Numerical study on auto-ignition and combustion characteristics in a supersonic combustor without flame-holder

Li, Xiaojie; Wang, Zihan; Cao, Jun; Shen, Tao; Du, Jianke

doi:10.1016/j.ast.2023.108792

Aerospace Science and Technology

2024

DOI: 10.1016/j.ast.2023.108792

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Numerical study on auto-ignition and combustion characteristics in a supersonic combustor without flame-holder

Xiaojie Li,

Zihan Wang,

Jun Cao

et al.

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On space–time diversity in shock train self-excited oscillation mode during wide-range evolution in a scramjet isolator

Ji,

He,

Huang

et al. 2024

AIP Advances

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The shock train self-excited oscillation can induce combustor instabilities and reduce engine margin. In a dual-mode scramjet, the shock train undergoes a complete evolution process, exhibiting structural changes closely tied to this inherent unsteadiness. This study aims to elucidate the space–time diversity in shock train self-excited oscillation mode and the underlying mechanisms during wide-range evolution. The experimental investigations were conducted at Ma = 1.95, capturing the complete evolution of the shock train. The results indicate the evolution can be categorized into three regimes based on structural characteristics. In regime I, the shock region gradually forms, followed by the occurrence of the mixing region in regime II. Regime III corresponds to inlet unstart. In regime II, isolator outlet pressure fluctuations exhibit higher frequency and lower amplitude compared to regime I, while the shock motion demonstrates lower frequency and higher amplitude. The shock train behaves in a large-scale, low-frequency (1.53 times the duct height, 10 Hz) unsteady motion in regime II, posing a potential threat to engine operation. Coherence and phase analysis reveal the disturbance source originates downstream. Proper orthogonal decomposition modal analysis shows two oscillation modes: low-frequency components correspond to shock motion, and high-frequency components correspond to pressure fluctuations across the entire pseudoshock. The propagating of downstream disturbance differs between the two regimes. In regime I, the shock train exhibits rigid-body motion synchronously. In regime II, the relative motion between each shock wave and the cumulative effect of pressure disturbance lead to frequency decay upstream, amplifying the shock train motion.

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On space–time diversity in shock train self-excited oscillation mode during wide-range evolution in a scramjet isolator

Ji,

He,

Huang

et al. 2024

AIP Advances

View full text Add to dashboard Cite

show abstract

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Numerical study on auto-ignition and combustion characteristics in a supersonic combustor without flame-holder

Cited by 1 publication

References 47 publications

On space–time diversity in shock train self-excited oscillation mode during wide-range evolution in a scramjet isolator

On space–time diversity in shock train self-excited oscillation mode during wide-range evolution in a scramjet isolator

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