Abstract
Though thermoacoustic engines usually operate at high acoustic amplitude, they rarely exhibit strong deformation of the wavefront due to nonlinear propagation. It has however been demonstrated experimentally that obtaining shock waves in thermoacoustic engines is possible under specific con-ditions. This paper aims at presenting a simple description of the periodic steady-state operation of thermoacoustic engines describing the wave steepening process leading to shock wave formation. Results of numerical simulations are compared to experimental data in different engine configura-tions, and model improvements are proposed to reach a realistic description of the weakly nonlinear propagation in thermoacoustic engines.
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