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International Standard Serial Number:
ISSN 1001-4551
Sponsor:
Zhejiang University;
Zhejiang Machinery and Electrical Group
Edited by:
Editorial of Journal of Mechanical & Electrical Engineering
Chief Editor:
ZHAO Qun
Vice Chief Editor:
TANG ren-zhong,
LUO Xiang-yang
Tel:
86-571-87041360,87239525
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86-571-87239571
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No.9 Gaoguannong,Daxue Road,Hangzhou,China
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Abstract: In order to solve the problems that the vibration behavior caused by gas fluctuations in a gas-wave refrigerator with curved channel was more complex, and the two-dimensional numerical calculation couldn't be simulated and the vibration signal was difficult to collect in the experiment, the dynamic response of the oscillating tube structure with curved channel was studied. Firstly, a three-dimensional unsteady flow model of wave rotor in the double-opening curved channel gas-wave refrigerator was established based on the fluid-structure coupling numerical simulation method, and the reliability of the model was verified. Then, the irregular pressure excitation loads in the oscillating tube were extracted by the Fourier transform method, and the time domain and frequency domain distribution of unsteady fluid excitation loads were analyzed. Finally, the dynamic displacement field and stress field of the oscillating tube under fluctuating pressure were analyzed, and the natural frequency of wave rotor system in the gas-wave refrigerator with curved channel was calculated and compared with that of the straight channel oscillating tube using the same parameters. The experimental results show that the maximum amplitude of the curved channel oscillator tube is increased by 1.74 times than that of the straight channel oscillator tube, but the amplitude is below 10-2mm, which meets the requirement of engineering design. The vibration frequency of the oscillating tube insert is close to the frequency of the fluid-induced force load, but they are all far away from the natural frequency of the wave rotor, which indicates that the structure will not occur resonance and excessive forced vibration, which can meet the needs of safe operation.
Key words: curved channel gas wave refrigerator; wave rotor; fluid-structure coupling numerical simulation method; dynamic response; structural natural frequency; Fourier transform
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