Abstract
Thermal acoustic oscillations (TAOs) were recently observed and eliminated in two vacuum‐housing cryogenic pumps. This paper documents the results of research performed to identify the critical parameters that affect thermal acoustic oscillations in a vacuum‐housing cryogenic pump. Techniques for simplifying this complex oscillation system were developed so that an existing mathematical model for a straight tube with uniform radius could be applied. Based on the simplified model, criteria were defined. These criteria provide design guidelines to prevent thermal acoustic oscillations from occurring inside vacuum‐housing cryogenic pumps.
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