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OpenFOAM을 이용한 난류연소현상 해석 및 내연기관에의 적용
한가람(Karam Han),임성한(Seonghan Im),허강열(Kang Y. Huh) 한국연소학회 2010 KOSCOSYMPOSIUM논문집 Vol.- No.41
OpenFOAM(Open Field Operation And Manipulation) is based on the object oriented language and has been developed as an alternative to commercial CFD tools for industrial application. The advantages of open source CFD allow users to create a more extensive and customized code according to users needs, whereas the commercial tools have difficulty to add or modify any user defined code. To perform IC engine simulation an automatic mesh motion algorithm is built into OpenFOAM. OpenFOAM also provides users with many solvers such as heat transfer and multi phase flow with combustion. In this study simulation of sydney bluff-body HM1 flame, IC engines and gas turbine combustion were performed by OpenFOAM to analyze the turbulent combustion problems. The PaSR(Partially Stirred Reactor) model was applied for a CI engine and gas turbine, while the b-Ξmodel was applied for an SI engine. Results were compared with measurements for some typical test cases.
Numerical Analysis of Turbulent Combustion and Emissions in an HRSG System
장지훈,한가람,박호영,이욱륜,허강열,Jang, Jihoon,Han, Karam,Park, Hoyoung,Lee, Wook-Ryun,Huh, Kangyul Korea Electric Power Corporation 2019 KEPCO Journal on electric power and energy Vol.5 No.2
The combined cycle plant is an integration of gas turbine and steam turbine, combining the advantages of both cycles. It recovers the heat energy from gas turbine exhaust to use it to generate steam. The heat recovery steam generator plays a crucial role in combined cycle plants, providing the link between the gas turbine and the steam turbine. Simulation of the performance of the HRSG is required to study its effect on the entire cycle and system. Computational fluid dynamics has potential to become a useful to validate the performance of the HRSG. In this study a solver has been implemented in the open source code, OpenFOAM, for combustion simulation in the heat recovery steam generator. The solver is based on the steady laminar flamelet model to simulate detailed chemical reaction mechanism. Thereafter, the solver is used for simulation of HRSG system. Three cases with varying fuel injections and gas turbine exhaust gas flow rates were simulated and the results were compared with measurements at the system outlet. Predicted temperature and emissions and those from measurements showed the same trend and in quantitative agreement.
가스터빈 열 회수 증기 발생기의 배출 가스 예측 모사 해석
한우주(Woojoo Han),장지훈(Jihoon Jang),이영재(Youngjae Lee),한가람(Karam Han),허강열(Kang Y. Huh) 한국연소학회 2014 KOSCOSYMPOSIUM논문집 Vol.2014 No.11
We performed computational simulation for a heat recovery steam generator to predict emissions (especially carbon monoxide) and compare the results with experimental data. We used the steady laminar flamelet model(SLFM) which can consider detailed chemical mechanisms. To reduce the number of grid, we simplified the geometry of the whole heat recovery steam generator. In conclusion, the trend of simulation results is good agreement with experimental data.
OpenFOAM을 활용한 촤 고유 반응 모델 구현 및 영향 평가
장권우(Kwonwoo Jang),한가람(Karam Han),허강열(Kang Y. Huh) 한국연소학회 2020 한국연소학회지 Vol.25 No.1
Three intrinsic char reaction models of unreacted shrinking core, random pore and char burnout kinetics (CBK/E) were implemented in the open source code OpenFOAM. Evaluation of the models was performed for a 2.1 ㎿e laboratory-scale furnace and a 500 ㎿e tangential-fired full-scale boiler. For the laboratoryscale furnace there was minor difference among the char reaction models except for the random pore model. For the industrial boiler the influence of the char reaction models was found insignificant in the overall temperature distribution. On the other hand results showed that the CBK/E model predicts the most accurate char burnout rate in the industrial boiler.
