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ISSN Печать: 1044-5110
ISSN Онлайн: 1936-2684
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OPTICAL MEASUREMENTS OF THE REACTING TWO-PHASE FLOW IN A REALISTIC GAS TURBINE COMBUSTOR AT ELEVATED PRESSURES
Краткое описание
A rectangular sector of a realistic axially staged gas turbine combustor of Rolls-Royce Deutschland was operated at elevated pressures. Optical measurements of the reacting two-phase flow were performed using phase Doppler anemometry (PDA) and two planar light sheet techniques, laser-induced fluorescence (LIF) and Mie scattering. Beside the interpretation of the results of the measurements, the experience gathered with the techniques is analyzed with respect to the applicability, the accuracy, and the kind of information they deliver. The constraints, e.g., limited optical access, combustor with several injectors in line, and strong soot luminescence, affecting the optical setup for PDA measurements are discussed. The PDA measurements were conducted at a combustor inlet pressure of p = 6 bar. With an estimated error in the size measurement of up to Δ = 10% caused by the change of the refractive index, it was still possible to obtain quantitative results of the mean diameter. The error of the liquid volume concentration is higher and difficult to assess. Beside the unknown refractive index of the droplets, the constantly changing size and shape of the measurement volume due to beam steering effects contributed significantly to the measuring error. Images of the planar Mie scattering are used as a consistency check of the PDA data. The light sheet techniques deliver supplementary information. Imaging of kerosene LIF of an isothermal spray at atmospheric pressure was used to calculate the liquid volume concentration. A comparison with results from PDA measurements revealed a good agreement. Under reacting conditions, kerosene LIF was limited to qualitative information on the distribution of liquid and vaporized fuel mainly because of the temperature dependency of the fluorescence quantum yield. At higher pressure, the applicability of LIF was limited by the absorption of the UV laser light in the dense spray. Imaging of the planar Mie scattered light was possible at combustor inlet pressures up to p = 20 bar, giving qualitative information on the distribution of the liquid fuel.
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Magnotti Gina M., Genzale Caroline L., A Novel Approach to Assess Diesel Spray Models using Joint Visible and X-Ray Liquid Extinction Measurements, SAE International Journal of Fuels and Lubricants, 8, 1, 2015. Crossref
-
Hanson Ronald K., Applications of quantitative laser sensors to kinetics, propulsion and practical energy systems, Proceedings of the Combustion Institute, 33, 1, 2011. Crossref
-
Magnotti G.M., Genzale C.L., Detailed assessment of diesel spray atomization models using visible and X-ray extinction measurements, International Journal of Multiphase Flow, 97, 2017. Crossref
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Magnotti Gina M., Genzale Caroline L., Recent Progress in Primary Atomization Model Development for Diesel Engine Simulations, in Two-Phase Flow for Automotive and Power Generation Sectors, 2019. Crossref
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Dafsari Reza Alidoost, Vashahi Foad, Chandrahasan Rakhul, Lee Jeekeun, Effect of aviation fuel temperature on refractive index in droplet size measurement using phase Doppler anemometry, Measurement Science and Technology, 30, 7, 2019. Crossref
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Wood Eric J., McGann Brendan, Motily Austen, Min Kyungwook, Kim Keunsoo, Lee Tonghun, Mayhew Eric, Mitsingas Constandinos M., Temme Jacob, Kweon Chol-Bum, Kastengren Alan, Impact of Fuel Properties on Combusting Jet Fuel Spray Breakup, Analyzed using High-Speed Phase Contrast Imaging, AIAA Scitech 2020 Forum, 2020. Crossref