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Combustion of High Molecular Weight Hydrocarbon Fuels and JP-8 at Moderate Pressures

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Technical Report,01 May 2012,30 Apr 2016

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University of California - San Diego La Jolla United States

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The objective of this research is to characterize combustion of high molecular weight hydrocarbon fuels and jet-fuels in particular JP-8 and surrogates of jet-fuels in laminar non-uniform flows at elevated pressures up to 2.5 M Pa. Experimental and kinetic modeling studies were carried out. Measurements include critical conditions of extinction and autoignition, and flame structure. The scientific questions that were addressed and answered are 1 How does pressure influence the critical conditions of extinction and autoignition 2 What surrogate best reproduces selected combustion characteristics of JP-8 at atmospheric and moderate pressure 3 What are possible chemical kinetic mechanisms for these surrogates 4 What is the influence of pressure on kinetic models. The concise answer to these questions are 1With increasing pressure strain rates at extinction in general decrease. Autoignition temperature decrease with increasing pressure. A key observation that was not known prior to this work was that the influence of low-temperature chemistry increase with increasing pressure. 2Surrogates of JP-8 were identified, 3 Chemical kinetic mechanisms were developed and tested. 4 Revisions were made to chemical kinetic mechanisms.

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