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- 주제어 : Globe Valve(글로브 밸브) (검색결과 29 건)
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3차원 유동장 해석을 통한 LNG 선박용 극저온 글로브 밸브 유동특성 및 케비테이션 연구
이완기(Wan Ki Lee),김문기(Moon Ki Kim),최재붕(Jae Boong Choi) 대한기계학회 2019 대한기계학회 춘추학술대회 Vol.2019 No.11
The main functions of globe valve are to shut off and control the fluid flow. Globe valve has high airtightness, but there is a disadvantage like large pressure loss. So globe valve is mainly used as a high pressure valve. In this paper, among the globe valves with various purpose, the globe valve used in LNG marine engine system was selected for the research. There are total of 6 different models with different valve sizes. Computational fluid dynamics(CFD) analysis was conducted by varying the valve opening rate for each valve model. From the analysis results, the pressure drop and cavitation number in valve were calculated. Also, vapor volume fraction contour was obtained. The cavitation index is a indicator that predicts the occurrence of cavitation, and the closer to 1, the higher probability of cavitation. A high correlation was confirmed by comparing cavitation index and occurrence of cavitation.
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양상민(S.M. Yang),신성기(S.K. Shin),이호영(H.Y. Lee),조택동(T.D. Cho),고성호(S.H. Ko) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
Globe valves are used to control the flow or the pressure of the pipe system in a nuclear power plant. The periodic diagnosis of them has been carried out to guarantee the safety of a nuclear power plant. Therefore it is necessary to study on the flow dynamics of globe valves in order to analyze its faults and performance. We acquired the 3D design information of the globe valve. A globe valve is made of acrylamide so that we can see the inside of the globe valve. The flow visualization test is carried out to analyze the inner flow of the valve. The test system is composed of the acrylic valve, a stripe laser and a high speed camera. The velocity distribution of the flow is analyzed by the flow analysis program with images captured by the high speed camera.
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글로브 밸브의 누설방지를 위한 시트 설계 및 유한요소해석
이성호(Sung Ho Lee),강경아(Gyeong Ah Kang),곽재섭(Jae-Seob Kwak),안주은(Ju Eun An),진동현(Dong Hyun Jin),김병탁(Byung Tak Kim) 대한기계학회 2016 大韓機械學會論文集A Vol.40 No.1
밸브는 배관의 유량을 차단 및 제어하기 위한 장치로써 게이트 밸브, 글로브 밸브, 체크 밸브 등 많은 종류가 사용되고 있다. 그 중 글로브 밸브는 고압력 조건에서의 유량조절이 용이하여 LNG 선박, 증기 배관 등에 사용된다. 본 논문에서는 글로브 밸브의 누설 문제를 구조적으로 해결하기 위해 시트의 형상을 변형하는 방법을 제시하였다. 또한 유한 요소 해석을 통해 각 모델의 응력분포와 변형량을 비교하고 이를 통하여 제안한 모델에 대한 검증을 진행하였다. 시뮬레이션 결과 제안된 모델에서 원주 방향의 변형이 줄어들고, 누설을 감소시킬 수 있는 Self-supporting 효과를 확인할 수 있었다. The valves used to control or shut off the flow through a pipeline can be divided into many different types, including gate valves, globe valves, and check valves. Globe valves, in particular, have excellent properties, and because they can easily control the flow under high-pressure conditions, they are generally used in LNG ship and steam pipelines. In this paper, a method for changing the shape of a seat was suggested to solve the valve leakage problem from a structural perspective. In addition, the stress distribution and directional deformation were compared for each model. The suggested models were thus validated, and the optimized seat structure, which includes a self-supporting capability for decreasing the amount of leakage, was determined.
