The effect of mean pressure on stability limit of the oscillation of thermoacoustic engine with a wet stack

抄録

Measurements and analysis of the critical temperature difference (ΔT_crit) and the oscillation temperature of the hot heat exchanger (T_H) of a wet standing wave thermoacoustic engine under various mean pressure (Pm) are presented. A standing wave thermoacoustic engine with the total length of 675 mm was constructed and operated under the vacuum pressure condition. A wet honeycomb ceramic with size 2/1200 and length 40 mm was used as the stack in this research. Experimental results showed that ΔT_crit and T_H has the tendency to decrease as the mean pressure decreases. The value of T_H did not exceed its boiling point for Pm ≥ 50 kPa. However, when Pm ≤ 40 kPa, the value of T_H exceeded its boiling point. In this research, no oscillation was observed when the mean pressure was equal or below 20 kPa.