Volume 36 Issue 5
May  2021
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YU Zhijian, YANG Yang. Prediction of Helmholtz dampers on limit cycle of thermoacoustic instabilities[J]. Journal of Aerospace Power, 2021, 36(5): 997-1006. doi: 10.13224/j.cnki.jasp.2021.05.011
Citation: YU Zhijian, YANG Yang. Prediction of Helmholtz dampers on limit cycle of thermoacoustic instabilities[J]. Journal of Aerospace Power, 2021, 36(5): 997-1006. doi: 10.13224/j.cnki.jasp.2021.05.011

Prediction of Helmholtz dampers on limit cycle of thermoacoustic instabilities

doi: 10.13224/j.cnki.jasp.2021.05.011
  • Received Date: 2020-08-13
  • Publish Date: 2021-05-28
  • Whether Helmholtz method can be used to predict the effects of Helmholtz damper on thermoacoustic limit cycle was investigated. Corresponding experimental validations were performed in a Rijke tube. The limit cycle properties of the Rijke tube equipped with a damper were calculated by the Helmholtz equation coupled with nonlinear heat release model, impedance model and damping rate. The impedance model of the damper was validated in an impedance tube. Results showed that the reflection coefficients of dampers could be calculated by the modified impedance model. The impedance increased with the purge mass flow. Without dampers, the relative errors of predicted limit cycle eigen-frequency and velocity amplitude were 3.4% and 7.2% at the heating voltage of 85 V, respectively. With dampers, the calculated maximum relative errors of those were 3.7% and 6.2%, respectively, under low mass flow. This passive control can be enhanced by increasing purge mass flow due to the vortex shedding. It is advisable to install the damper close to the pressure antinodes.

     

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