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이호영(H.Y. Lee),조택동(T.D. Cho),양상민(S.M. Yang),고성호(S.H. Ko),신성기(S.K. Shin) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
Air-operated globe valve is one of the principal valves which are used for controlling the fluid flow and the pressure in nuclear power plants. The periodic diagnosis has been carried out to guarantee the safety of nuclear power plants in spite of much expense. It is meaningful to study on the flow dynamics of globe valves in order to analyze its faults and to predict its performance. In this paper, the dynamic equation is modeled using the force balance equations. The numerical analysis is carried out to find out the exact differential pressure(DP) between the up and down side of the globe valve disk. The experiment is also preformed with a 2 inch globe valve. The simulation results show the similar output with the experimental results. The dynamic model is proved through the experiment and the numerical analysis.
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경계조건의 영향에 따른 Miniature globe valve 내의 유동특성에 관한 연구
박재현(J.H. Park),정호승(H.S. Jeong),김정환(J.H. Kim),김정렬(J.R. Kim),이민우(M.W. Lee),이화신(H.S. Lee),김동균(D.K. Kim) 한국마린엔지니어링학회 2006 한국마린엔지니어링학회 학술대회 논문집 Vol.2006 No.-
글로브 밸브(Globe valve)는 유체수송을 위한 각종 배관망에 널리 사용되고 있는 유체 기계의 일종으로 유로부에 대해서 디스크가 수직으로 개폐가 되는 특징을 가지는 특성으로 인해서 압력강하가 많이 발생하는 특징을 가진다. 글로브 밸브에 대한 수치해석적인 연구가 활발하게 이루어지고 있으며 특히 LNG나 수소와 같은 극저온기체의 사용량이 늘어남에 따라 이에 대한 연구도 활발하게 이루어지고 있다. 본 연구에서는 글로브 밸브에 대한 수치해석적인 연구에서 있어 컴퓨터 계산 자원의 한계로 인한 symmetric 경계조건의 사용 여부가 유동해석에 미치는 영향을 분석하여 사용여부의 타당성을 분석하여 향후 밸브 내부 유동에 대한 연구에 기초자료로 활용하고자 한다.
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고차압 글로브 밸브 트림의 anti-cavitation에 관한 수치적 연구
김대권(Dae Kwon Kim),손채훈(Chae Hoon Sohn) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
A globe valve is one of devices which control mass flow rate. In nuclear powerplants, it is usually used for high pressure drop over 100 bar. To attain the high pressure drop, trim in a valve should be designed elaborately to avoid the occurrence of local cavitation in a valve. Trim for high-pressure drop is classified into two types of pressure control and velocity control. This work is focused on design of trim with velocity-control type. Suitable geometry or shape of trim is pursued numerically, which should satisfy two conditions of high-pressure drop and suppression of local cavitation phenomenon. For operating conditions of actual powerplants, flow characteristics and cavitation area are examined numerically. Several trim geometries are proposed as candidates for trim with velocity-control type.
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원전용 평형 글로브 밸브의 유동특성 및 추력특성에 대한 수치해석
김재형,조원삼,김대환,이태현,류경하,김영중,이상혁 한국전산유체공학회 2017 한국전산유체공학회지 Vol.22 No.4
The valve assembly to use in nuclear power plant shall be qualified by ASME QME-1. The maximum differential pressure is required to be maintained throughout whole lifting to practical extent. But the limitation of the test facility leads to the reduction of the upper pressure below the maximum differential pressure. So the engineering evaluation on the pressure reduction is needed. In the present study, the flow analysis of valve assembly is performed using CFD. The flow coefficient is calculated using the differential pressure and flow rate. And using the upper pressure of the valve assembly, the differential pressure force, piston force, packing force, sealing force, and valve body/cage friction force are calculated. Finally the required force is obtained and compared to the real situation. The evaluation of each force can make explanation the difference between the real test and ideal environment. Finally, the maximum required force is occurred at the closing point and the real result of flow interruption and capacity with the reduced differential pressure has engineering meaning within small error, which can not change the previous real test result. It is confirmed that the CFD is useful tools to get the engineering view point.
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