Numerical Evaluation of Varying Combustion Chamber Length on the Performance of Pulse Detonation Engine Using DES Model

A two-dimensional detached eddy simulation was performed to investigate the behavior of a detonation wavelet in a pulse detonation engine. A chemical kinetic reactive flow of acetylene and oxygen was introduced into the simulation to analyze the reactive flow dynamics of two different models. A comparative study was conducted on the detonation flow dynamics by varying the combustion chamber length. A comprehensive time-transient simulation with computation-intensive iterations was conducted to study the slightest change in the detonation wave characteristics. The results of the simulations suggest that a shorter combustion chamber in Model A provided a sustainable detonation. In comparison, Model B, with a longer combustion chamber, provided a dual detonation wave, which resulted in increased flow frequency of the detonation wave.