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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.
강형석(H.S. Kang),김연식(Y.S. Kim),전형길(H.G. Chun),송철화(C.H. Song) 한국전산유체공학회 2006 한국전산유체공학회지 Vol.11 No.2
A CFD benchmark calculation for a steam blowdown test was performed for 30 seconds to develop the methodology of numerical analysis for the thermal mixing between steam and subcooled water. In the CFD analysis, the grid model simulating the sparger and the IRWST pool were developed by the axisymmetric condition and then the steam condensation phenomena by a direct contact was modelled by the so-called condensation region model. Thermal mixing phenomenon in the subcooled water tank was treated as an incompressible flow, a free surface flow between the air and the water, a turbulent flow, and a buoyancy flow. The comparison of the CFD results with the test data showed a good agreement as a whole, but a small temperature difference was locally found at some locations. The commercial CFD code of CFX4.4 together with the condensation region model can simulate the thermal mixing behavior reasonably well when a sufficient number of mesh distribution and a proper numerical method are adopted.
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.
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.
배병언(B.U. Bae),윤한영(H.Y. Yoon),어동진(D.J. Euh),송철화(C.H. Song),박군철(G.C. Park) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
For the analysis of a two-phase flow, the interaction between two phases such as the interfacial momentum or heat transfer is proportional to the interfacial area. So the interfacial area concentration (IAC) is one of the most important parameters governing the behavior of each phase. This study focuses on the development of a computational fluid dynamics (CFD) code for investigating a boiling flow with a one-group IAC transport equation. It was based on the two-fluid model and governing equations were calculated by SMAC algorithm. For checking the robustness of the developed code, the experiment of a subcooled boiling in a vertical annulus channel was analyzed to validate the capability of the IAC transport equation. As the results, the developed code was confirmed to have the capability in predicting multi-dimensional phenomena of vapor generation and propagation in a subcooled boiling.
미포화 비등 이상유동 내 국소 기포 인자에 대한 실험적 연구
배병언(B.U. Bae),윤병조(B.J. Yun),박원만(W.M. Park),송철화(C.H. Song),박군철(G.C. Park) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Subcooled boiling test was carried out in the SUBO (Subcooled boiling) test facility to extend a database for a code benchmark. The test section is a vertical annulus with a heater rod at the channel center. For the measurement of local bubble parameters, double optical fiber sensors were applied at the six elevations. Total six test matrixes are chosen for the parametric study of the heat flux, mass flux and inlet subcooling. Void fraction, interfacial area concentration and bubble velocity were measured at 12 radial locations at each elevation. The local bubble parameters show well the characteristics and propagation of a void fraction and an interfacial area concentration along the test section in the subcooled boiling flow. The present data will be suitable for the benchmark, verification and model development for the CFD style codes or existing safety analysis codes.