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모형 가스터빈 연소기에서 NOx 배출량에 미치는 압력 및 비혼합도 효과 분석
왕위엔강,박순빈,손채훈 한국연소학회 2023 한국연소학회지 Vol.28 No.3
Pressure effects on NOx emission in a gas turbine combustor are numerically investigated in the present study. Initially, fully premixed flame condition with air and fuel injection at the combustor inlet is examined. Increasing pressure leads to a 0.08% rise in flame temperature and a significant 30% increase in NOx emissions. Technically premixed flame condition is then conducted. NOx emissions rise from 1.3 to 3 bar but decline beyond 3 bar due to combined pressure and mixing effects. Applying the NOx emission calibration formula, which accounts for pressure-induced changes while eliminating mixing influence, reveals a direct link between increased pressure and higher NOx emissions.
수소 충전 시스템용 리셉터클의 내부 압력 분포와 압력 강하에 관한 수치적 연구
왕위엔강,이승혁,손채훈,이세동,이현복 한국수소및신에너지학회 2023 한국수소 및 신에너지학회논문집 Vol.34 No.5
This study analyzes pressure distribution and pressure drop in the receptacle used in charging system of hydrogen fuel cell vehicles. The objective is to minimize receptacle-induced pressure drop by redesigning internal flow channels. Through numerical simulations, three receptacle variants are compared with a baseline case. Results show reduced pressure drop in the filter section. However, the check valve section exhibits higher pressure drop, requiring further improvement. By increasing throat diameter, pressure drop is decreased by 28% between inlet and outlet of the receptacle. This study shows the relationship between dynamic pressure and pressure drop, providing a guideline for receptacle performance optimization. The redesigned receptacle offers potential for enhancing hydrogen charging efficiency.
A Numerical Study on Gas Mixing Time in a Low-Pressure (Driven) Section of a Shock Tube
왕위엔강,조천현,손채훈,윤영빈,Wang, YuanGang,Cho, Cheon Hyeon,Sohn, Chae Hoon,Yoon, Youngbin The Korean Society of Combustion 2017 한국연소학회지 Vol.22 No.3
The fuel and oxidizer mixing process in the shock tube driven section is simulated numerically. The boundary condition is set based on an shock tube experimental condition. The objective is to predict the gas mixing time for experiments. In the experiment, the amount of fuel to be injected is determined in advance. Then, according to duration of fuel injection, 5 cases with the same fuel mass but different fuel mass flow rate are simulated. After fuel is injected into the driven section, the fuel and air will be mixed with each other through convection and diffusion processes. The mixing time is predicted numerically for experiments.
왕위엔강,김철진,손채훈,정인석 한국연소학회 2016 한국연소학회지 Vol.21 No.4
Pressure and temperature variations in a shock tube have been studied numerically by changing the diameter ratio of a driven part to a driver part . There are five cases where the adopted diameter ratios are 40%, 50%, 60%, 80%, and 100% respectively. The diameter of the driver part remains unchanged meanwhile the shock tube driven part diameter increases from 40% to 100% of the driver part. In the 100% ratio case, the driver part and driven parts have the same diameter of 66.9 mm. As the diameter ratio decreases, the pressure in the shock tube and available test time are increased.
A Study on Factors Affecting Combustion Characteristics of GCSC Injector
Yuangang Wang(왕위엔강),Jinwoo Son(손진우),Chae Hoon Sohn(손채훈) 한국연소학회 2019 한국연소학회지 Vol.24 No.1
Factors affecting the combustion characteristics of gas-centered swirl coaxial (GCSC) injectors are investigated numerically and experimentally. The factors are fuel volume flow rate (Qf), momentum flux ratio (MFR) and oxidizer/fuel (O/F) ratio. Firstly, the flame pattern becomes asymmetric as the fuel volume flow rate increases with a fixed momentum flux ratio. Then, the suitable fuel volume flow rate is selected according to the results. Next, the momentum flux ratio is increased by increasing the oxidizer volume flow rate (Qo) with a fixed fuel volume flow rate. Results show that the spreading angle decreases as momentum flux ratio increases, which agrees with our previous results. Finally, in order to check effects of oxidizer/fuel ratio, the Qf, Qo, and MFR are kept the same but the O₂ mole fraction of oxidizer is changed. From numerical and experimental results, it is found that flame pattern depends on oxidizer/fuel ratio and spreading angle increases as the O₂ mole fraction decreases.
Yuangang Wang(왕위엔강),Junho Park(박준호),Chae Hoon Sohn(손채훈) 한국연소학회 2020 한국연소학회지 Vol.25 No.4
Two factors that affect NOX emission of swirl premix burner are investigated numerically in the present study. The first one is air fuel ratio which is changed from 31.7 to 38.7 by keeping the air flow rate and decreasing the fuel flow rate. As the air fuel ratio increases, the mixing is enhanced and temperature of a model combustor decreases. Then, the NOX emission decreases. The second factor is the air slit area of the burner. Air slit area is reduced by changing the width of slit with 3 methods depending on the position, i.e., width decrease in the upper-side, the lower-side, and both sides. The velocity of air inflow increases as the air slit width decreases. Then, unmixedness inside the burner will be reduced, which results in reduction of NOX emission. This strong correlation between unmixedness and NOX emission verifies that NOX reduction can be attained by mixing enhancement of fuel and air inside the burner.