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.

References

References
1.
Yamamoto
,
T.
,
Shimodaira
,
K.
,
Yoshida
,
S.
, and
Kurosawa
,
Y.
,
2013
, “
Emission Reduction of Fuel-Staged Aircraft Engine Combustor Using an Additional Premixed Fuel Nozzle
,”
ASME J. Eng. Gas Turbines Power
,
135
(
3
), p.
031502
.
2.
Yang
,
V.
,
Wicker
,
J. M.
, and
Yoon
,
M. W.
,
1995
,
Acoustic Waves in Combustion Chambers
(Progress in Astronautics and Aeronautics, Vol.
169
),
American Institute of Aeronautics and Astronautics
,
Reston, VA
, pp.
357
376
.
3.
Yuhui
,
H.
,
2001
, “Numerical Simulation and Experimental Study on Combustion Stability of Liquid Rocket Engine,” Ph.D. thesis, National University of Defense Technology, Changsha, China.
4.
Cohen
,
J. M.
, and
Anderson
,
T. J.
,
1996
, “Experimental Investigation of Near-Blowout Instabilities in a Lean, Premixed Step Combustor,”
AIAA
Paper No. 96-0819.https://arc.aiaa.org/doi/pdf/10.2514/6.1996-819
5.
Hummel
,
T.
,
Berger
,
F.
,
Hertweck
,
M.
,
Schuermans
,
B.
, and
Sattelmayer
,
T.
,
2017
, “
High-Frequency Thermoacoustic Modulation Mechanisms in Swirl-Stabilized Gas Turbine Combustors—Part II: Modeling and Analysis
,”
ASME J. Eng. Gas Turbines Power
,
139
(
7
), p.
071502
.
6.
Lieuwen
,
T.
,
2003
, “
Modeling Premixed Combustion-Acoustic Wave Interactions: A Review
,”
J. Propul. Power
,
19
(
5
), pp.
765
781
.
7.
Han
,
F.
, and
Yue
,
G.
,
1997
, “
Nonlinear Effect of Rijke Thermoacoustic Oscillation
,”
J. Acoust.
,
22
(
3
), pp.
249
254
.
8.
Xuyanying
,
Ming
,
Z.
, and
Fan
,
D.
,
2014
, “
Pressure Characteristics of Helmholtz Type Valveless Self-Excited Pulse Combustor With Curved Tail Tube
,”
J. Power Eng.
,
34
(
11
), pp.
856
861
.
9.
Zhen
,
D.
,
Wang
,
T.
,
Gu
,
F.
,
Tesfa
,
B.
, and
Ball
,
A.
,
2013
, “
Acoustic Measurements for the Combustion Diagnosis of Diesel Engines Fuelled With Biodiesels
,”
Meas. Sci. Technol.
,
24
(
5
), p.
055005
.
10.
Barelli
,
L.
,
Bidini
,
G.
,
Buratti
,
C.
, and
Mariani
,
R.
,
2009
, “
Diagnosis of Internal Combustion Engine Through Vibration and Acoustic Pressure Non-Intrusive Measurements
,”
Appl. Therm. Eng.
,
29
(
8–9
), pp.
1707
1713
.
11.
Carlucci
,
A. P.
,
Chiara
,
F. F.
, and
Laforgia
,
D.
,
2006
, “
Analysis of the Relation Between Injection Parameter Variation and Block Vibration of an Internal Combustion Diesel Engine
,”
J. Sound Vib.
,
295
(
1–2
), pp.
141
164
.
12.
Wang
,
H.
,
2014
, “Large Eddy Simulation of Combustion Instability in Lean Premixed Combustion,” Ph.D. thesis, Dalian University of Technology, Dalian, China.
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