Natural gas ignition delay times behind reflected shock waves: Application to modelling and safety |
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Authors: | Email author" target="_blank">N?LamoureuxEmail author C?-E?Paillard |
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Institution: | (1) Laboratoire de Combustion et Systèmes Réactifs - CNRS 1C, avenue de la recherche scientifique, 45071 Orléans, Cedex 2, France |
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Abstract: | Ignition delay times have been measured behind reflected shock waves using infrared and ultraviolet emission spectroscopies in the wide ranges of temperature (1485-1900 K), pressure (0.3-1.3 MPa), equivalence ratio (0.5-2) and dilution with argon (95-99%). For a mixture composed of several alkanes, it has been shown that the ignition delay can be evaluated from a combination of individual expressions obtained for each alkane (methane, ethane and propane). This method is applied to ignition delay time calculations for mixtures of several natural gases and validated with a particular Algerian natural gas. The measured ignition delay time are compared with those computed using a detailed kinetic mechanism. Agreement is generally satisfactory but the deviation between measurements and calculations increases when the ethane relative fraction increases in natural gas. Dynamic parameters of detonation in air are evaluated from these correlations. The predicted kinetic parameters of detonation (cell width) with a natural gas from Abu Dhabi, especially rich in ethane, are about half as those estimated with a Russian natural gas.Received: 16 April 2002, Accepted: 4 October 2002, Published online: 8 May 2003 |
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Keywords: | Natural gas Kinetic modelling Ignition delay time Detonation |
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