Effect of oil⁃gas matching on combustor instability

Li XING; Mingxin ZHENG; Wu LI; Huasheng XU; Yong LIANG; Yinhuai LI; Xiong ZHOU

doi:10.13224/j.cnki.jasp.20210701

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Effect of oil⁃gas matching on combustor instability

Combustion,Heat and Mass Transfer | 更新时间：2025-04-07

- Effect of oil⁃gas matching on combustor instability
- Journal of Aerospace Power Vol. 37, Issue 7, Pages: 1352-1362(2022)
- 作者机构：
  
  中国航空发动机集团有限公司四川燃气涡轮研究院，成都 610500
- 作者简介：
- 基金信息：
- DOI：10.13224/j.cnki.jasp.20210701
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Li XING, Mingxin ZHENG, Wu LI, et al. Effect of oil⁃gas matching on combustor instability[J]. Journal of Aerospace Power, 2022, 37(7): 1352-1362.
DOI：

Li XING, Mingxin ZHENG, Wu LI, 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.

摘要

为抑制全环燃烧室在加温加压条件下的高幅度脉动，研究了燃烧室高幅脉动产生机理和油气匹配对燃烧不稳定的影响，结果表明：实验捕捉到了脉动增大的过程，主频为40 Hz的低频脉动，并产生了倍频，压力脉动引起火焰筒壁温发生了2%的波动，造成了燃烧不稳定；仿真计算发现随着燃烧室进口参数的提高及主油路开启导致的雾化变差会使得压力脉动的频率降低，脉动量升高44%；燃烧室进口压力、温度相对基准工况分别降低15%和30%（工况1）或者提高10%和26%（工况6）时可抑制脉动；增加主油路开始工作附近工况的主油路燃油占比后，脉动量总体有较大的减小；抑制脉动的最佳主副油路分配方案为Case3，相对基准方案提高工况2~工况6主油路燃油占比4%时可消除不稳定燃烧；主油路占比在超过一定值，又会使得脉动量升高。

Abstract

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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references

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