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Laser-Based Alkene Sensors for Shock Tube Kinetics

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Technical Report,01 Jul 2014,31 Dec 2015

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Stanford University Stanford

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We have acquired two laser-based alkene sensors for use in the investigation of fuel kinetics in shock tube experiments. These sensors operate at wavelengths between 10 and 12 microns in the far IR where there are strong absorption bands for a series of alkenes. The two sensors, operated together, can enable the detection of multiple key alkene products, including C2H4 and i-C4H8, that result from pyrolytic decomposition of hydrocarbon fuels. Kinetic analyses predict that alkenes form a large fraction of the decomposition products of jet fuels and jet fuel surrogates, and quantitative measurements using these laser systems have the potential to provide time-histories of the primary alkene decomposition products for such fuels. When employed on our existing shock tube test facilities with other existing laser-based species sensors, a substantially complete picture of the intermediate decomposition products that form during pyrolysis and oxidation should be feasible. These state-of-the-art sensors will also be used in the training and education of the next generation of graduate students in mechanical engineering in the areas of combustion, propulsion, laser diagnostics and shock tube methods.

Subject Categories:

  • Test Facilities, Equipment and Methods
  • Fuels

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