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• W2884771057 endingPage "1969" @default.
• W2884771057 startingPage "1961" @default.
• W2884771057 abstract "We investigate the influence of inflow velocity (Vin) and scalar dissipation rate (χ) on the flame structure and stabilisation mechanism of steady, laminar partially premixed n-dodecane edge flames stabilised on a convective mixing layer. Numerical simulations were performed for three different χ profiles and several Vin (Vin = 0.2 to 2.5m/s). The ambient thermochemical conditions were the same as the Engine Combustion Network’s (ECN) Spray A flame, which in turn represents conditions in a typical heavy duty diesel engine. The results of a combustion mode analysis of the simulations indicate that the flame structure and stabilisation mechanism depend on Vin and χ. For low Vin the flame is attached. Increasing Vin causes the high-temperature chemistry (HTC) flame to lift-off, while the low-temperature chemistry (LTC) flame is still attached. A unique speed SR associated with this transition is defined as the velocity at which the lifted height has the maximum sensitivity to changes in Vin. This transition velocity is negatively correlated with χ. Near Vin=SR a tetrabrachial flame structure is observed consisting of a triple flame, stabilised by flame propagation into the products of an upstream LTC branch. Further increasing the inlet velocity changes the flame structure to a pentabrachial one, where an additional HTC ignition branch is observed upstream of the triple flame and ignition begins to contribute to the flame stabilisation. At large Vin, the LTC is eventually lifted, and the speed at which this transition occurs is insensitive to χ. Further increasing Vin increases the contribution of ignition to flame stabilisation until the flame is completely ignition stabilised. Flow divergence caused by the LTC branch reduces the χ at the HTC branches making the HTC more resilient to χ. The results are discussed in the context of identification of possible stabilisation modes in turbulent flames." @default.
• W2884771057 created "2018-08-03" @default.
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• W2884771057 date "2019-01-01" @default.
• W2884771057 modified "2023-10-04" @default.
• W2884771057 title "Structure and propagation of two-dimensional, partially premixed, laminar flames in diesel engine conditions" @default.
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• W2884771057 doi "https://doi.org/10.1016/j.proci.2018.06.169" @default.
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