Volume 36 Issue 11
Nov.  2021
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YANG Shangrong, WANG Yong, YANG Baoe. Analysis and prediction of noise-induced combustion instabilities of coaxial swirl injector[J]. Journal of Aerospace Power, 2021, 36(11): 2317-2324. doi: 10.13224/j.cnki.jasp.20200404
Citation: YANG Shangrong, WANG Yong, YANG Baoe. Analysis and prediction of noise-induced combustion instabilities of coaxial swirl injector[J]. Journal of Aerospace Power, 2021, 36(11): 2317-2324. doi: 10.13224/j.cnki.jasp.20200404

Analysis and prediction of noise-induced combustion instabilities of coaxial swirl injector

doi: 10.13224/j.cnki.jasp.20200404
  • Received Date: 2020-09-21
  • Publish Date: 2021-11-28
  • The combustion dynamics of a coaxial swirl injector was investigated with the mixture ratio of oxidant and fuel as the system control parameter.The mixture ratios at which the transitions between combustion noise and oscillatory state occurred were different for the forward path and for the reverse path.This difference indicated that the transition to the oscillatory state observed was subcritical Hopf bifurcation in nature.Noise-induced instabilities were observed in the bistable regime.The viability of three early warning measures such as lag-1 autocorrelation,variance and conditional heteroskedasticity (CH) to predict transition in the combustor was analyzed based on critical slowing down theory.It was found that lag-1 autocorrelation showed an increasing trend as the critical point was approached,enabling to predict catastrophic transitions as early warning signals.Variance may be less generic as an indicator of noise-induced instability.Significant CH showed an increasing trend,which can be used as an auxiliary judgment condition.An online prediction method of good adaptability and reliability for noised-induced instability based on Kendall rank correlation coefficient was proposed.

     

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