Effects of Dilution on Turbulent Consumption Speeds of Jet Fuel Public Deposited

http://ir.library.oregonstate.edu/concern/undergraduate_thesis_or_projects/rb68xd82s

Copyright: May 9, 2016. Presented: May 23, 2016.

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  • Combustion systems for transportation applications typically use large hydrocarbon fuels in turbulent premixed or partially premixed environments. Combustion products can enter the reaction region through natural recirculation or combustion control mechanisms. The objective of this study is to characterize how dilution by combustion products affects the turbulent consumption speed for Jet-A/air mixtures. The turbulent consumption speed is a measure of the velocity the flame front propagates through the reactants. A Bunsen burner system was used that allows independent variation of Reynolds number, turbulence intensity, equivalence ratio, diluent type, and dilution concentration. Temporally averaged chemiluminescence images of the flame were acquired with an ICCD camera and analyzed to determine the turbulent consumption speed. Measurements and calculations were conducted for conditions where Jet-A was diluted by N2 and CO2, where the mole fraction of the diluents was selected to match the heat capacity of the mixtures. Laminar flame calculations showed that CO2 decreases the flame speed more than N2 due to its effect on the reaction chemical kinetics. For conditions similar to consumption speed measurements, dilution by N2 decreases the flame speed by 20% and CO2 results in a 30% decrease. Turbulent consumption speed measurements showed no sensitivity to diluent type or volume across all tested Reynolds numbers, equivalence ratios, and turbulence intensities. It is plausible that interactions between turbulence and the reaction chemistry offset any reduction in flame speed caused by the diluents. Future work should attempt to confirm observed trends and apply different measurement techniques to better characterize the flame front.
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  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2016-05-26T18:50:48Z (GMT) No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: bb87e2fb4674c76d0d2e9ed07fbb9c86 (MD5) WaltersIanV2016.pdf: 1546460 bytes, checksum: cf32491178ea3babf5d20039a9143f03 (MD5)
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