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양상민(S.M. Yang),홍성대(S.D. Hong),신성기(S.K. Sin),박종근(C.K. Park),송동섭(D.S. Song) 한국유체기계학회 2004 유체기계 연구개발 발표회 논문집 Vol.- No.-
Air-operated valve is one of principal valves that are using to control fluid flow in nuclear power plants. A period diagnosis for safety of power plants is necessary. But there are many difficulties such as economic loss caused by income of high cost devices and a matter hard to deal with users. In this study, we developed the diagnostic system that users of power plants are easy to handle. The diagnostic system is composed of database module, diagnosis test module and evaluation module.
유동가시화를 통한 버터플라이 밸브의 유동특성에 관한 연구
양상민(S.M. Yang),홍성대(S.D. Hong),김현정(H.J. Kim),송동섭(D.S. Song),박종근(J.K. Park),박종일(J.I. Park),신성기(S.K. Shin) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
Flow visualization of butterfly valve is tested for four types(15°, 30°, 45° and 90°) of valve opening angle. The inner flow characteristics of valve are studied. The flow variation was measured using a high speed camera which takes 500 frames per second with 1024 × 1024 pixels. These captured images were used for calculation to analyze two dimensional flow velocity of the valve. The smaller opening angle, the more increasing the differential pressure of a butterfly valve. Therefore, we know that the complex flow is occurred by increasing the differential pressure. And it is found that the flowing backward is more increased according to the increase of the opening angle of a butterfly valve. However, its flow pattern is similar to a simple pipe flow when the opening angle is 90°.