Journal of Propulsion and Energy ISSN:2734-1887(Print) 2765-0049(Online) Free Open Access International Journal on Propulsion and Energy Science and Technology

We have developed a 1D thermoacoustic network model based on a transfer function approach for predicting combustion instabilities in a multi-duct system. Two different functions are presented for the numerical model. The acoustic transfer function represents the acoustic characteristics and is defined as the ratio of the velocity perturbation to the heat release perturbation. The flame transfer function represents the flame dynamics. The closed-loop feedback instability is analyzed combining these two transfer functions. The numerical approach is successfully validated through comparison of the experimentally obtained instability results in a laboratory scale premixed swirl combustor with well-defined experimental data.