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Numerical Investigation on the Low-Temperature Ignition Characteristics of Alkanes/N-heptane Fuel Blends and Alcohols/N-heptane Fuel Blends
Author(s): 
Pages: 889-894
Year: Issue:  4
Journal: Journal of Engineering Thermophysics

Keyword:  dual fuelchemical kinetic modelinglow-temperature ignition inhibition effectalkanealcohol;
Abstract: As an alternative energy technology for internal combustion engines,dual fuel combustion,such as natural gas/diesel,LPG/diesel and alcohols/diesel,has been widely used.In order to understand deeply the inhibition effects of the ignited fuel on the low-temperature ignition of diesel,this study investigated low-temperature ignition characteristics of alkanes/n-heptane fuel blends and alcohols/n-heptane fuel blends with reaction kinetics model.Results show that,when the initial temperature is below 1000 K,the ignition delay abilities of ignited fuels are in order ethane>propane>n-butane> n-pentane>n-hexane.Beginning from n-pentane,the inhibition influence on the ignition of pilot fuel disappears.In addition,there is almost no low temperature reactivity in methanol or ethanol,which converts reactive OH into stable H2O2 in the temperature below about 1000 K.Because of reactions producing aldehyde and enol,the inhibition effect of alcohols on the ignition time of pilot fuel is stronger than of alkanes with the same carbon number.
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