Chemiluminesence is one of the most common reacting flow visualization
techniques, in which a narrowband wavelength associated with species
radicals is captured on an image sensor. This technique can provide
key insights into flame physics, particularly when a full 3D field can
be extracted. Tomographic imaging can capture 3D instantaneous
information, but becomes impractical to use when the technique is
extended to larger, heavier high-speed imaging equipment. This has
resulted in many researchers using fiber-based endoscopes (FBE) to
capture multiple views on a single image sensor. However, the
introduction of the fiber bundle and corresponding equipment to image
specific combustion radicals results in a low SNR imaging environment
when captured at high repetition rates. Additionally, when varying
equivalence ratios, the signal can become further diminished because
the combustion radicals signal weakens at fuel rich and fuel lean
conditions. Therefore, this work determines the efficacy of using a
filter-intensified FBE approach to capture the CH* radical of a
hydrocarbon flame under varying equivalence ratio conditions by
comparing the resulting reconstructions to previous quantitative flame
measurements.
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