Non-linear dynamics in pulse combustor: A review

Abstract

The state of the art of non-linear dynamics applied to pulse combustor theoretically and experimentally is reviewed. Pulse combustors are a class of air-breathing engines in which pulsations in combustion are utilized to improve the performance. As no analytical solution can be obtained for most of the nonlinear systems, the whole set of solutions can be investigated with the help of dynamical system theory. Many studies have been carried out on pulse combustors whose dynamics include limit cycle behaviour, Hopf bifurcation and period-doubling bifurcation. The dynamic signature has also been used for early prediction of extinction.

Open Set Domain Adaptation for Classification of Dynamical States in Nonlinear Fluid Dynamical Systems

“…Tables 29, 28, 30, and 31 illustrates the evaluation metrics for cross-domain experiments 1 to 4. Figures 30,31,32,and 33 shows the confusion matrices for cross-domain experiments 1 to 4.…”

“…In response, both the aeroelastic and thermoacoustic communities have invested considerable efforts in predicting, preventing, and suppressing instabilities in their respective fluid dynamical systems [5], [12]- [14], [18]- [20], [26], [30]. However, in the case of pulse combustors, a type of thermoacoustic system, the intention is to operate with oscillatory combustion [10], [11], [21], [22], [31]. Therefore, the primary focus is on controlling and maintaining oscillatory combustion rather than suppressing it in pulse combustors.…”