Measurement of Turbulent Flame Propagation Rates of Methane Using a New Facility
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This paper presents results from the turbulent flame speed experiments conducted in a recently developed fan-stirred, cylindrical flame bomb. The high-pressure vessel has four fans installed at its central circumference which generate homogeneous and isotropic turbulence with negligible mean flow. Using this arrangement, RMS turbulence intensity of 1.5 m/s with an integral length scale of 27 mm was measured at the lowest fan speed (8300 rpm). Turbulent combustion experiments of stoichiometric methane in air at 1 atm and 298 K were conducted. Schlieren imaging revealed a lamella-like flame surface which increased as the flame grew in size. A global displacement speed of 66 cm/s was measured when the flame diameter was twice the integral length scale. This value yielded a corresponding turbulent burning velocity of 129 cm/s. These turbulent propagation rates agree well with those obtained from the literature. 2013 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.
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51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition