed immediately. And the second one is clarify the flow-characteristics and propagation-characteristics of the transient pressure and surge wave effected by each factor and parameter consisting the PCV system. For these, we have built the complex numerical analysis model which is consisted both 3D CFD method and 1D numerical method and then we have analysed every case classified by each factor, such as closing time, diameter, header size and PRV installing those can affect transient pressures and surge waves.
정압기 임계유동특성 및 배관망해석 요소로서의 고려에 관한 수치해석적 연구 (II) : 단면적 및 개도 변화
신창훈(C. H. Shin),하종만(J. M. Ha),이철구(C. G. Lee),허재영(J. Y. Her),임지현(J. H. Im),주원구(W. G. Joo) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
The major parameters governing the fluid dynamical and thermo-dynamical behavior in the large pipeline network system are friction loss and the pipeline length. But in local pipeline networks and relatively short distance pipeline system, secondary loss and the considerations of the moving states of the fluid machine are also important. One of the major element in local pressure control system is pressure regulator. It causes the variations of the physical properties in that pipeline system. When it is under working, the accurate analysis of the flow properties is so difficult. In this study, some numerical approaches to investigate the critical-flow-characteristics of the pressure regulator have been done according to the variations of the opening ratio or cross-sectional area and the detail examinations and considerations of the pressure regulator as a pipeline network elements have been carried. Finally the flow-flied distributions and critical-flow-characteristics have been presented in detail and the critical flow phenomena and the relation to the opening ratio or cross-sectional-area ratio have been studied.
하영철(Y. C. Ha),허재영(J. Y. Her),이철구(C. G. Lee),이강진(K. J. Lee),안승희(S. H. An),정종태(J. T. Chung) 한국유체기계학회 2000 유체기계 연구개발 발표회 논문집 Vol.- No.-
The flow computer named Kogas I has been developed for measuring high flow natural gas. The developed model is classified as individual type in order that one flow computer covers one metering line. Nearly all of the functions are adopted similar to the foreign, commercial flow computer, and the merit of this flow computer is being able to apply for both orifice and turbine meters. The performance has been verified through the field test for 2 years.