[논문]CFD Simulation of thermoacoustic oscillations in liquid helium cryogenic system

wang, xianjin; niu, xiaofei; bai, feng; zhang, junhui; chen, shuping

doi:10.9714/psac.2021.23.1.001

CFD Simulation of thermoacoustic oscillations in liquid helium cryogenic system 원문보기

Progress in superconductivity and cryogenics : PSAC, v.23 no.1, 2021년, pp.1 - 6

wang, xianjin (College of Petrochemical Engineering, Lanzhou University of Technology) , niu, xiaofei (Institute of Modern Physics Chinese Academy of Sciences) , bai, feng (Institute of Modern Physics Chinese Academy of Sciences) , zhang, junhui (Institute of Modern Physics Chinese Academy of Sciences) , chen, shuping (College of Petrochemical Engineering, Lanzhou University of Technology)

Abstract ▼ AI-Helper

Thermoacoustic oscillations (TAOs) could be often observed in liquid helium cryogenic system especially in half-open tubes. These tubes have closed warm end (300K) and open cold end (usually 4.4K). This phenomenon significantly induces additional heat load to cryogenic system and other undesirable effects. This work focuses on using computational fluid dynamics (CFD) method to study TAOs in liquid helium. The calculated physical model, numerical scheme and algorithm, and wall boundary conditions were introduced. The simulation results of onset process of thermoacoustic oscillations were presented and analyzed. In addition, other important characteristics including phase relation and frequency were studied. Moreover, comparisons between experiments and the CFD simulations were made, which demonstrated thevalidity of CFD simulation. CFD simulation can give us a better understanding of onset mechanism of TAOs and nonlinear characteristics in liquid helium cryogenic system.

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표/그림 (12)

그림 Fig. 1. Typical Taconis oscillations tube model.
표 TABLE I NUMERICAL CALCULATION CONDITIONS OF CFD SIMULATION.
그림 Fig. 2. Temperature profiles along the tube under different wall boundary conditions.
그림 Fig. 3. Typical pressure oscillations in tubes with oscillation-free profiles though CFD simulation.
그림 Fig. 4. Process of self-excited pressure oscillations of profile 4 in Fig. 2.
그림 Fig. 5. Process of self-excited pressure oscillations of profile 5 in Fig. 2.
그림 Fig.6. The phase relation between pressure and x-component velocity for profile 4 in Fig. 2.
그림 Fig.7. The phase relation between pressure and x-component velocity for profile 5 in Fig. 2.
그림 Fig. 8. Schematic diagram of the test cryostat.
그림 Fig. 9. Comparison of tube temperature profiles between simulation and experiment under good thermal insulation.
그림 Fig. 10. Pressure variation of experimental results for good thermal insulation tube.
그림 Fig. 11. Temperature profile dynamics in tube of Gorbachev's experiment.

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상세보기
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