Experimental and numerical study on the characteristics of pressure oscillation waveforms induced by pulsed excitation in T-burner

Traditional studies on T-burners are predominantly based on standing wave theory and lack effective methods for determining waveform patterns within the combustion chamber. In this study, the propagation of pulse waves and pressure oscillation characteristics in a pulsed T-burner were investigated experimentally and numerically. The variation in oscillation waveforms, amplitude-frequency characteristics, attenuation coefficients, and pulse wave propagation velocities were explored parametrically. Additionally, numerical simulations were performed to calculate the waveform states at different stages after pulse excitation, and the standing wave ratio was introduced to quantitatively analyze the waveform transition process. The numerical model was effectively validated through method validation and accumulation of error estimates. The results demonstrate that a transition from traveling waves to standing waves occurs in the combustion chamber after the pulse successfully excites pressure oscillations. The standing wave ratio can effectively quantify the waveform state in the chamber, which provides significant insights into the energy characteristics of pressure oscillations in the T-burner. This study can be applied to optimize data processing procedures for measuring pressure-coupled response functions.