Abstract
A numerical analysis has been performed to investigate the behavior of gas when thermoacoustic self-exited oscillation begins to be generated and to clarify the influence of heat input at a heater at the time of generating self-exited oscillation. The simplest device in which a regenerator is inserted into a tube is applied to the physical model. Transient one-dimensional equations of continuity, momentum and energy are solved utilizing a TVD scheme. It was found that the amount of heat input is related to the initial infinitesimal oscillation, which is considerably important as a disturbance factor for generation of real self-exited oscillation. It was also found that the infinitesimal oscillation is generated by temporally discontinuing heat input.
