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Attenuation effects of perforated plates with heterogeneously distributed holes on combustion instability in a spray flame combustor

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Abstract

Perforated plates have been widely used in combustors to attenuate harmful sounds. In this study, the acoustic absorption capability of plates with heterogeneously distributed holes under bias flow was evaluated in an impedance tube, and the sound attenuation effect of each plate located in the liquid fuel combustor inlet section was experimentally studied. The perforated plate with heterogeneously distributed large holes showed the best control effect under the designed experimental conditions. After control, the peak dynamic pressure in the chamber and plenum decreased by 90 % and 75 %, respectively, and the reduction in the heat release fluctuation was 60 %. When the primary air flow rate deviated from the optimal value, the plate with large holes still reduced the pressure amplitude in the chamber by approximately 70 %. It was also found that installing the perforated plate with a back cavity had the dual effect of gaining and damping combustion instability.

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Abbreviations

a :

Aperture radius

C c :

Contraction ratio

c :

Speed of sound

d :

Hole spacing

f :

Acoustic frequency

He :

Helmholtz number

h :

Plate thickness

j :

Imaginary unit

k :

Wavenumber

K R :

Rayleigh conductivity

I :

Effective orifice length

L :

Cavity length

p :

Acoustic pressure

Q :

Unsteady volume flux

R :

Reflection coefficient

S :

Geometrical swirl number

St :

Strouhal number

St l :

Effective Strouhal number

u c :

Acoustic convection velocity

u p :

Bias flow velocity of an orifice

V A :

Optimal bias volumetric flowrate

α :

Absorption coefficient

ζ :

Specific impedance

ρ :

Air density

σ :

Plate porosity

φ :

Phase of the reflection coefficient

ω :

Angular frequency

′:

Fluctuation value in the time domain

⋀:

Complex value in the frequency domain

PSD:

Power spectral density

SPL:

Sound pressure level

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Acknowledgments

This work was supported by the National Science Fund for Distinguished Young Scholars [No. 51825605] of China.

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Authors and Affiliations

  1. State Key Laboratory of Clean Energy Utilization, Zhejiang University, Zheda Road 38, Hangzhou, 310027, China

    Hao Zhou, Zihua Liu, Hao Fang, Chengfei Tao, Mingxi Zhou & Liubin Hu

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  1. Hao Zhou
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  2. Zihua Liu
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  3. Hao Fang
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  4. Chengfei Tao
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  5. Mingxi Zhou
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Corresponding authors

Correspondence to Hao Zhou or Mingxi Zhou.

Additional information

Hao Zhou is a Prof. at the State Key Laboratory of Clean Energy Utilization, Zhejiang University, China. He received his Ph.D. from Zhejiang University. He is the deputy director of the State Key Laboratory of Clean Energy Utilization. His interests include energy efficient and low pollution utilization, combustion vibration control, solar tower molten salt power generation, advanced energy storage and energy microflow control.

Zihua Liu is a Ph.D. candidate at the State Key Laboratory of Clean Energy Utilization, Zhejiang University, China. He received his B.S. degree from Huazhong University of Science and Technology, China. His research interests include combustion instability modeling and thermoacoustics.

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Zhou, H., Liu, Z., Fang, H. et al. Attenuation effects of perforated plates with heterogeneously distributed holes on combustion instability in a spray flame combustor. J Mech Sci Technol 34, 4865–4875 (2020). https://doi.org/10.1007/s12206-020-1042-2

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  • DOI: https://doi.org/10.1007/s12206-020-1042-2

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