Effects of high pressure,high temperature and dilution on laminar burning velocities and Markstein lengths of iso-octane/air mixtures |
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| Authors: | Bénédicte Galmiche Fabien Halter Fabrice Foucher |
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| Affiliation: | 1. IVG, Institute for Combustion and Gas Dynamics – Reactive Fluids, University of Duisburg-Essen, Duisburg, Germany;2. ICARE, CNRS–INSIS, Orléans, France;1. Department of Flow, Heat and Combustion Mechanics, Ghent University, Sint-Pietersnieuwstraat 41, B-9000 Ghent, Belgium;2. Division of Combustion Physics, Lund University, Post Office Box, S-221 00 Lund, Sweden;3. Laboratory for Chemical Technology, Ghent University, Krijgslaan 281, S5, B-9000 Ghent, Belgium;1. Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ 08544, USA;2. SKLTCS, Department of Mechanics and Engineering Science, Peking University, Beijing 100871, China;3. Center for Combustion Energy, Tsinghua University, Beijing 100084, China;1. Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI 48109, USA;2. Department of Aerospace Engineering, University of Michigan, Ann Arbor, MI 48109, USA;3. Electrical & Mechanical Engineering College, Qingdao University, Qingdao, Shangdong 266071, China;4. Center for Combustion Energy and State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China |
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| Abstract: | Spherically expanding flames are employed to measure flame velocities, from which are derived the corresponding laminar burning velocities at zero stretch rate. Iso-octane/air mixtures at initial temperatures between 323 and 473 K, and pressures between 1 and 10 bar, are studied over an extensive range of equivalence ratios, using a high-speed shadowgraph system. Effects of dilution are investigated with nitrogen and for several dilution percentages (from 5 to 25 vol% N2). Over 270 experimental values have been obtained, providing an exhaustive data base for iso-octane/air combustion. Experimental results are in excellent agreement with recently published experimental data. An explicit correlation giving the laminar burning velocity from the initial pressure, the initial temperature, the dilution rate, and the equivalence ratio is finally proposed. Computed results using the two kinetic schemes and the Cantera code are compared to the present measurements. It is found that the mechanisms yield substantially higher values of laminar flame velocities than the present experimental results. Effects of oxygen enrichment are also investigated. A linear trend relating the percentage of oxygen in air and the unstretched laminar burning velocity is observed. Effects of high pressure, high temperature, and high dilution rate on Markstein lengths are also studied. As already done for the laminar burning velocity, an empirical correlation is proposed to describe the Markstein length for burned gases as a function of initial temperature and pressure, for equivalence ratios between 0.9 and 1.1, which has never been done before in the literature. |
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