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The effects of engine operational parameters on the auto-ignition chemistry of n-decane in a compression ignition engine environment
Dissertation   Open access

The effects of engine operational parameters on the auto-ignition chemistry of n-decane in a compression ignition engine environment

Yulei Li
Doctor of Philosophy (Ph.D.), Drexel University
May 2018
DOI:
https://doi.org/10.17918/78ah-9b86
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Abstract

Motor vehicles--Design and construction Fuel--Oxidation Automobiles--Motors--Preignition Mechanical Engineering
JP-8 is a jet fuel widely used by the U.S. military. The military has called for JP-8 to be used in all internal combustion applications, including compression ignition engines. To understand the combustion of JP-8 in these engines, an accepted procedure is to develop combustion models of simple mixtures of hydrocarbons, called surrogates, and their components. As part of a program to develop such models, the auto-ignition behavior of n-decane in a motored engine has been investigated. In-cylinder pressure was measured to indicate the overall reactivity behavior and quantify the effects of engine operational parameters on the auto-ignition of n-decane. Additionally, exhaust gas composition was analyzed by GC/MS to identify and measure stable intermediate species to deduce the key reaction pathways leading to auto-ignition. Furthermore, a new method that uses only pressure data was proposed and developed to identify the start of combustion. By applying this method, the in-cylinder conditions for pre-ignition point were used to predict the ignition of n-decane. Based on the in-cylinder conditions of pre-ignition point, a general pre-ignition limit line for n-decane was generated, taking dilution of residual gas, equivalence ratio, and compression ratio into account. This pre-ignition limit line will be useful for predicting the pre-ignition initiation during the oxidation of n-decane. Furthermore, it is a proof of the concept "pre-ignition limit line", which may be useful when generalized for all hydrocarbons. The measured species profiles from this study may be used in future work to develop detailed and reduced kinetic models for the auto-ignition and oxidation of JP-8 surrogate fuels.

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