| Citation: | WU Yunhui，FU Chen，GAO Yi，et al.Experiment on nonlinear response of swirling bluff⁃body flame with external acoustic forcing［J］.Journal of Aerospace Power，2022，37（9）：1872‑1885. doi: 10.13224/j.cnki.jasp.20210403
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The experimental measurement of lean premixed swirling bluff‑body dimethyl ether flames excited by an external acoustic forcing at 100 Hz was carried out at atmospheric pressure.With the help of the phase‑locked high‑speed OH* chemiluminescence imaging and particle image velocimetry，the visualization of the flame dynamic characteristic of both the flame shape and the flame flow field with different pulsation amplitudes of the velocity was achieved.Based on these images，the dynamic process of the flame was analyzed by the flame describing function.It was found that the heat release rate first linearly increased as the forcing amplitudes increased，and the nonlinear flame response was recognized when the critical value of the velocity fluctuation ratio was reached.The velocity fluctuation ratio of 16% was the critical value in this experiment.Meanwhile，the difference between linear and nonlinear flame responses was analyzed by means of inverse Abel transformation and proper orthogonal decomposition.The experimental results showed that the vortex roll‑up of the flame shape and the vortex shedding of the flame flow field was enhanced in the nonlinear flame response.From the above analysis，it can be inferred that the enhancement of vortex shedding in the outer recirculation zone of the flame flow field induced the nonlinear flame response.
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