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Study of thermoacoustic oscillations in half-open tubes for saturated superfluid helium
Xianjin Wang,Xiaofei Niu,Feng Bai,Junhui Zhang,Shuping Chen 한국초전도저온학회 2022 한국초전도저온공학회논문지 Vol.24 No.3
Thermoacoustic oscillations (TAOs) are spontaneous pressure oscillations frequently seen in hydrogen or helium cryogenicsystems. Half-open tubes connected to cryogenic fluid with a closed room temperature end have a high potential for oscillationgeneration. Thermoacoustic oscillations will result in significant pressure fluctuations and additional heat load, endangering thesecurity and stability of the cryogenic system. The goal of this paper is to investigate TAOs in superfluid helium using boththeoretical and experimental methods. Five half-open tubes with varied typical inner diameters inserted into superfluid helium wereinstalled in a test cryostat. The onset characteristics of thermoacoustic oscillations were presented and studied. The effect oftemperature profile was discussed. Finally, a simple eliminating method was introduced.