The Submerged Nozzle Damping Characteristics in Solid Rocket Motor

Li, Xiaosi; Pang, Kai; Li, Xinyan

doi:10.3390/aerospace10020191

Cited by 5 publications

(2 citation statements)

References 41 publications

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“…Energy conversion from heat to sound is desired in thermoacoustic engines [1][2][3], because there are no or fewer moving parts and non-exotic materials involved. When this occurs in most modern combustion equipment with high energy densities (such as in liquid/solid rocket engines [4][5][6], aero-engines [7][8][9], or land-based gas turbines [10][11][12]), intense thermoacoustic oscillations may occur, which pose a significant risk due to destructive damage [13][14][15]. This may include, structural vibration fatigue, overloaded heating to the combustor walls, and even explosion.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Stochastically Forced Rijke-Type Supercritical Thermoacoustic Systems

Zhang¹,

WANG²,

Li³

et al. 2023

Preprint

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Intense thermoacoustic oscillations may lead to severe deterioration due to the induced intolerable damage to combustors. A better understanding of unstable behaviors is important to prevent or suppress these oscillations. Active thermoacoustic coupling in practical combustors is caused primarily by two approaches: inherent turbulent fluctuations and the flame response to acoustic waves. Turbulent fluctuations are generally characterized by random noise. This paper experimentally expands on previous analytic studies regarding the influence of colored disturbances on the thermoacoustic response near the supercritical bifurcation point. Therein, a laboratory-scale Rijke-type thermoacoustic system is established, and both supercritical and subcritical bifurcations are observed. Then, Ornstein–Uhlenbeck (OU)-type external colored noise is introduced near the supercritical bifurcation point, and the effects of the corresponding correlation time τc and noise intensity D are studied. The experimental results show that these variables of the colored noise significantly influence the dynamics of thermoacoustic oscillations in terms of the most probable amplitude, autocorrelation, and correlation time. A resonance-like behavior is observed as the noise intensity or the autocorrelation time of the colored noise is continuously varied, which means that the coherent resonance occurs in the thermoacoustic system. Finally, when the system is configured closer to the stability boundary, the extent of the coherence motion is intensified in the stochastic system response. Meanwhile, the Signal to Noise Ratios (SNRs) of the colored-noise-induced response are found to become more distinguished, the optimal colored noise intensity decreases, and the optimal autocorrelation time increases. This provides valuable guidance to predict the onset of thermoacoustic instabilities.

show abstract

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Stochastically Forced Rijke-Type Supercritical Thermoacoustic Systems

Zhang¹,

WANG²,

Li³

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…Energy conversion from heat to sound is desired in thermoacoustic engines [1,2], because there are no moving parts or fewer moving parts and non-exotic materials involved. When this occurs in most modern combustion equipment with high energy densities (such as in liquid/solid rocket engines [3,4], aero-engines [5][6][7], or land-based gas turbines [8][9][10]), intense thermoacoustic oscillations may occur, which pose a significant risk due to destructive damage [11][12][13]. This may include structural vibration fatigue, overloaded heating to the combustor walls, and even explosion.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Stochastically Forced Rijke-Type Supercritical Thermoacoustic Systems

Zhang,

Wang,

et al. 2023

Energies

Self Cite

View full text Add to dashboard Cite

Intense thermoacoustic oscillations may lead to severe deterioration due to the induced intolerable damage to combustors. A better understanding of unstable behaviors is important to prevent or suppress these oscillations. Active thermoacoustic coupling in practical combustors is caused primarily by two approaches: inherent turbulent fluctuations and the flame response to acoustic waves. Turbulent fluctuations are generally characterized by random noise. This paper experimentally expands on previous analytic studies regarding the influence of colored disturbances on the thermoacoustic response near the supercritical bifurcation point. Therein, a laboratory-scale Rijke-type thermoacoustic system is established, and both supercritical and subcritical bifurcations are observed. Then, Ornstein–Uhlenbeck (OU)-type external colored noise is introduced near the supercritical bifurcation point, and the effects of the corresponding correlation time τc and noise intensity D are studied. The experimental results show that these variables of the colored noise significantly influence the dynamics of thermoacoustic oscillations in terms of the most probable amplitude and autocorrelation properties. A resonance-like behavior is observed as the noise intensity or the autocorrelation time of the colored noise is continuously varied, which means that the coherent resonance occurs in the thermoacoustic system. Finally, when the system is configured closer to the stability boundary, the extent of the coherence motion is intensified in the stochastic system response. Meanwhile, the signal-to-noise ratios (SNRs) of the colored-noise-induced response are found to become more distinguished, the optimal colored noise intensity decreases, and the optimal autocorrelation time increases. These findings provide valuable guidance to predict the onset of thermoacoustic instabilities.

show abstract