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파장 가변형 KrF 에시머 레이저를 이용한 층류 비예혼합 수소 화염에서의 2차원적 온도 및 농도 계측
김군홍,진성호,김용모,박경석,김세원,김경수,Kim, Gun-Hong,Jin, Seong-Ho,Kim, Yong-Mo,Park, Gyeong-Seok,Kim, Se-Won,Kim, Gyeong-Su 대한기계학회 2000 大韓機械學會論文集B Vol.24 No.12
Rayleigh scattering and laser induced predissociative fluorescence are employed for capturing two-dimensional images of temperature and species concentration in a laminar nonpremixed flame of a diluted hydrogen jet. Rayleigh scattering cross-sections are experimentally obtained ar 248nm. Dispersed LIPF spectra of OH and O$_2$ are also measured in a flame in order to confirm the excitation of single vibronic state of OH and O$_2$ .OH and O$_2$ are excited on the P$_1$(8) line of the A $^2\Sigma ^+(v^`=3) - X^2\pi (V^"=0)$ band and R(17) line of the Schumann-Runge band B $^3\Sigma _u^-(v^`=0) - X ^3\Sigma _g^-(v^"=6)$, respectively. Fluorescence spectra of OH and Hot O$_2$ are captured and two-dimensional images of the hydrogen flame field are successfully visualized.
제철소내 고온 슬라브 복사열을 이용한 열전 발전 해석용 OpenFOAM 코드 개발
김군홍(Gun-Hong Kim),주재헌(Jae-Hyun Joo),강덕홍(Duk-Hong Kang) 대한기계학회 2020 대한기계학회 춘추학술대회 Vol.2020 No.12
The steel-making industry is strongly required to develop new technologies for further energy conservation in view of energy security, high and volatile energy prices, and climate change. One of the key technologies to achieve the requirement is waste heat recovery. The present work describes the simulation of the thermoelectric generation (TEG) system using the waste heat of hot slab in the steel-making process. The code is implemented to model the TEG module with bulk-properties to simulate the power-generation. New radiative heat boundary code is implemented to ease a complex numerical treatment of fin-structure. Overall procedures to simulate the TEG-system for slab-yard are demonstrated. Through this first-stage study, it is found that the convective thermal condition is important to predict the thermal input into TEG-module.
김군홍(Gun-Hong Kim),홍주형(Joo-Hyoung Hong),박춘수(Chun-Su Park),이명훈(Myung-Hoon Lee),전완호(Wan-Ho Jeon) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
Continuous casting process is widely used for making mid stage of manufactured steel product Characteristics of steel flow in the mold is very important for mold design and SEN(Submerged Entry Nozzle) and Using CFD analysis, numerical approach to molten steel flow can be very useful in understanding its flow characteristics in the mold and also make us easily understand growing of solidification shell thickness near mold wall. This study was done for predicting solidification shell thickness in the beam blank model for continuous casting of steel, using commercial FVM Cartesian Solver, STREAM V6 For considering turbulent flow, the low Reynolds number κ-ε model was used. solidification of molten steel is calculated through the temperature recovery method. And this solidification model was also applied to benchmark cases for validating with experimental and numerical results of other researchers.
제철소 고열 슬라브 야적장내 복사열 활용 열전 시스템 해석기 개발 연구
김군홍(Gun-Hong Kim),주재헌(Jae-Hyun Joo),강덕홍(Duk-Hong Kang) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
Steel making is an energy intensive industry. Compared to other industries, steel industry has relatively large opportunity to reuse waste heat energy with high temperatures. It is well known that thermoelectric generator technology has a strong point to harvest waste thermal energy despite low power efficiency. This work describes the development of a simulator to calculate the generated power through a specified thermoelectric generator system, which is designed to covert the radiative heat energy to the available electric power. The developed simulator is based on 1D thermal system of TEG-system. User can specify the TEG system and calculate conjugate heat transfer and power generation. Validation shows that the simulator has sufficient predictability on calculating power generated according to thermal changes, temperatures of slab and coolant water. Since TEG system is installed in slab yard and environmental thermal flow changes naturally, deviations are inevitably observed.