• Research Article

    Study of the Effect of Fuel Bed Thickness on Surface Fire Spread using Physics-based Simulation

    물리기반 시뮬레이션을 통한 산불 지표화 확산의 연료 베드 두께 영향 연구

    Kyeongnam Kwon, Ye-Eun Lee, Seong-kyun Im

    권경남, 이예은, 임성균

    This study analyzes surface fire spread under varying fuel thickness and wind speed using a physics-based simulation. A small wind tunnel experiment … + READ MORE
    This study analyzes surface fire spread under varying fuel thickness and wind speed using a physics-based simulation. A small wind tunnel experiment was conducted to validate the simulation, and the predicted flame spread rate showed less than 15% error compared with the experimental results. To overcome the limitations of the wind tunnel experiment, including wall effects and limited fuel load per unit length, additional simulations were configured to represent unretarded flame spread. Parametric simulations were performed by varying fuel bed thickness, bulk fuel density, and wind speed. The results indicate that the flame spread rate decreases with increasing bulk fuel density due to reduced oxygen availability and increased heat absorption. Furthermore, the spread rate converges beyond a certain fuel bed thickness, indicating the existence of an effective burning depth. These results highlight limitations of empirical wildfire spread models and provide insights for improving wildfire spread prediction. - COLLAPSE
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    30 June 2026

  • Research Article

    Early Detection of High-Frequency Combustion Instability Using Deep Learning Model

    딥러닝 모델을 이용한 고주파 연소 불안정 조기 감지

    Gyeonghyun Han, Kyu Tae Kim

    한경현, 김규태

    This study examines the feasibility of real-time early detection of combustion instability using a ResNet-18 model trained on recurrence plot images derived … + READ MORE
    This study examines the feasibility of real-time early detection of combustion instability using a ResNet-18 model trained on recurrence plot images derived from dynamic pressure signals. Experiments were conducted in a hydrogen-fueled premixed combustor by gradually increasing the fuel flow rate from three stable initial velocities, which induced several high-frequency instability modes. A model trained on a single mode could detect instability onset, but its performance depended on the frequency difference between the trained and target instability modes. A combined-frequency model showed effective detection performance, although improper frequency selection caused overly sensitive responses in stable regions. These results indicate that robust early detection requires not only multi-band training, but also careful selection of representative instability frequencies. - COLLAPSE
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    30 June 2026

  • Technical Notes

    A Review of Industrial Hydrogen Burner Combustion Technology

    산업용 수소버너 연소 기술 동향

    Minho Kim, Yong Jea Kim, Kangmin Kim, Taeheum Park, Woosang Lee, Dong-hyuk Shin

    김민호, 김용제, 김강민, 박태흠, 이우상, 신동혁

    This study investigates recent developments in industrial hydrogen burner combustion technology. Since the Paris Climate Agreement in 2015, carbon neutrality has become … + READ MORE
    This study investigates recent developments in industrial hydrogen burner combustion technology. Since the Paris Climate Agreement in 2015, carbon neutrality has become a global priority. Consequently, decarbonizing the industrial combustion sector, a major contributor to global CO2 emissions, has emerged as a pressing issue. As a carbon-free fuel, hydrogen has gained focus as a viable alternative. A successful transition to hydrogen fuel requires not only developments in combustion technology but also a stable hydrogen supply infrastructure and NOX emission reduction technologies. To support this transition, this study reviews the hydrogen policies and NOX emission regulations of major countries, alongside current trends in hydrogen burner combustion technology. - COLLAPSE
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    30 June 2026

  • Research Article

    Fundamental Study on CFD-Based Derivation of Turbine Inlet Acoustic Boundary Conditions for Gas Turbine Combustion Instability Modeling

