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AEROSPACE CHINA ›› 2021, Vol. 22 ›› Issue (2): 65-72.doi: 10.3969/j.issn.1671-0940.2021.02.009

• SPECIAL ISSUE • Previous Articles     Next Articles

Numerical Study on the Low-Frequency Pressure Fluctuation Characteristics of Liquid Oxygen Delivery System Based on Acoustic Theory

  

  1. 1 Beijing Institute of Astronautical Systems Engineering, Beijing 100076
    2 Beijing Key Laboratory of Cryogenic Technology Research, Beijing 100076
  • Online:2021-08-10 Published:2021-08-10
  • About author:Chen Erfeng (1980– ), received his Ph.D. degree from the Xi’an Jiaotong University. He is now working at the Beijing Institute of Astronautical Systems Engineering, engaged in the design of pressurization feed system.

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Abstract: Aiming at the low-frequency pressure fluctuation phenomena in certain liquid oxygen delivery systems during dual engine operation, a numerical study on the intrinsic frequency of the liquid oxygen delivery system was conducted by adopting an acoustic unit in Abaqus. Factors such as condensation characteristics of the oxygen-enriched gas gas in the liquid oxygen’s pipeline between pumps, flexibility of the accumulator, and cavitation flexibility of the engine were considered in the simulation models. The simulation results show that the second order frequency of the liquid oxygen delivery system is 8.77 Hz, and the phase difference of the corresponding acoustic modal is 180°, which is the liquid circuit frequency of the small loop between the two branches of the tee. This is consistent with the low-frequency fluctuation phenomenon during flight. Moreover, the simulation results were consistent with the liquid circuit frequency solved via the transfer matrix, which also verified the effectiveness of the frequency analysis method based on acoustic theory.

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