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Chemical Kinetics Based Equations for Ignition Delay Times of Primary Reference Fuels Dependent on Fuel, O 2 and Third Body Concentrations and Heat Capacity
Technical Paper
2015-01-1810
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The ignition delay times of n-C7H16, i-C8H18, and a blend of them at different fuel, O2 and N2 concentrations were computed using a detailed chemical kinetic mechanism generated by KUCRS. For each fuel, the dependences of ignition delay time on fuel, O2 and third body concentrations and on the heat capacity of a mixture were distilled to establish a power law equation for ignition delay time. For n-C7H16, ignition delay time τhigh without low-temperature oxidation at a high initial temperature between 1000 K and 1200 K was expressed using the scaling exponents for fuel, O2 and third body concentrations and heat capacity of 0.54, 0.29, 0.08, and - 0.38, respectively. Low-temperature oxidation induction time τ1 at a low initial temperature between 600 K and 700 K was expressed using the scaling exponents for fuel, O2 and third body concentrations and heat capacity of 0.03, 0.18, 0.04, and - 0.17, respectively. Total ignition delay time with low-temperature oxidation was expressed as τlow = B·(τhigh - τ1) + τ1 using extrapolated τhigh and τ1. B was expressed as an exponential function dependent on fuel, O2 and third body concentrations and the heat capacity of a mixture, or set for 1 when initial temperature was higher than a high-temperature limit for low-temperature oxidation, which was also dependent on fuel, O2 and third body concentrations and the heat capacity of a mixture. The equations for τhigh and τlow successfully estimated the ignition delay time computed using the detailed chemical kinetic mechanism.
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Citation
Natakani, M., Kuwahara, K., Tada, T., Sakai, Y. et al., "Chemical Kinetics Based Equations for Ignition Delay Times of Primary Reference Fuels Dependent on Fuel, O2 and Third Body Concentrations and Heat Capacity," SAE Technical Paper 2015-01-1810, 2015, https://doi.org/10.4271/2015-01-1810.Also In
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