Numerical study on the behavior of non-premixed flames in twin-jet counterflow with one-step reaction model
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The structure of a non-premixed flame in a twin-jet counterflow was simulated using reduced and detailed mechanisms for methane fuel diluted with nitrogen. A non-premixed flame with an advancing edge was stabilized with a trail flame, similarly to a conventional counterflow flame. At large strains, the trailing flames were extinguished, such that a petal-shaped flame with a retreating edge existed. Various types of methane non-premixed flames (conventional counterflow flame, fuel-sharing and oxidizer-sharing crossed twin-jet counterflow flames, and petal-shaped flame) were simulated in the twin-jet counterflow configuration depending on the combination and dilution of the initial fuel and oxidizer supplied to each nozzle. The cross-condition in the twin-jet counterflow flames coincided with the transition from fuel-to oxidizer-sharing flames. In particular, the extinction characteristics of methane non-premixed flames were investigated in crossed twin-jet counterflow configuration. In addition, petal-shaped flames existed only in the region favoring the formation of oxidizer-sharing flames.
Abstract
The structure of a non-premixed flame in a twin-jet counterflow was simulated using reduced and detailed mechanisms for methane fuel diluted with nitrogen. A non-premixed flame with an advancing edge was stabilized with a trail flame, similarly to a conventional counterflow flame. At large strains, the trailing flames were extinguished, such that a petal-shaped flame with a retreating edge existed. Various types of methane non-premixed flames (conventional counterflow flame, fuel-sharing and oxidizer-sharing crossed twin-jet counterflow flames, and petal-shaped flame) were simulated in the twin-jet counterflow configuration depending on the combination and dilution of the initial fuel and oxidizer supplied to each nozzle. The cross-condition in the twin-jet counterflow flames coincided with the transition from fuel-to oxidizer-sharing flames. In particular, the extinction characteristics of methane non-premixed flames were investigated in crossed twin-jet counterflow configuration. In addition, petal-shaped flames existed only in the region favoring the formation of oxidizer-sharing flames.
참고문헌 (10)
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