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- W2332583102 abstract "The propagation of a triple flame in partially premixed and nonpremixed jet modes is investigated both experimentally and numerically. The flame is ignited in a nonuniform jet mixing layer downstream of the burner. The flame propagation speed is inferred from the images recorded using a high-speed video camera. A time-dependent computational model is used to simulate the transient ignition and flame propagation phenomena under normal-gravity conditions. The model employs a detailed description of methane-air chemistry and transport properties. Following ignition in a nonuniform mixture, a welldefined triple flame is formed that propagates upstream toward the burner for both the partially premixed and nonpremixed jet modes. The flame is subjected to high unsteady stretch at the triple point during its propagation, particularly for the nonpremixed jet mode. The flame shape and structure change significantly during propagation, causing some ambiguity in defining the triple point. The numerical results indicate that the triple point, which can be defined by the intersection of the specific OH isocontour and the stoichiometric mixture fraction line, propagates along the stoichiometric mixture fraction line. The numerical results indicate that around the triple point there exists a region where the equivalence ratio is less than unity and hence where the Lewis number for the methane-air mixture is also less than unity. The greater diffusivity of fuel compared to that of heat favors the focusing of reactant to defocusing of heat near the flame front. Thus it enhances the flame temperature near the flame front, and promotes flame propagation." @default.
- W2332583102 created "2016-06-24" @default.
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- W2332583102 date "2002-07-07" @default.
- W2332583102 modified "2023-09-24" @default.
- W2332583102 title "Transition of Propagating Triple Flames to Burner Attached Flames in an Axisymmetric Jet" @default.
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- W2332583102 doi "https://doi.org/10.2514/6.2002-4023" @default.
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