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액체 중심 전단 동축 인젝터의 저압 상태 액주 분열 과정 및 미립화 특성 연구
이인철,김도헌,구자예 한국항공우주학회 2011 한국항공우주학회 학술발표회 논문집 Vol.2011 No.4
액체 중심 전단 동축 인젝터는 액체 제트를 기체 제트의 전단력으로 분열시켜 미립를 향상시키며, 이러한 2유체 전단 동축 인젝터는 고효율 연소 시스템, 산업용 코팅, 반도체 세정 등에 사용이 가능하다. 본 연구에서는 기체 전단력에 의한 초기 액주 분열 과정과 인젝터 기하학적 형상 변화에 따른 미립화 특성을 파악하기 위해 3.0 bar 이하의 분사 압력 조건에서 액체 중심형 전단 동축 인젝터를 사용하여 실험하였다. 저압 분사 조건에서 분무되는 액체 제트는 액주 형태로 분무되며, 이러한 액주는 기체 제트의 전단력에 의해 수 msec 이내에 액적으로 미립화된다. 액체 제트의 미립화 특성과 관련된 변수 중 SMD는 액체 중심 노즐 주위의 환형 기체 노즐 토출구 직경이 증가 할수록 감소하였으며, 기체 제트의 유량이 증가함에 따라 SMD가 감소하는 경향을 나타내었다. A shear coaxial injector which is liquid-centered type breaks low pressure liquid jet by a shear force of gas jet and makes a good spray characteristics. The injector which uses two-phase fluids can be used for high efficiency combustion system, industrial coatings systems and semiconductor cleaning. In this study, to investigate initial break-up characteristic by the shear force of gas jet and to identify the atomization characteristics by geometric shape change of the injector, the experiment was carried out by using the liquid-centered shear coaxial injector under the pressure condition with 0.5 bar. The liquid jet was injected into the shape of a liquid column under low-pressure condition, the column was atomized to droplets within a few msec by the shear force of the gas jet. In addition, as increasing gas nozzle diameter and volume flow rate of gas jet, SMD which represents the atomization characteristics decreased.
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이인철,LEE In-Cheol 한국수산과학회 2001 한국수산과학회지 Vol.34 No.6
To predict the seasonal variation of dissolved oxygen (DO) in Hakata bay, Japan, possible 20 time-series of different hourly-solar-radiation intensities were generated based on stochastically changing solar radiation intensity, and a numerical simulation on dissolved oxygen (DO) was carried out for each time series by using the Sediment-Water Ecological Model (SWEM). The model, consisting of two sub-models with hydrodynamic and biological models, simulates the circulation process of nutrient between water column and sediment, such as nutrient regeneration from sediments as well as ecological structures on the growth of phytoplankton and zooplankton, The results of the model calibration followed the seasonal variation of observed water quality well, and generated cumulative-frequency-distribution (CFD) curves of daily solar radiation agreed well with observed ones, The simulation results indicated that the exchange of sea water would have a great influence on the DO concentration, and that the concentration could change more than 1 mg/L in a day. This prediction method seems to be an effective way to examine a solution to minimize fishery damage when DO is depleted.
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155mm 포탄 및 C-4 90kg 기폭에 의한 야전구축 방호자재 및 구조체용 신방호자재의 방호성능 평가
이인철,김홍섭,남정수,김석봉,홍원희,김규용,Lee, In-Cheol,Kim, Hong-Seop,Nam, Jeong-Soo,Kim, Suk-Bong,Hong, Won-Hee,Kim, Gyu-Yong 한국군사과학기술학회 2013 한국군사과학기술학회지 Vol.16 No.4
In this study, it was evaluated the protective performance of the protection material for filed of the army by impact of fragment from the explosion of 155mm artillery shell to propose the improvement items. And it was evaluated the protection materials for structural boby such as corrugated steel plate, concrete block, prevention paint of explosion, aluminum foam and concrete T-wall by impact of fragment of 155mm artillery shells and explosion-induced pressure of C-4 explosive. As a result, protective performance of the existing protective material was superior but reinforcement is necessary for secondary damage because sand is leaking. The protective performance of new protective materials was greater than existing protective materials. And it can be used for protective materials.
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