| Citation: | ZHAO Hang, LIU Yong, GE Xinkun, et al. Experimental study on effects of fuel distribution on combustion instability boundary of bluff-body flames[J]. Journal of Aerospace Power, 2025, 40（12）：20240841 doi: 10.13224/j.cnki.jasp.20240841
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In order to study the influence of fuel distribution change on the combustion instability of bluff-body flame under multi-nozzle bluff-body structure in afterburner, the model afterburner was taken as the research object, and the oscillation boundary variation law of bluff-body non-premixed flame instability combustion under different nozzle numbers and inlet velocities was studied. The test results were analyzed by FFT spectrum, kurtosis analysis and deconstruction of flame images. The influence of fuel distribution on the oscillation boundary of the combustion chamber of the bluff body model under different nozzle numbers was studied. The experimental results showed that with the increase of the number of bluff body nozzles, the critical lean equivalent ratio of the system from stable combustion to oscillating state gradually increased, and also increased with the inlet velocity, which was prone to combustion instability. In addition, the pressure fluctuation amplitude and dominant frequency of the oscillation boundary also increased with the increase of the number of nozzles, indicating that the change of the flame structure under the multi-nozzle bluff body mainly caused the change of the oscillation boundary in the model combustion chamber.
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