Fishbone-like instability in a looped-tube thermoacoustic engine.
Quasi-periodic bursts of acoustic oscillations were observed during the start-up process in a looped-tube thermoacoustic engine. The acoustic oscillations have a constant frequency of 111 Hz, while the bursts have "quasi-periods" in the order of 14-25 s. The quasi-periodic bursts show a new mode of amplitude growth in this thermoacoustic engine. The envelope of the acoustic oscillations has a fishbone-like shape. The nature of the observed fishbone-like instabilities suggests a strong interaction between the acoustic and temperature field.
Zhibin
Z
Yu
Artur J
AJ
Jaworski
Abdulrahman S
AS
Abduljalil
D000162:Acoustics; D004738:Engineering / Q000295:instrumentation*; D004867:Equipment Design; D008962:Models, Theoretical; D009991:Oscillometry; D011312:Pressure; D013016:Sound; D013018:Sound Spectrography; D013696:Temperature; D013997:Time Factors