Volume 38 Issue 12
Dec.  2023
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Article Navigation >  Journal of Aerospace Power  > 2023  >  38(12): 2895-2904
QIAO Xingwei, SUN Jiguo, LIU Qian. Prediction of natural acoustic frequency of gas core in centrifugal injector[J]. Journal of Aerospace Power, 2023, 38（12）：2895-2904 doi: 10.13224/j.cnki.jasp.20220054
Citation: QIAO Xingwei, SUN Jiguo, LIU Qian. Prediction of natural acoustic frequency of gas core in centrifugal injector[J]. Journal of Aerospace Power, 2023, 38（12）：2895-2904 doi: 10.13224/j.cnki.jasp.20220054
shu

Prediction of natural acoustic frequency of gas core in centrifugal injector

doi: 10.13224/j.cnki.jasp.20220054
  • 1.

    Beijing Aerospace Propulsion Institute，Beijing 100076，China

  • 2.

    Laboratory of Cryogenic Liquid Propellants， Beijing Aerospace Propulsion Institute，Beijing 100076，China

  • Received Date: 2022-02-07
    Available Online: 2023-08-28
    Abstract

  • In order to obtain accurate natural acoustic frequency of the gas core in centrifugal injector, numerical simulation was carried out by using renormalization group (RNG) $k{\text{-}}\varepsilon$ turbulence model and volume of fluid (VOF) two-phase flow model. The simulation results showed that it could predict acoustic frequency of the centrifugal injector accurately by regarding the injector and conical liquid film at the exit of the injector as an acoustic system, and the modified formula of the acoustic frequency of the centrifugal injector can accurately calculate the first-order and second-order acoustic frequency of different gas media in the gas core, the error was within 3%. The coupling resonance occurred when the chamber pressure disturbance frequency was equal to acoustic frequency of the centrifugal injector, and the increase of the pressure amplitude in gas core was about 16 times of the chamber pressure disturbance amplitude, the gas core acoustic pressure pulsation may be introduced into the upstream supply system, resulting in the instability of the injection.

     

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