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접선형 산화제 주입기의 운동량비에 따른 End-Burning 하이브리드 연소기의 연소유동장 해석
민문기(Moon-Ki Min),김수종(Soo-Jong Kim),김진곤(Jin-Kon Kim),문희장(Hee-Jang Moon) 한국추진공학회 2007 한국추진공학회지 Vol.11 No.2
In this study, combustion fields of the end-burning hybrid combustor with tangential oxidizer injectors are examined. Momentum ratio of oxidizer is used as a main parameter to analyse the combustion efficiency with temperature, pressure, swirl velocity and mixture fraction field. It was found that as momentum ratio decreases the overall combustion efficiency is enhanced with the pressure field being insensitive to momentum ratio keeping quasi-uniform distribution. Irrespective to the momentum ratio, annular hot region commonly occurred in the upper combustion chamber where this phenomenon was left for a future improvement to be followed.
End-Burning 연소기의 충돌형 산화제 주입기 형상 변화에 따른 연소유동장 해석
민문기(Moon-Ki Min),김수종(Soo-Jong Kim),윤창진(Chang-Jin Yoon),김진곤(Jin-Kon Kim),문희장(Hee-Jang Moon) 한국추진공학회 2007 한국추진공학회지 Vol.11 No.5
The end-burning combustion field using impinging oxidizer injectors are analyzed with tangential type injectors in order to examine their mixing and combustion characteristics. The impinging type showed further improved mixing effect as well as the combustion efficiency compared to the previously studied tangential injector. A novel injector capable of delivering impinging and swirl effect is introduced in this study where it demonstrated that the grain coning effect can be avoided. It was found that the combined impinging and swirling flow would promote the radial mixing rate increasing the residence time and the turbulent intensity. However, the use of the step combustor which may augment the turbulent intensity did not show any notable difference compared to the basic combustor.
변압기 지역 코로나 전자파 간섭에 의한 계측제어설비 영향에 관한 연구
민문기(Moon-Gi Min),이재기(Jae-Ki Lee),박진엽(Jin-Yeub Park),김희제(Hee-Je Kim) 대한전기학회 2014 전기학회논문지 Vol.63 No.2
The Electromagnetic Interference(EMI) generating from corona discharge of transformer area can interference the digital Instrument and Control(I&C) systems located nearby transformers. When the potential gradient of the electric field around the conductor is high enough to form a conductive region but not high enough to cause electrical breakdown to nearby objects, the EMI of corona discharge emits with the conducted and radiated noise and it interferences the signals of the I&C systems. Since digital I&C systems have an efficiency and competitive price, the analog I&C systems have been upgraded and displaced with the digital I&C systems but which have less EMI Immunity. There was no assessment to I&C systems by EMI generating corona discharge nearby transformers. When the safety-related I&C systems are installed in plants, the verification of equipment EMI should be done not in site-specific test but in test facilities. There are the need to do the site-specific EMI evaluation of corona discharge nearby transformers. This paper assesses the margin between plant emission limits and the highest composite plant emission of corona. When the non safety-related I&C systems are placed in transformer area, it suggests the appropriate radiated susceptibility level to EMI of corona discharge.
가동원전에서 공정모델링을 통한 PID 튜닝 시뮬레이션 방법
민문기(Moon-Gi Min),정창규(Chang-Gyu Jung),이광현(Kwang-Hyun Lee),이재기(Jae-Ki Lee),김희제(Hee-Je Kim) 대한전기학회 2014 전기학회논문지 P Vol.63 No.4
PID(Proportional, Integral, Derivative) controller is the most popular process controllers in nuclear power plants. The optimized parameter setting of the process controller contributes to the stable operation and the efficiency of the operating nuclear power plants. PID parameter setting is tuned when new process control systems are installed or current process control systems are changed. When the nuclear plant is shut down, a lot of PID tuning methods such as the Trial and Error method, Ultimate Oscillation method operation, Ziegler-Nichols method, frequency method are used to tune the PID values. But inadequate PID parameter setting can be the cause of the unstable process of the operating nuclear power plant. Therefore the results of PID parameter setting should be simulated, optimized and finally verified. This paper introduces the simulation method of PID tuning to optimize the PID parameter setting and confirms them of the actual PID controller in the operating nuclear power plants. The simulation method provides the accurate process modeling and optimized PID parameter setting of the multi-loop control process in particular.