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Fast Sampling Gas Chromatography (GC) System for Speciation in a Shock Tube

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Stanford University Stanford United States

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We have acquired a gas chromatograph GC to investigate post-shock sampling of shock-heated hydrocarbon fuels. The GC has four analytical columns, which allow for the precise measurement of permanent gases e.g. O2, N2, CO, CO2, CH4, clear separation and therefore ppm-level measurement of C2 and C3 hydrocarbons, and detection of aromatics and hydrocarbons C4 and larger. A sampling system has been implemented on one of our existing shock tube facilities and is used to extract a 14.6-cm3 sample of shock-heated gas, 2 cm from the shock tube end wall. GC analysis of the gas sample yields a measurement of the ultimate mole fraction values of species at the end of the reflected shock test time. Simultaneous in situ optical measurements allow for a comparison of the sampled and optically measured results. Initial experimental results show good agreement between optical measurements and GC analysis results for cold shock experiments, and both techniques capture similar ethylene decomposition rates for temperature-dependent shock experiments.

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Technical Report,01 Aug 2015,31 Jul 2016




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Approved For Public Release;

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