• Technical Notes

    Reduction of Raman Spectroscopy Data for H2-CO2-Air Tubular Flame Measurements

    H2-CO2-공기 관상 화염 측정을 위한 라만 분광학 데이터 정리

    Dong Jin Cha, Darren C. Tinker, Carl A. Hall and Robert W. Pitz

    차동진, Darren C. Tinker, Carl A. Hall, Robert W. Pitz

    An approach of reducing spontaneous Raman spectroscopy data, based on the matrix inversion method which logically removes undesired sources of the Raman … + READ MORE
    An approach of reducing spontaneous Raman spectroscopy data, based on the matrix inversion method which logically removes undesired sources of the Raman scattering signals including cross-talk due to the signals from other species, is discussed. The approach contains extensive calibration of temperature-dependent system response. The Raman spectra of several cold and hot calibration flames and their resulting calibration matrix are elaborated. The structure of H2-CO2-air tubular flames, in terms of major species (CO2, O2, N2, H2O, and H2) concentrations and temperature, was successfully measured with the optical technique. The Raman spectra data used in this study are taken from a uniquely designed experimental apparatus – a tubular burner and Raman spectroscopy system at Vanderbilt University. The characteristic uncertainties for chemical species are approximately ±2% by mole fraction for hot products and ±0.5% for room temperature reactants. The approach described here for hydrogen/air tubular flames may be adapted to hydrocarbon/air tubular flames when other necessary major species, for example, CH4 and CO for methane/air tubular flame, are considered in the whole process. - COLLAPSE
    30 June 2022
  • Technical Notes

    A Review of Carbon Neutral Gas Turbine Combustion Technology

    탄소중립 가스터빈 연소 기술 동향

    Hyoungwoo Kim, Ukhwa Jin, Younggun Go, Minjun Choi, Inyeong Gu, Minha Baek, Kyu Tae Kim and Dong-hyuk Shin

    김형우, 진욱화, 고영건, 최민준, 구인영, 백민하, 김규태, 신동혁

    This report surveys recent developments of carbon-neutral gas turbine combustion technology. Since the Paris Climate Agreement in 2019, each country committed a … + READ MORE
    This report surveys recent developments of carbon-neutral gas turbine combustion technology. Since the Paris Climate Agreement in 2019, each country committed a nationally determined contribution (NDC) which identifies key targets to reduce the temperature rise. In order to meet the NDC, each government is pushing hard to reduce greenhouse gas emissions, and using carbon-neutral fuel is a straightforward way to reduce to achieve the goals. As carbon-neutral fuels such as hydrogen or ammonia have different thermodynamic and transport properties, it needs paradigm changes in many related sectors. Gas turbine is one of the sectors, and this report reviews ongoing progress and challenges centered around developing carbon-neutral gas turbine combustion technology. - COLLAPSE
    30 June 2022
  • Research Article

    A Study on the Combustion Characteristics of Biodiesel Emulsion Fuel Droplet Containing Water

    수분을 함유한 바이오디젤 에멀젼 연료 액적의 연소 특성 연구

    Yun Seok Song, Young Chan Lim and Hyun Kyu Suh

    송윤석, 임영찬, 서현규

    This study conducted droplet combustion experiments on diesel, palm oil, and canola oil containing water to compare and analyze droplet combustion characteristics. … + READ MORE
    This study conducted droplet combustion experiments on diesel, palm oil, and canola oil containing water to compare and analyze droplet combustion characteristics. This experiment was performed depending on the changes in various droplet diameters of 1.387 ~ 1.731 mm of diesel(D100), biodiesel(BDC100 and BDP100), and water emulsion diesel and biodiesel(D-W, BDC-W, and BDP-W) to compare combustion behaviors such as ignition delay, micro-explosion, flame extinction and lifetime. As a result of the experiments, viscosity makes micro-explosions strong, and strong micro-explosions have the effect of reducing flame extinction time and lifetime. The difference between a micro-explosion and ignition delay with diesel emulsion fuel and biodiesel emulsion fuel is considered to be the difference in properties between the two fuels. The emulsion fuels had a great influence on micro-explosion, flame extinction, and lifetime depending on the viscosity of the fuel. However, diesel emulsion fuels with weak micro-explosion showed increasing ignition delay due to the high latent heat of the water. Based on this, it plans to conduct experiments on the effect of the difference in fuel viscosity on combustion behavior. - COLLAPSE
    30 June 2022
  • Research Article

    Experimental Investigation of Self-excited Low-swirl Flame Dynamics with Different Blockage Ratios

    막힘률에 따른 저선회 화염 동역학에 대한 실험적 연구

    Jaheon Gu, Kihun Moon, Hyunwook Jegal and Kyu Tae Kim

    구자헌, 문기훈, 제갈현욱, 김규태

    The influence of the blockage ratio on low-swirl flame dynamics was experimentally investigated in a lean-premixed combustor. Here we test five different … + READ MORE
    The influence of the blockage ratio on low-swirl flame dynamics was experimentally investigated in a lean-premixed combustor. Here we test five different swirl injectors, one with high swirl and four with low swirl, all with different blockage ratios (β). We analyze a large experimental dataset of self-excited instability measurements, and show that instability amplitudes for the case of β = 0.75 tend to be remarkably attenuated. This is attributed to the development of out-of-phase modulations between the jet-stabilized flame in the inner section and the swirl-stabilized flame in the outer section. - COLLAPSE
    30 June 2022