    가스터빈 연소불안정 모델링을 위한 CFD 기반 터빈 입구 음향 경계조건 도출 기초 연구

    Juhwan Lee, Daesik Kim

    이주환, 김대식

    Combustion instability in gas turbine combustors is strongly influenced by the acoustic boundary conditions at the inlet and outlet, and in particular, … + READ MORE
    Combustion instability in gas turbine combustors is strongly influenced by the acoustic boundary conditions at the inlet and outlet, and in particular, the acoustic characteristics at the turbine inlet are one of the primary factors governing the acoustic field inside the combustor. However, since the actual turbine inlet involves complex geometries and high-temperature, high-pressure operating conditions, acoustic boundary conditions at the turbine inlet are often simplified or arbitrarily assumed in numerical analyses. As a foundational step toward deriving acoustic boundary conditions from computational fluid dynamics (CFD) simulations, this study validates a procedure for computing reflection and transmission coefficients using compressible unsteady CFD analysis. A verification geometry incorporating a semi-cylindrical obstacle in a duct was modeled in two dimensions, and simulations were conducted under both quiescent and mean flow conditions. The computed results reproduced the overall frequency-dependent trends observed in existing experimental data, confirming that the CFD-based procedure can serve as a foundational analysis method for evaluating the acoustic response at the turbine inlet. - COLLAPSE
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    30 June 2026

  • Technical Notes

    Ignition System for Multi-Chamber Combustion Using a Small-Scale Pulse Detonation Engine (PDE)

    소형 펄스 데토네이션 엔진을 이용한 다중 연소실 점화장치

    Hyung-Seok Han

    한형석

    Rocket or air-breathing propulsion systems with multiple combustion chambers require simultaneous ignition across individual chambers. This study introduces a multi-point ignition system … + READ MORE
    Rocket or air-breathing propulsion systems with multiple combustion chambers require simultaneous ignition across individual chambers. This study introduces a multi-point ignition system using a pulse detonation engine (PDE), which can be fueled by engine propellants or pyrolyzed fuel products. A three-branched PDE with an inner diameter of 4.22 mm was constructed, and small-scale burners were integrated at the PDE exits. The operational and detonation characteristics were investigated as functions of the equivalence ratio and operating frequency. Comparisons of detonation velocities with Chapman- Jouguet (CJ) velocities showed similar overall trends; specifically, at operating frequencies of 1 Hz and 5 Hz, velocity deficits remained below 5%, except at an equivalence ratio of 0.6. Furthermore, secondary combustion tests using the small burners were carried out, observing both secondary ignition and stable combustion. - COLLAPSE
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    30 June 2026

  • Research Article

    Effects of Dilution on NOx Emission Characteristics of Partially Premixed H2/CO Flame

    부분 예혼합 H2/CO 화염에서 희석이 NOx 배출 특성에 미치는 영향

    Jaeyo Oh, Jisoo Yoon, Jeongjin Kim, Youngbin Yoon, Kyubok Ahn

    오재요, 윤지수, 김정진, 윤영빈, 안규복

    In this study, the effects of dilution on NOx emission characteristics from partially premixed H2/CO syngas flames were experimentally … + READ MORE
    In this study, the effects of dilution on NOx emission characteristics from partially premixed H2/CO syngas flames were experimentally investigated using a model gas turbine combustor. The influence of diluent type (N2 and CO2) and dilution placement (fuel-side and air-side) was examined to identify the key factors governing NOx formation. The results showed that NOx formation was primarily governed by the thermal NOx mechanism, with flame temperature being the dominant factor. Dilution effectively reduced NOx emissions by lowering flame temperature; however, the reduction efficiency strongly depended on dilution placement. Under lean conditions, fuel-side dilution was more effective than air-side dilution due to greater interaction with the reaction zone. Furthermore, CO2 dilution resulted in lower NOx emissions than N2 dilution even at similar heat capacity conditions. This indicates that NOx emission characteristics are influenced not only by thermal effects but also by mixing behavior and the chemical properties of the diluent. - COLLAPSE
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    30 June 2026
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Journal Informaiton Journal of the Korean Society of Combustion Journal of the Korean Society of Combustion
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