저부하 운전 시 절탄기 바이패스 적용에 따른 석탄화력발전소 성능 예측
최병선(Byeongseon Choi),한가람(Karam Han),김정면(Jeong-Myun Kim),최동권(Dongkwon Choi),이욱륜(Wook-Ryun Lee) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
As the amount of renewable energy generation increases, flexible resources are needed to stably operate the power system. Coal-fired power plants also need to improve their flexibility in order to contribute to stabilizing the power system, such as lowering the minimum load, increasing the ramp rate, and reducing the start-up time. However, as the Selective Catalytic Reduction(SCR) inlet gas temperature decreases during low-load operation, the denitrification efficiency decreases and a large amount of nitrogen oxide is discharged into the atmosphere. In this study, the SCR inlet temperature was maintained above 300°C by applying the economizer bypass to maintain high catalyst activity at low-load, and then the performance of the coal-fired power plant was predicted. When the economizer bypass is applied, the amount of heat supplied to the economizer is reduced and water cannot be sufficiently heated, so additional fuel is required, which increases the heat rate.
OpenFOAM을 이용한 내연기관과 가스터빈 연소기 시뮬레이션 해석
임성한(Seonghan Im),한가람(Karam Han),허강열(Kang Y. Huh) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
OpenFOAM(Open Field Operation And Manipulation) is based on the object oriented language and has been developed as an alternative to commercial CFD tools for industrial application. The advantages of open source CFD allow users to create a more extensive and customized code according to users needs, whereas the commercial tools have difficulty to add or modify any user defined code. To perform IC engine simulation an automatic mesh motion algorithm is built into OpenFOAM. OpenFOAM also provides users with many solvers such as heat transfer and multi phase flow with combustion. In this study simulation of IC engines and gas turbine combustion were performed by OpenFOAM to analyze the turbulent combustion problems. The PaSR(Partially Stirred Reactor) model was applied for a CI engine and gas turbine, while the b-Ξ model was applied for an SI engine. Results were compared with measurements for some typical test cases.
장지훈(Jihoon Jang),한가람(Karam Han),유근실(Geun Sil Yu),이욱륜(Wook Ryun Lee),임현수(HyeonSoo Lim),박호영(Ho Young Park) 한국연소학회 2019 한국연소학회지 Vol.24 No.2
Devolatilization behavior of pulverized coal in a drop tube furnace (DTF) has been calculated with the measured gas temperature and velocity. The particle temperature and velocity were calculated from the energy and momentum equations of particle by using the fourth order Runge-Kutta method. The volatile evolved from the particle along with the reactor tube was also calculated varying the wall temperature of reaction tube as well as the particle diameter. The optimal kinetic parameters of subbituminous coal were obtained from the volatile evolution data of the devolatilization experiment in the DTF by error minimization.
탈휘발 예측 코드를 활용한 탈휘발 및 촤반응 모델 평가
정대로(Daero Joung),한가람(Karam Han),허강열(Kang Y. Huh),박호영(Hoyoung Park) 한국연소학회 2012 한국연소학회지 Vol.17 No.2
In this study, pre-processor code based on structural behavior of coal is applied to predict yields, pyrolysis rate and compositions of volatile and char. These parameters are used in the devolatilization and char burnout submodels as user-defined functions of commercial CFD code. The predicted characteristics of these sub-models are compared with those employing the conventional model based on experiment and validated against the measurement of a 2.1 MW swirling pulverized coal flame in a semi-industrial scale furnace. And the influence of the turbulence-chemistry interaction on pulverized coal combustion is analyzed.
최동권(Dongkwon Choi),한가람(Karam Han),김정면(JeongMyeon Kim),최병선(ByeongSeon Choi),송승헌(Seungheon Song),우주희(Joohee Woo),이욱륜(Wookryun Lee) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
As power generation methods based on renewable energy are distributed, the development of flexible operation technologies for existing thermal power generation is emerging. During flexible operation, life time reduction due to combustion instability and thermal fatigue is predicted and sufficient research is needed. In this study, the combustion according to the shape information of the boiler nozzle tip is analyzed, and the combustion point is analyzed by the thickness of the nozzle tip into two stage.