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• W2115794589 abstract "A mesoscale heat recirculating zirconium phosphate combustor was developed and the discontinuous spectra of emission from a propane-air flame inside this combustor were investigated at various flow conditions. Most of the emissions in the discontinuous spectra can be attributed to excited C2, CH and OH radical species. 2-D images of these chemiluminescence emissions were acquired using an intensified CCD camera coupled with the desired narrow band pass interference filters OH* (307nm), CH* (430nm), and C2* (470nm and 515nm). Chemiluminescence images of these emissions provided information on the location of the actual reaction zone boundary. It was observed that the emission strength in all wavelengths increased with increase in flow rate when the equivalence ratio was held constant. For a constant air flow rate the emission from OH* increases with equivalence ratio and reaches a maximum and then decreases. However CH* and C2* emissions showed a continuous increase with equivalence ratio. It was also observed that the reaction zone size as depicted by the OH* chemiluminescence decreases with equivalence ratio when the fuel flow rate is kept constant. For slightly rich condition at higher fuel flow rates, the flame was observed to be particularly loud. OH* chemiluminescence images of this state showed that the reaction zone has shifted to an upstream location of the combustion chamber where the flame experiences instability. However the C2* and CH* images of this state showed emissions from both the upstream location and the combustion chamber. Since mesoscale combustion occurs very close to the wall the black body radiation from the heated wall adulterates the signal obtained in the visible wavelengths. In addition to this there is significant radiation from the soot for rich flame conditions. Hence the images of C2* and CH* showed a rather large flame zone. However the blackbody radiation in the ultraviolet spectrum is negligible. It can be inferred that OH* chemiluminescence is the best suited for diagnostic purposes on a mesoscale flame." @default.
• W2115794589 created "2016-06-24" @default.
• W2115794589 creator A5058340528 @default.
• W2115794589 date "2009-08-02" @default.
• W2115794589 modified "2023-09-25" @default.
• W2115794589 title "Chemiluminescence Study of Propane-Air Flame Inside a Mesoscale Combustor" @default.
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• W2115794589 doi "https://doi.org/10.2514/6.2009-5245" @default.
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