Laser-based investigation of flame surface density and mean reaction rate during flame-wall interaction at elevated pressure |
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| Institution: | 1. Technical University of Darmstadt, Department of Mechanical Engineering, Reactive Flows and Diagnostics, Otto-Berndt-Str. 3, Darmstadt 64287, Germany;2. Barlow Combustion Research, Livermore, USA;1. Lehrstuhl für Thermodynamik, Technische Universität München, Garching, Germany;2. Institute for Advanced Study, Technische Universität München, Garching, Germany;3. Institute of Energy Systems and Fluid-Engineering, Zürich Univerity of Applied Sciences, Winterthur, Switzerland;1. State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, Anhui, 230026, China;2. School of Resources and Civil Engineering, Northeastern University, Shenyang, Liaoning, 110819, China;3. Warwick fire, School of Engineering, University of Warwick, Coventry, CV4 7AL, United Kingdom;1. Reaktive Strömungen und Messtechnik, Technische Universität Darmstadt, Jovanka-Bontschits-Straße 2, 64287 Darmstadt, Germany;2. Darmstadt Graduate School of Excellence Energy Science and Engineering, Technische Universität Darmstadt, Jovanka-Bontschits-Straße 2, 64287 Darmstadt, Germany;3. Energie- und Kraftwerkstechnik, Technische Universität Darmstadt, Jovanka-Bontschits-Straße 2, 64287 Darmstadt, Germany;4. Thermodynamik und Alternative Antriebe, Hochschule Darmstadt, Schöfferstraße 3, 64285 Darmstadt, Germany;1. Department of Engineering Physics and Computation, School of Engineering & Design, Technical University of Munich, Garching 85748, Germany;2. Department of Aerospace Engineering, Indian Institute of Technology Madras, Chennai 600036, India;3. Institute for Combustion Technology, German Aerospace Centre (DLR), Stuttgart 70569, Germany |
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| Abstract: | Velocities and flame front locations are measured simultaneously in a turbulent, side-wall quenching (SWQ) V-shaped flame during flame-wall interaction (FWI) at 1 and 3 bar by means of particle image velocimetry (PIV) and planar laser-induced fluorescence of the OH radical (OH-PLIF). The turbulent flame brush is characterized based on the spatial distribution of the mean reaction progress variable and a common direct method is used to derive the flame surface density (FSD) from the two-dimensional data by image processing. As the near-wall reaction zone is limited to a smaller region closer to the wall at higher pressure, higher peak values are observed in the FSD at 3 bar. A second definition of the FSD adapted for flames exposed to quenching is utilized similar to previous studies emphasizing the impact of FWI. The influence of the wall on the flame front topology is investigated based on a flame front-conditioned FSD and its variability within the data set. In a last step, an estimate of the mean reaction rate is deduced using an FSD model and evaluated in terms of integral and space-averaged values. A decreasing trend of integral mean reaction rate in regions with increasing flame quenching is observed for both operating conditions, but more pronounced at 3 bar. Space-averaged mean reaction rates, however, increase in the quenching region, as the size of the reaction zone decreases. |
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