Dynamical states of thermo-acoustic system with respect to frequency–phase relationship based on probabilistic oscillator model

Ramanan, Vikram; Ramankutty, Anusai; Sreedeep, Sharan; Chakravarthy, Satyanarayanan R.

doi:10.1007/s11071-022-07693-z

Cited by 6 publications

(1 citation statement)

References 40 publications

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“…Rolling contact fatigue (RCF) crack on the top surface of rail is one of the main hidden dangers in the safety of high-speed railway. In order to solve this problem, many researchers have carried out related research work [1][2][3][4][5]. Among them, J. Wilson et al [6] used eddy current pulse thermal imaging (ECPT) technology to detect RCF cracks on the rail surface.…”

Section: Introductionmentioning

confidence: 99%

Research on the optimal detection location of rail RCF crack under fast moving condition

Liu,

2024

Preprint

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in this paper, the influence of shadow effect on the accuracy of crack detection in fast motion is studied. Through the finite element simulation analysis, the change of the magnetic field distribution on the rail surface under the trailing effect is explored, and the intensity and sensitivity of the detection signals at different detection positions are compared. By comparing the results, an optimal detection position with high signal strength and sensitivity is determined, and the best probe structure suitable for fast-moving electromagnetic nondestructive testing is proposed. The results show that the probe structure can effectively characterize the crack with a crack depth of more than 1.0mm when the detection speed reaches 20.0m/s, and the relative error and standard deviation are both less than 10%.

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Section: Introductionmentioning

confidence: 99%

Research on the optimal detection location of rail RCF crack under fast moving condition

Liu,

2024

Preprint

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Low-order modeling of collective dynamics of four ring-coupled turbulent thermoacoustic oscillators

Liao,

Guan,

Liu

et al. 2024

Nonlinear Dyn

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We investigate the low-order modeling of collective dynamics in a can-annular combustor consisting of four ring-coupled turbulent lean-premixed combustors. Each combustor is treated as an individual thermoacoustic oscillator, and the entire combustion system is modeled using four Van der Pol oscillators ring-coupled with dissipative, time-delay, and reactive coupling terms. We show that this model, despite its simplicity, can reproduce many collective dynamics observed in experiments under various combinations of equivalence ratios and combustor lengths, such as 2-can anti-phase synchronization, alternating anti-phase synchronization, pairwise anti-phase synchronization, spinning azimuthal mode, and 4 steady thermoacoustic oscillators. The phase relationship in the majority of cases can be quantitatively modeled. Moreover, by incorporating a reactive coupling term, the model is able to reproduce the frequency shift observed experimentally. This study demonstrates the feasibility of using a simple low-order model to reproduce collective dynamics in complex turbulent combustion systems. This suggests that this model could be used (i) to facilitate the interpretation of experimental data within the synchronization framework, (ii) to identify potential parameter regimes leading to amplitude death, and (iii) to serve as a basis for modeling the collective dynamics observed in more complicated multi-combustors.

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Experimental study of transition in dynamical states of thermo-acoustic oscillations in a turbulent bluff body combustor

Jatoliya,

Singh,

Baraiya

et al. 2024

Nonlinear Dyn

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Dynamical states of thermo-acoustic system with respect to frequency–phase relationship based on probabilistic oscillator model

Cited by 6 publications

References 40 publications

Research on the optimal detection location of rail RCF crack under fast moving condition

Research on the optimal detection location of rail RCF crack under fast moving condition

Low-order modeling of collective dynamics of four ring-coupled turbulent thermoacoustic oscillators

Experimental study of transition in dynamical states of thermo-acoustic oscillations in a turbulent bluff body combustor

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