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김재형(J.H. Kim),신대용(D.Y. Shin),신동우(D.W. Shin),이정희(J.H. Lee),김찬중(C.J Kim) 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.5
In case that there is no large test facility for the operation test of pressure relief valve in nuclear power plant, there is no experimental method to get the operation parameter such as the change of lift and thrust, the dead time, the stroke time, and flow capacity. In this study, the analysis of operation parameter was performed with the mathematical model. The mathematical model was made by combine computational fluid dynamics and multi-body dynamic, which leads to accurate mathematical model. This analysis result can be used in the functional qualification of pressure relief valve in nuclear power plant.
전산해석을 활용한 원전용 오리피스 플레이트 내의 고압유동 특성 연구
김재형(J.H. Kim),이정희(J.H. Lee) 한국전산유체공학회 2017 한국전산유체공학회지 Vol.22 No.2
The flow measuring system with orifice plate used in nuclear power plant must be qualified but the limitation of the test facility leads to use the numerical analysis instead of the calibration experiment of orifice plate with high pressure flow. The discharge coefficient is calculated with the pressure drop and mass flow rate obtained from numerical analysis. And the discharge coefficient is compared to the calculation result of ISO 5167. Consequently, it is found that the numerical analysis is possibly used to justify the relation of differential pressure to the flow rate, which was obtained from calibration experiment. From the justification of orifice plate, the discharge coefficient from numerical analysis can be used in the differential pressure transducer of orifice plate and flow computer with which the flow value is modified in considering the difference of real condition to base pressure and temperature where the relation of flow and differential pressure was calibrated.
전산유체역학을 활용한 원전용 밸브의 유량계수 산출에 대한 연구
김재형(J.H. Kim),이정희(J.H. Lee) 한국전산유체공학회 2016 한국전산유체공학회지 Vol.21 No.4
The valve used in nuclear power plant must be qualified but the limitation of the test facility leads to use the numerical analysis. The flow coefficient is calculated with the consideration of the pressure, velocity and geometry. And the flow coefficient is the important physical property which is prepared using experiment or analysis by valve manufacturer. In this study, the analysis model was made according to ISA 75.02.01 and the mass flow rate and pressure drop ratio was calculated. The model of the expansion factor was applied to the simulation result and the pressure drop ratio at the start of the choked flow in the valve was found. With the simulation result, the consideration was performed that the expansion factor is the important physical property to the system engineer in addition to the flow coefficient.