| Citation: | XING Li，ZHENG Mingxin，LI Wu，et al.Effect of oil⁃gas matching on combustor instability［J］.Journal of Aerospace Power，2022，37（7）：1352‑1362. doi: 10.13224/j.cnki.jasp.20210701
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To suppress the high⁃amplitude pulsation of the combustor with high temperature and high pressure，the mechanism of high amplitude pulsation in combustor and the effect of oil⁃gas matching on combustion instability were studied.The results showed that the process of increasing pulsation was captured in experiment，dominant frequency was 40 Hz with a low⁃frequency pulsation and it produced a frequency doubling，and the liner temperature fluctuated by 2% due to pressure pulsation，which led to combustion instability.The simulation results showed that with the improvement of combustor inlet parameters and the atomization deterioration caused by the main oil circuit opening，the frequency of pressure pulsation decreased and the pulsation increased by 44%.The pulsation can be suppressed when the inlet pressure and temperature of the combustor was reduced by 15% and 30% （Condition 1） or increased by 10% and 26% （Condition 6） compared with the reference condition.After increasing the fuel proportion of the main oil at the beginning of the main oil working condition，the overall pulsation was greatly reduced；Case3 is the best scheme for primary and secondary oil distribution to suppress pulsation.Compared with the benchmark scheme，unstable combustion can be eliminated when the fuel proportion of main oil in operating conditions 2⁃conditions 6 was increased by 4%.When the proportion of main oil exceeded a certain value，the pulsation increased.
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