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Study of Turbulent Spherical Flames in a Reconfigurable Fan-Stirred Flame Bomb
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Turbulent combustion is a very active and challenging research topic. A spherically expanding flame immersed in a turbulent field is one way to gain fundamental insight on the effect of turbulence in combustion. This kind of experiment is conducted inside a fan-stirred flame bomb, but there is only a handful of these devices around the globe. The list is even shorter if demanding conditions are to be tested, i.e. high pressure, high temperature and intense turbulence. A new fan-stirred flame bomb was designed and built to address this shortage. Existing fan-stirred flame bombs were studied first to learn their salient characteristics. This literature review was then used as guidance in the design of turbulence generation elements. A few options of impellers were explored. The flow field produced by the chosen impeller was measured with Laser Doppler Velocimetry (LDV). A detailed exposition of the vessel engineering ensued. Before turbulent experiments were attempted, a validation of the rig accuracy and worthiness was made. The setup demonstrated excellent repeatability and agreement with benchmarks. Finally, a demonstration of the new apparatus was made by testing a lean mixture of syngas. The experiment matrix using hydrogen and H₂/CO mixtures included three levels of pressure (1, 5, and 10 bar) and three levels of turbulence fluctuation rms (1.4, 2.8, and 5.5 m/s). General trends of the effect of turbulence were in line with expectation, but not enough information was obtained to gain insight on the role of pressure.
optically accessible pressure vessel
spherically expanding flame
Morones Ruelas, Anibal (2018). Study of Turbulent Spherical Flames in a Reconfigurable Fan-Stirred Flame Bomb. Doctoral dissertation, Texas A & M University. Available electronically from
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