Flame propagation speed and Markstein length of spherically expanding flames: Assessment of extrapolation and measurement techniques
| Autor: | Joachim Beeckmann, Heinz Pitsch, Raik Hesse, Emilien Varea, Nabiha Chaumeix, J. Schaback |
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| Přispěvatelé: | Rheinisch-Westfälische Technische Hochschule Aachen (RWTH), Complexe de recherche interprofessionnel en aérothermochimie (CORIA), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU), Institut de Combustion, Aérothermique, Réactivité et Environnement (ICARE), Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut des Sciences de l'Ingénierie et des Systèmes (INSIS), RWTH Aachen University, Poux, Alexandre |
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Laminar flame speed [SPI] Engineering Sciences [physics] [SPI.FLUID]Engineering Sciences [physics]/Reactive fluid environment 020209 energy Mechanical Engineering General Chemical Engineering Extrapolation Context (language use) Laminar flow 02 engineering and technology Mechanics Combustion Flame speed Kinetic energy [SPI]Engineering Sciences [physics] 020401 chemical engineering Schlieren 0202 electrical engineering electronic engineering information engineering 0204 chemical engineering Physical and Theoretical Chemistry ComputingMilieux_MISCELLANEOUS |
| Zdroj: | 37th International Symposium On Combustion 37th International Symposium On Combustion, 2018, Dublin, Ireland Proceedings of the Combustion Institute Proceedings of the Combustion Institute, Elsevier, 2019, 37 (2), pp.1521-1528. ⟨10.1016/j.proci.2018.08.047⟩ |
| ISSN: | 1540-7489 |
| Popis: | Laminar burning velocities are of great importance in many combustion models as well as for validation and improvement of chemical kinetic schemes. Determining laminar burning velocities with high accuracy is quite challenging and different approaches exist. Hence, a comparison of existing methods measuring and evaluating laminar burning velocities is of interest. Here, two optical diagnostics, high speed tomography and Schlieren cinematography, are simultaneously set up to investigate methods for evaluating laminar flame speed in a spherical flame configuration. The hypothesis to obtain the same flame propagation radii over time with the two different techniques is addressed. Another important aspect is the estimation of flame properties, such as the unstretched flame propagation speed and Markstein length in the burnt gas phase and if these are estimated satisfactorily by common experimental approaches. Thorough evaluation of the data with several extrapolation techniques is undertaken. A systematic extrapolation approach is presented to give more confidence into results generated experimentally. The significance of the linear extrapolation routine is highlighted in this context. Measurements of spherically expanding flames are carried out in two high-pressure, high-temperature, constant-volume vessels at RWTH in Aachen, Germany and at ICARE in Orleans, France. For the discussion of the systematic extrapolation approach, flame speed measurements of methane / air mixtures with mixture Lewis numbers moderately away from unity are used. Conditions were varied from lean to rich mixtures, at temperatures of 298–373 K, and pressures of 1 atm and 5 bar. |
| Databáze: | OpenAIRE |
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