A laboratory-scale 3 kW liquid spray burner was used to explore the dynamic characteristics of liquid spray combustion instability. The dynamic characteristics of sound pressure and flame heat release rate in the combustion chamber under different equivalence ratios were measured, and nonlinear time series analysis methods such as phase space and recurrence plot were used to study the characteristics of thermoacoustic oscillation signal. When the air flow rate of the liquid spray burner gradually increased from 4.0 L/min to 9.5 L/min, the dynamic characteristics of thermoacoustic oscillation in the combustion chamber were different. When the air flow rate was from 4.0 L/min to 5.5 L/min, the sound pressure amplitude of the combustion chamber was between 20 Pa and 30 Pa. However, when the air flow rate was 6.0 L/min, the sound pressure amplitude suddenly increased to 100 Pa. The flame presents turbulent combustion noise, limit cycle, and semi-steady state. At the same time, the increase in air volume (decrease in the equivalence ratio) will trigger thermoacoustic instability, and the turbulent combustion noise of the combustion chamber will abruptly become a limit cycle oscillation.
Fig.1Structure and geometry dimensions of liquid spray combustor
Fig.2Measurement equipment for thermoacoustic instability of liquid spray combustion
Fig.3Changes of sound pressure amplitude under different air volume flow rates
Fig.4Changes of flame chemiluminescence amplitude under different air volume flow rates
Fig.5Fast Fourier analysis of limit cycle thermoacoustic instability under air flow rate of 7.0 L/min
Fig.6Calculation of optimum time lag
Fig.7Calculation of minimum embedding dimension
Fig.8Time series of sound pressure signal under different air volume flow rates
Fig.9Phase space of sound pressure signal under different air volume flow rates
Fig.10Recurrence plot of sound pressure signal under different air volume flow rates
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