Journal
ENERGY
Volume 216, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.energy.2020.119142
Keywords
Non-uniform; Velocity profile; Bluff body; Combustion performance; Fluid-structure; Fuel distribution
Categories
Funding
- National Natural Science Foundation of China of China [51506086]
- National Science and Technology Major Project [2017-Ill-0008-0034]
- China Scholarship Council [201906830096]
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This study reveals that under non-uniform inflow conditions, the velocity peak position and value have a significant impact on combustion performance, leading to asymmetrical flame and temperature distributions.
The quenching problem caused by the inlet distortion of the combustor during emergency attitude adjustment of an aircraft has not been adequately solved by a lack of experimental evidence in nonuniform inflow. Six non-uniform inlet velocity profiles with different velocity peak positions and values were built by perforated plates to explore the combustion performance of a bluff body. The results indicate that the velocity profile with a peak and off-center can produce the asymmetry of the dualvortex structure downstream of the bluff body. The significant phenomenon is that the fluid flows from one vortex to another. More asymmetrical fluid-structure is facilitated by larger peak values or further off-center positions. Then, the asymmetrical flow field leads to non-uniform fuel distribution, which results in an asymmetrical flame and outlet temperature profile. Interestingly, the non-uniformity of outlet temperature increases first and then decreases with the rise of velocity peak position, while it just increases with the growth of the velocity peak value. Compare to uniform inflow, the non-uniform inlet velocity profile will destroy the ignition performance and combustion efficiency in most cases. However, the partial fuel accumulation may occur in the asymmetric fluid structure, which can widen the lean blowout limit. Overall, the flame stability limits and combustion efficiency under the nonuniform inflow in this study are beneficial to the design and application of combustor. (C) 2020 Elsevier Ltd. All rights reserved.
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