Coupling of vibro-acoustic waves with premixed flame

Nonlinear dynamics of premixed flames: from deterministic stages to stochastic influence

“…As can be seen, when V v = 0, the system behaves as an underdamped oscillator (see figure 3 (blue curve)) and the flame experiences strong acceleration effects ( 4g) which are not desirable for an intrinsic flame dynamics analysis. The underlying mechanism for these oscillations is beyond the scope of the present paper and was studied in a recent paper (Radisson, Piketty-Moine & Almarcha 2019). However, to avoid these shortcomings, for all the experiments reported hereafter, a vessel V v = 250 cm 3 is placed between the valve and the burner.…”

A Lattice-Boltzmann study of premixed flames thermo-acoustic instabilities

“…With acoustics the problem is even more challenging for the hybrid LB solver: there is a two-way coupling between acoustics and the shape of the flame, and as the flame propagates, acoustics develops, typically in the middle of the tube. A simpler configuration is to study the forcing of the flame by an imposed acoustic field, usually obtained with a loudspeaker [36], but recently a vibroacoustic coupling has also been used [37,38]. In this paper, we will study both problems: a flame forced by a given acoustic field and the amplification of acoustics during the flame propagation in a 2D narrow channel [39,40].…”

Influence of acoustic oscillations on the speed of a cellular hydrogen-air flame in a horizontal channel

“…One of promising methods to influence combustion parameters is the acoustic influence on the flame region. In [3] analytically, and in [4] experimentally, influence of acoustic gas oscillations on the flame propagation in the vertical direction is shown. In [5] the possibility of stabilizing and increasing the intensity of turbulent combustion of methane-air mixture in the flare with the help of external oscillations is shown.…”