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• W2025366867 endingPage "1006" @default.
• W2025366867 startingPage "999" @default.
• W2025366867 abstract "The structure and stabilisation mechanism of partially premixed, laminar, dimethyl ether (DME) flames are investigated using two-dimensional direct numerical simulation (DNS). The simulations are performed at a pressure of 40 atmospheres and at oxidiser temperatures of 700, 900, 1100, 1300, and 1500 K, while keeping the lift-off length approximately fixed by varying the inlet velocity. At this pressure, DME exhibits two stage ignition below approximately 1100 K and a negative temperature coefficient (NTC) regime from approximately 800–1100 K. The DNS results are investigated by considering the thermochemical structure of the flames and by applying a transport budget analysis to key chemical species. The results show a transition from a lifted flame stabilised by conduction and diffusion-assisted flame propagation to a flame stabilised by autoignition with increasing temperature. At 700 K, the flame has a classical tribrachial structure similar to freely propagating edge flames at non-autoignitive conditions. The intermediate temperature cases reveal a complex transition involving multiple heat release pathways upstream of the stabilisation point. At 900 K, the flame consists of a main-tribrachial structure and an additional upstream branch due to low temperature chemistry: this is termed a tetrabrachial flame. At 1100 and 1300 K, two upstream branches are observed in addition to the main tribrachial structure, one due to low temperature chemistry and the other due to high temperature chemistry, which initiates autoignition and stabilises the flame: these are termed pentabrachial flames. At 1500 K, the low temperature upstream branch is suppressed, so there is only one upstream branch due to high temperature chemistry which proceeds to autoignition, this flame has a tetrabrachial structure, but one which is different from that observed in the 900 K case." @default.
• W2025366867 created "2016-06-24" @default.
• W2025366867 creator A5022456080 @default.
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• W2025366867 creator A5069968308 @default.
• W2025366867 creator A5070157367 @default.
• W2025366867 date "2015-01-01" @default.
• W2025366867 modified "2023-10-04" @default.
• W2025366867 title "Polybrachial structures in dimethyl ether edge-flames at negative temperature coefficient conditions" @default.
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• W2025366867 doi "https://doi.org/10.1016/j.proci.2014.05.129" @default.
• W2025366867 hasPublicationYear "2015" @default.
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