Measurement of acoustic dissipation in an experimental combustor under representative conditions

Mitigating self-excited flame pulsating and thermoacoustic oscillations using perforated liners

“…3c). This means that the measured pressure rms is a reference signal [48][49][50][51]. The cooling flow is an actuator.…”

“…One is associated with a period of 1=245 % 0:0041 s and the other is 1=1:4 % 0:71 s. These periods are fundamentally different. The large-period pulsating oscillations can be attributed to the thermal-diffusive effects, whereas shorter-period combustion-excited oscillations [48][49][50] correspond to acoustic resonances of the Rijke-type combustor. Further study confirms that introducing the acoustic damping/loss [51] to a combustor by implementing the perforated pipe, even in the absence of a cooling flow, can attenuate the thermal-diffusive instability.…”

Monitoring of Thermoacoustic Combustion Instability via Recurrence Quantification Analysis and Optimized Deep Belief Network

“…Thermoacoustic oscillation is a phenomenon that occurs in combustion systems and is characterized by the coupling of heat release rate fluctuations and pressure fluctuations [1,2]. This intricate interaction between combustion and acoustics results in self-sustained, periodic oscillations that can significantly impact the performance and stability of combustion devices, such as gas turbines, engines, and other propulsion systems [3,4]. In thermoacoustic systems, the pressure and temperature fluctuations typically exhibit symmetric behavior in terms of their amplitude and phase.…”