Abstract
Thermal acoustic oscillations (TAOs) are frequently observed when a tube is inserted into a cryogenic system, particularly when filled with liquid helium. A step temperature profile along the length of the inserted tube has typically been assumed by previous researchers in the development of a theoretical model for such oscillations[3,4]. Such theoretical predictions, however, have shown relatively large errors when compared with the experimental verifications. In this study, thermal acoustic oscillation parameters (including oscillation pressure amplitude and frequency) and temperature profile along the length of the oscillation tube have been measured simultaneously to investigate the effect of temperature profile on the characteristics of TAOs. Relatively steep temperature profiles have been observed. In addition, stability characteristics for thermal acoustic oscillations in a liquid helium system with a continuous temperature profile along the length of the tube have been predicted as well as the oscillation effect of the length ratio between the warm and cold sections of the tube. The latter effect has been observed experimentally to be very sensitive to the stability characteristics of TAOs. Good agreement has been achieved between experimental results and theoretical predictions.
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