Measurements of acoustic responses of gaseous propellant injectors

Self-induced instabilities of premixed flames in a multiple injection configuration

“…The combustion chamber acoustics is generally involved in the phenomenon but other processes may participate to its onset, for instance, the mechanism of flame stabilization [7]. On the other hand, the crucial role of the injection manifold has been underlined in previous studies [8][9][10][11]. It has been shown that in an unconfined premixed flame situation, the upstream cavity resonant dynamics can yield spectacular self-induced instability [10,11].…”

Passive control of combustion instabilities involving premixed flames anchored on perforated plates

“…In The objective is to change the stability characteristics of the system by modifying the balance between the gain processes and the losses. The balance may be enhanced by reducing the efficiency of the driving processes or by augmenting damping effects and this can be achieved by a suitable design of the injection manifold, injector geometry, combustion chamber or exhaust section in confined and unconfined situations [4,5].…”

Characteristics of acoustic standing waves in packed‐bed columns

“…Since the transducers were spaced at a distance of 7 cm apart, the exact location of the minima may have not been captured. Hence, to avoid such errors a nonlinear regression technique was used to find the exact location of the minima using the experimental data (Janardhan et al, 1976; Salikuddin and Zinn, 1980). The acoustic pressure was obtained at 26 locations along the packed bed.…”