| Citation: | XING Jingwen, JIN Jie, WANG Fanget al. Lean blowoff process of bluff body based on heat release rate analysis[J]. Journal of Beijing University of Aeronautics and Astronautics, 2022, 48(3): 473-484. doi: 10.13700/j.bh.1001-5965.2020.0588(in Chinese)
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To understand the complicated blowoff process of premixed turbulence methane-air flame after a conical bluff body, the numerical simulation method based on large eddy simulation (LES) and transport equation probability density function (TPDF) turbulence combustion model was adopted to simulate the flame situations, i.e. far away from blowoff, close to blowoff and blowoff conditions. The flame and the heat release rate (HRR) value under these different conditions were studied, and the criterion for lean blowoff judgement was analyzed quantitatively. The results show that the average relative error between velocity simulation results and experimental results is under 10% in cold situation and under 20% in hot situation. HRR appears in the region where OH and CH2O overlap, and is an important blowoff judgment parameter. When the flame is far away from blowoff conditions, HRR mainly appears at the inner shear layer; when close to blowoff conditions, HRR closes on the flow axis and also appears downstream of the recirculation zone; under blowoff conditions, higher HRR regions spread from downstream to upstream of the recirculation zone. The simulation blowoff predictions are consistent with the experimental PLIF results. In this study, the average HRR can be quantitatively used as a criterion for lean blowoff judgment. At 0.2
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