Abstract
A new line-of-sight optical diagnostic technique was developed for measuring species’ concentrations using broadband (band-pass) filtered natural emission of species (FNES). The unresolved problem in measuring a species’ concentration via FNES is the overlap of different species at certain emission wavelengths, which makes the measurement of a single species problematic. A solution is proposed in this work and applied to measure the time-resolved concentrations of water, carbon monoxide and carbon dioxide during autoignition of an n-heptane mixture. The experiments were performed in a rapid compression machine (RCM) at a gas pressure, gas temperature and equivalence ratio of 23.6 bar, 693 K and 0.455, respectively. A high-speed infrared camera with three filters at wavelength ranges of 4.069 to 4.445 μm, 4.545 to 4.785 μm, and 5.2 to 5.4 μm were used to measure the filtered species’ emissions.
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