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Auto-ignitions of a methane/air mixture at high and intermediate temperatures

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Abstract

A rapid compression machine (RCM) and a shock tube (ST) have been employed to study ignition delay times of homogeneous methane/air mixtures at intermediate-to-high temperatures. Both facilities allow measurements to be made at temperatures of 900–2000 K, at pressures of 0.38–2.23 MPa, and at equivalence ratios of 0.5, 1.0, and 2.0. In ST experiments, nitrogen served as a diluent gas, whereas in RCM runs the diluent gas composition ranged from pure nitrogen to pure argon. Recording pressure, UV, and visible emissions identified the evolution of chemical reactions. Correlations of ignition delay time were generated from the data for each facility. At temperatures below 1300 K, a significant reduction of average activation energy from 53 to 15.3 kcal/mol was obtained. Moreover, the RCM data showed significant scatter that dramatically increased with decreasing temperature. An explanation for the abnormal scatter in the data was proposed based on the high-speed visualization of auto-ignition phenomena and experiments performed with oxygen-free and fuel-free mixtures. It is proposed that the main reason for such a significant reduction of average activation energy is attributable to the premature ignition of ultrafine particles in the reactive mixture.

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Authors and Affiliations

  1. A.V. Luikov Heat and Mass Transfer Institute, Minsk, Belarus

    V. V. Leschevich, V. V. Martynenko, O. G. Penyazkov, K. L. Sevrouk & S. I. Shabunya

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  1. V. V. Leschevich
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  2. V. V. Martynenko
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  3. O. G. Penyazkov
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  4. K. L. Sevrouk
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  5. S. I. Shabunya
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Correspondence to V. V. Leschevich.

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Communicated by L. Bauwens.

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Leschevich, V.V., Martynenko, V.V., Penyazkov, O.G. et al. Auto-ignitions of a methane/air mixture at high and intermediate temperatures. Shock Waves 26, 657–672 (2016). https://doi.org/10.1007/s00193-016-0665-9

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  • DOI: https://doi.org/10.1007/s00193-016-0665-9

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