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응축 풀 내의 비정상 층류 제트의 유동 특성에 관한 연구
최용문,김종보,Choi, Yong Moon,Kim, Chong Bo 대한설비공학회 1988 설비저널 Vol.17 No.4
The pressure suppression pool of BWR(Boiling Water Reactor) is subjected to hydrodynamic impact in the event of a LOCA(Loss of Coolant Accident). The pressure increase in the reactor dry cell would force the existing water of a vent pipe into the suppression pool. When the water is ejected through the pipe opening into the suppression pool, an abrupt downward force is transmitted to the suppression pool floor. Consequently, many structures installed within the pool must be able to withstand these forces. In order to determine the optimum safe locations of the pool structures, numerical analysis have been carried out to investigate the hydrodynamic behavior of the water jet. In the present analysis, a two-dimensional numerical model is utilized to solve transient flow equations.
차지선,박경암,최용문,최해만,윤복현,Cha, Tsi-Sun,Park, Kyung-Am,Choi, Yong-Moon,Choi, Hae-Man,Yoon, Bok-Hyun 한국유체기계학회 2000 한국유체기계학회 논문집 Vol.3 No.2
Small sonic nozzles (throat diameter $0.28{\~}4.48mm$) were tested in the gas flow standard system. This standard system is composed of two bell provers and 5 column piston provers, compressor, filters, and dehumidifier. The discharge coefficients of small some nozzles are obtained and correlated as a function of throat Reynolds numbers with $0.316\%$ uncertainty at a confidence level $95\%$. The tested high Reynolds number was the lower limit of ISO 9300 specifications. The data are useful as data base for revision of ISO 9300.
전세종(Sejong Chun),최용문(Yong Moon Choi),최해만(Hae Man Choi),최지철(Ji Chul Choi),홍경기(Kyung Ki Hong),한상우(Sang Woo Han),김웅선(Woong Sun Kim) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
The averaging pitot tube or annubar is widely employed to measure the flow rate of the pollutants discharged from the chimney in many industrial situations. Accurate monitoring of the amount of the discharged pollutants necessitates the annubar calibration, which is usually performed in wind tunnels and the calibration conditions are dependent on the size of the wind tunnel test section. However, there are many situations where annubars are larger than the typical size of wind tunnel test sections. In the present study, a new technique using partial blockage was proposed, enabling calibrations of large annubars in various configurations. The results demonstrated favorable agreements with the original annubar coefficients.
전세종(Sejong Chun),최용문(Yong Moon Choi),최해만(Hae Man Choi),이생희(Saeng Hee Lee) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
Cup anemometers are popular devices for measuring wind speed in an automative weather measuring system, an environmental monitoring system and a wind turbine. The cup anemometers usually suffer from long-term stability by the wear of the bearing system to support the rotational parts. They are susceptible to external pollutants, vibrations or gusts. Therefore it is necessary to have a regular calibration service to maintain the characteristics of cup anemometers measuring wind speed. In the present study, a new type of in-situ calibration system is suggested to save costs and time by calibrating the cup anemometers near the place where they are installed. An in-situ calibrator was fabricated in portable size. After the characteristics of the in-situ calibrator was verified, cup anemometers were calibrated by this device. Some of the calibration results were compared with the data given by the wind tunnel testing.