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주인철(I.C. Chu),홍성덕(S.D. Hong),윤영중(Y.J. Yun),송철화(C.-H. Song),천세영(S.Y. Chun) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
In the present study a new measurement technique has been developed, which uses an ultrasonic transmission signal<br/> in order to determine the vertical two phase flow pattern. The ultrasonic measurement system developed in the present<br/> study not only provides the measurement functions required for the determination of vertical two phase flow pattern but<br/> also makes the real time determination possible. The developed ultrasonic measurement system accurately determined<br/> the various vertical two phase flow patterns such as bubbly, slug, churn, annular flow etc. In addition to the<br/> determination of flow patterns, the qualitative information for each flow pattern can be obtained, which includes void<br/> fraction in bubbly flow, length of slug bubble and liquid tail characteristics in slug flow, and stable or transient<br/> condition of the flow patterns, etc.
주인철(I.C. Chu),정흥준(H.J. Chung),박원만(W.M. Park),송철화(C.-H. Song),박종균(J.K. Park) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
The present paper provides experimental results obtained in the full-scale tests for the performance<br/> evaluation of the passive flow controlling device, called Fluidic Device, which is expected to be adopted in a<br/> Korean next generation reactor (APR1400). The tests have been carried out using the full-scale test facility<br/> called VAPER(Valve Performance Evaluation test Rig). Based on the full-scale performance test results for<br/> various fluidic device designs, the best design of the fluidic device is chosen to satisfy the primary<br/> performance requirements of the APR1400 plant design in view of the discharge flow rate characteristics,<br/> discharge flow switching function, duration of discharge flow, and water level depression in the stand pipe.
최남현(N. H. Choi),주인철(I.-C. Chu),정장환(C. H. Chung),조봉현(B. H. Cho),송철화(C.-H. Song) 한국유체기계학회 2004 유체기계 연구개발 발표회 논문집 Vol.- No.-
The present paper provides the design specifications and working principle of flow controlling vortex valve which will be adopted in a Korean next generation reactor (APR1400). The vortex valve is installed inside the pressurized safety injection tank of APR1400, and it passively controls the water discharge flowrate from the tank. In the present study, the performance of the vortex valve have been evaluated throughout the repeated experiments in the full-scale test facility called VAPER(VAlve Performance Evaluation Rig). Based on the experimental results, it is confirmed that the currently developed vortex valve satisfies the major performance requirements of APR1400 plant design in view of the peak discharge flowrate, pressure loss coefficient, and total discharge duration time. To achieve the highest quality of the experimental results, a quality assurance program for vortex valve tests has been strictly applied.