Chao Tao, Chi Zhang, Qiang An, Xin Xue, Jianting Gao, Xingzhou Fan
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3D distribution of hot spots affected by flow and spray in a centrally staged combustor
This paper investigates the 3D distribution features of fuel, hot spots (HS), and velocity in a centrally staged swirl spray combustor using particle image velocimetry (PIV) and simultaneous fuel/OH planar laser induced fluorescence (PLIF) at an inlet pressure of 0.5 MPa and temperature of 500 K. The pilot and main stages of the combustor were supplied with RP-3 kerosene. Multiple spanwise slices of the combustor were imaged and the resultant data were used to perform 3D reconstruction of the aforementioned physical fields via an interpolation method. Through visualization of the HS in various spanwise and axial slices, as well as more quantitative analysis on the circumferentially averaged radial profiles, HS merging between the main and pilot stages was examined based on the extracted spatial trajectories. Three zones of HS evolution were identified, namely pre-merging, merging, and post-merging. In the pre-merging zone, the hot spots of the two stages exhibited independent growth. As transitioning to the merging zone, the pilot HS was gradually diverted by the pilot air jet and merged to the main HS. In the post-merging zone, the main HS was largely dominated by the unburned fuel jet cores from the main stage. These results show the importance of comprehensive analysis on the 3D characteristics of physical quantities in understanding the HS behavior. This study provides valuable experimental support for regulating HS within the primary combustion zone of centrally staged aero-engine combustors.
期刊介绍:
The Proceedings of the Combustion Institute contains forefront contributions in fundamentals and applications of combustion science. For more than 50 years, the Combustion Institute has served as the peak international society for dissemination of scientific and technical research in the combustion field. In addition to author submissions, the Proceedings of the Combustion Institute includes the Institute''s prestigious invited strategic and topical reviews that represent indispensable resources for emergent research in the field. All papers are subjected to rigorous peer review.
Research papers and invited topical reviews; Reaction Kinetics; Soot, PAH, and other large molecules; Diagnostics; Laminar Flames; Turbulent Flames; Heterogeneous Combustion; Spray and Droplet Combustion; Detonations, Explosions & Supersonic Combustion; Fire Research; Stationary Combustion Systems; IC Engine and Gas Turbine Combustion; New Technology Concepts
The electronic version of Proceedings of the Combustion Institute contains supplemental material such as reaction mechanisms, illustrating movies, and other data.