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유기발광다이오드(OLED) 소재 제조 현장 여과 설비사용 위험성 및 개선 방안 연구
곽종구,강찬규 한국가스학회 2023 한국가스학회지 Vol.27 No.4
In this study, an experimental study was conducted on the flame behavior, combustion dynamics, and NOx emission characteristics for hydrogen co-firing with the EV burner which is the first stage combustor of GT24. It was confirmed that as the hydrogen co-firing rate increases, the NOx emission increases. This change was elucidate to be the result of a combination of changes in penetration depth due to changes in fuel density, reduction in fuel mixing due to changes in flame position due to increased flame propagation speed, and oscillation of fuel mixedness due to combustion instability. Through pressurization tests in the range of 1.3 to 3.1 bar, NOx emission characteristics under high-pressure operating conditions were predicted, and based on this, the hydrogen co-firing limits of the EV burner was evaluated.
곽종구,M. H. WOO,T. Rhee 한국원자력학회 2019 Nuclear Engineering and Technology Vol.51 No.7
The confinement degradation of the energetic particles during RMP would be a key issue in success of realizing the successful energy production using fusion plasma, because a 3.5 MeV energetic alpha particle should be able to sustain the burning plasma after the ignition. As KSTAR recent results indicate the generation of high-performance plasma(βp∼3), the confinement of the energetic particles is also an important key aspect in neutral beam driven plasma. In general, the measured absolute value of the neutron intensity is generally used for to estimating the confinement time of energetic particles by comparing it with the theoretical value based on transport calculations. However, the availability of, but for its calculation process, many accurate diagnostic data of plasma parameters such as thermal and incident fast ion density, are essential to the calculation process. In this paper, the time evolution of the neutron signal from an He3 counter during the beam blank has permitted to facilitate the estimation of the slowing down time of energetic particles and the method is applied to investigate the fast ion effect on ELM suppressed KSTAR plasma which is heated by high energy deuterium neutral beams.
곽종구,S.C. Hong 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.6
Deuterium-tritium reaction is the most promising one in term of the highest nuclear fusion cross-sectionfor the reactor. So it is one of urgent issues to develop materials and components that are simultaneouslyresistant to high heat flux and high energy neutron flux in realization of the fusion energy. 2.45 MeVneutron production was reported in D-D reaction in KSTAR and regarded as beam-target is the dominantprocess. The feasibility study of KSTAR to wide area neutron source facility is done in term of D-D and D-Treactions from the empirical scaling law from the mixed fast and thermal stored energy and its projection to cases of heating power upgrade and DT reaction is done
김선호,곽종구 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.10
It is important for an ICRF full wave code to simulate the SOL (Scrape Off Layer) plasma as well as the core inside of the LCFS (Last Closed Flux Surface) for the precise prediction of the coupling between the antenna and the core plasma in tokamaks. To this end, a two dimensional full wave code based on a Fourier spectral algorithm has been developed. The spectral algorithm and procedures are described and the simulation results for the minority heating in KSTAR are reported including electric field, power absorption and power flux