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원전용 게이트 밸브의 성능특성 분석을 위한 유동해석 모델링 연구
김재형(Jaehyung Kim),임태묵(Taemook Lim),이정희(Jung Hee Lee) 한국전산유체공학회 2020 한국전산유체공학회지 Vol.25 No.4
The 3D flow analysis model on gate valve in nuclear power plant is made and validated by known experimental equation, which is the requirement of ASME QME-1 standard. The major loss on valve is calculated and compared to Swamee-Jain equation, where the error of pipe friction coefficient is within 7% error bound. The minor loss on valve is calculated but cannot be compared because of no experimental equation. So the orifice is inserted on pipe instead of valve and the differential pressure and flow rate is used to calculate the discharge coefficient (Cd value) with various size of flow passage. With the validated mesh and model, the flow analysis of gate valve was performed with changing stoke and reynolds number. The minor loss in valve is dominant when the valve is operated and the force on disk is larger with increasing reynolds number. Valve factor, which accounts the loss effect by differential pressure force, is calculated with the flow analysis result. The valve factor can be used in calculation of valve force in design and functional qualification.
원전 유압구동 균형 글로브 밸브의 정적진단시험 분석을 활용한 동적특성 모델링 및 성능평가 연구
김재형(Jaehyung Kim),박태국(Taekook Park),이상혁(Sang Hyuk Lee),류호근(Ho-Geun Ryu),임태묵(Taemook Lim),이정희(Jung Hee Lee) 한국전산유체공학회 2020 한국전산유체공학회지 Vol.25 No.3
The 1D dynamic analysis model is made and validated by static diagnosis experiment result, which is the requirement of ASME QME-1 standard. The operation of valve assembly is qualified near the closing point and that qualification result also can be used on the evaluation of operation throughout whole lift with the test based 1D dynamic analysis model. The functional qualification in partially maintained differential pressure can be used to the qualification in wholly maintained differential pressure, in which the maximum differential pressure is maintained throughout whole lifting. The flow coefficient by CFD is used in the calculation of pressure on the valve assembly. And the upper pressure in pipe is used in the calculation of the various forces on the valve body. The packing force by the effect of the fluid pressure is calculated, where the strength of packing rings and two friction coefficients between stem and bonnet and between stem and packing are used. The static diagnosis in no flow condition can be extended to the dynamic diagnosis in flow condition using the test based 1D dynamic analysis model.