定在波型熱音響機関の強制同期時におけるヒステリシス

抄録

In this report, for the forced synchronization of a standing wave thermoacoustic engine, hysteresis in the synchronous / asynchronous region was investigated by changing the external frequency near the branch point from both inside and outside of the branch. The experiment was performed by using a linear motor to input an external force to the standing wave thermoacoustic engine. In the experiment, the difference between the external frequency of the linear motor and the self-sustained oscillation frequency of the standing wave thermoacoustic engine Δf is used as a change parameter. Δf is changed in two patterns: (a) the external force frequency is increased so that Δf changes from negative to positive direction(Δf⁺), (b) the external force frequency is decreased so that Δf changes from positive to negative direction(Δf⁻). The region of the synchronous / asynchronous according to the way that change the external force frequency was compared. Under the condition of this report, in the region where Δf is positive, the synchronous / asynchronous region were alomost same for regardless of Δf⁻ and Δf⁺. On the other hand, in the region where Δf is negative, the result of the hysteresis in the synchronous / asynchronous region was obtained depending on Δf⁻ and Δf⁺.