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- W2105536558 abstract "An ignition delay correlation has been developed for iso-octane based on the functional behavior exhibited by a detailed chemical kinetic mechanism. The correlation employs a traditional Arrhenius-based, power law formulation, τ=AϕαpβχO2γ×exp(λ), including dependencies for equivalence ratio (ϕ), pressure (p) and oxygen percentage (χO2). However the exponents for these parameters, α, β, and γ, respectively, are expressed as third-order polynomials with respect to temperature in order to capture changes in functionality seen across different regimes. At very low temperatures α, β, and γ are forced to a constant value, as seen within the mechanism. The activation energy term, λ, is written as a combination of two quadratic expressions so that the behavior in the negative temperature coefficient (NTC) region can be captured. A pressure-dependent term is also included in the expression for λ in order to reduce the activation energy at higher pressures in the NTC region due to increased low temperature reactivity, and the appearance of cool flame, or low temperature heat release (LTHR). The resulting expression contains 37 constants. The new correlation is applicable over a wide range of conditions and can be used for data comparisons and mechanism evaluation, as well as systems-level engineering simulations. In this work experimental data from rapid compression machines (RCM) and shock tubes (ST) are compared through normalizing features of the correlation, and the performance of a detailed kinetic mechanism is evaluated based on the functional behavior of the α, β, γ and λ parameters. Six hundred and sixty-one (661) data points have been used to fit the 37 constants of the expression where the experimental conditions cover ϕ=0.2–2.0, p=1–60 atm, χO2=0.125–21% and T=650–2000 K. Data normalized through the correlation indicate a standard deviation of ±34%. Departures from the correlation can be attributed to an incomplete description of the functional dependencies, some inconsistencies with regard to diluent composition, experimental uncertainties, and facility-influenced phenomena. The experimental points have also been simulated using the LLNL detailed iso-octane mechanism, where the computed ignition delay times have been fit to the new correlation. Agreement and differences between the correlated experimental and simulation α, β, γ and λ functions are highlighted, where it is noted that there is a substantial discrepancy concerning the increased low temperature chemistry at high pressure. Implications for future engine design are discussed." @default.
- W2105536558 created "2016-06-24" @default.
- W2105536558 creator A5077064543 @default.
- W2105536558 date "2009-06-01" @default.
- W2105536558 modified "2023-09-26" @default.
- W2105536558 title "A chemical kinetically based ignition delay correlation for iso-octane covering a wide range of conditions including the NTC region" @default.
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- W2105536558 doi "https://doi.org/10.1016/j.combustflame.2009.01.018" @default.
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