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Research Papers: Gas Turbines: Combustion, Fuels, and Emissions

Acoustic Diagnostics Applications in the Study of the Oscillation Combustion in Lean Premixed Pre-Evaporation Combustor

[+] Author and Article Information
Zilai Zhang

School of Mechanical Engineering,
Shanghai Jiao Tong University,
No.800 Dongchuan Road,
Minhang 200240, Shanghai, China
e-mail: zzl722@sjtu.edu.cn

Shusheng Zang

School of Mechanical Engineering,
Shanghai Jiao Tong University,
No.800 Dongchuan Road,
Minhang 200240, Shanghai, China
e-mail: sszang@sjtu.edu.cn

Bing Ge

School of Mechanical Engineering,
Shanghai Jiao Tong University,
No.800 Dongchuan Road,
Minhang 200240, Shanghai, China
e-mail: gebing@sjtu.edu.cn

Peifeng Sun

School of Mechanical Engineering,
Shanghai Jiao Tong University,
No.800 Dongchuan Road,
Minhang 200240, Shanghai, China
e-mail: sunpf2013@sjtu.edu.cn

1Corresponding author.

Contributed by the Combustion and Fuels Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received December 6, 2017; final manuscript received February 1, 2018; published online November 28, 2018. Editor: David Wisler.

J. Eng. Gas Turbines Power 140(12), 121508 (Nov 28, 2018) (7 pages) Paper No: GTP-17-1651; doi: 10.1115/1.4039463 History: Received December 06, 2017; Revised February 01, 2018

The paper presents an experimental investigation of the thermoacoustic oscillations detection in a lean premixed pre-evaporation (LPP) combustor using acoustic signals. The LPP model combustion chamber oscillation combustion test platform was designed and built; the thermal parameters signal, the acoustic signal, and the dynamic pressure signal were collected under the steady condition and the transition condition, and been analyzed comparatively. The experimental result shows that, at the same inlet air speed, the dominant frequency of the combustion chamber is proportional to the thermal load, while at the same fuel flow, the main frequency of the combustion chamber does not change with the changing of air speed. In addition, the doubling frequency of the acoustic signal is more obvious than the pressure signals, which show that the interference of the acoustic signal is less. In the transition condition, the pulse energy of the acoustic signal is obviously increased after ignition. The dominant frequency energy increases when the working condition begins to change in the stable to oscillation combustion condition. The dominant frequency energy decreases when the working condition begins to change in the oscillation to stable combustion condition. During the flameout condition, the oscillating energy begins to decay from the high frequency region. For the acoustic signal is less disturbed than the pressure signal and it can obtain the same result with the pressure signal in the oscillation condition and the transition condition, acoustic diagnostic is an auxiliary method for combustion oscillation in LPP combustor.

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References

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Figures

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Fig. 1

Lean premixed pre-evaporation oscillation combustion experimental system

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Fig. 2

Effect of QFuel on oscillation combustion: (a) the relationship between the oscillation frequency and QFuel and (b) the relationship between the oscillation amplitude and QFuel

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Fig. 3

Effect of VAir on oscillation combustion: (a) the relationship between the oscillation frequency and VAir and (b) the relationship between the oscillation amplitude and VAir

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Fig. 4

Ignition condition: (a) time history curve of fuel floe and air flow, (b) STFT spectrogram of the combustion chamber acoustic signal, and (c) STFT spectrogram of the combustion chamber pressure signal

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Fig. 5

Stable to oscillation combustion condition: (a) time history curve of fuel floe and air flow, (b) STFT spectrogram of the combustion chamber acoustic signal, and (c) STFT spectrogram of the combustion chamber pressure signal

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Fig. 6

Oscillation to stable combustion condition: (a) time history curve of fuel floe and air flow, (b) STFT spectrogram of the combustion chamber acoustic signal, and (c) STFT spectrogram of the combustion chamber pressure signal

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Fig. 7

Flameout condition: (a) time history curve of fuel floe and air flow, (b) STFT spectrogram of the combustion chamber acoustic signal, and (c) STFT spectrogram of the combustion chamber pressure signal

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Fig. 8

Schematic diagram of acoustic modal analysis

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