Investigation of unburned/preheated area characteristics of a premixed flame under transverse acoustic excitation based on acetone and CH<sub>2</sub>O PLIF technology

YAN Bo; SUN Yongchao; ZHU Jiajian; WU Ge; WAN Minggang; TIAN Yifu; CHEN Shuang; SUN Mingbo

doi:10.11729/syltlx20210111

Volume 36 Issue 2

May 2022

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Article Navigation > Journal of Experiments in Fluid Mechanics > 2022 > 36(2): 139-145

YAN B，SUN Y C，ZHU J J，et al. Investigation of unburned/preheated area characteristics of a premixed flame under transverse acoustic excitation based on acetone and CH2O PLIF technology[J]. Journal of Experiments in Fluid Mechanics, 2022，36（2）：139-145. doi: 10.11729/syltlx20210111

Citation:

YAN B，SUN Y C，ZHU J J，et al. Investigation of unburned/preheated area characteristics of a premixed flame under transverse acoustic excitation based on acetone and CH₂O PLIF technology[J]. Journal of Experiments in Fluid Mechanics, 2022，36（2）：139-145. doi: 10.11729/syltlx20210111

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Investigation of unburned/preheated area characteristics of a premixed flame under transverse acoustic excitation based on acetone and CH₂O PLIF technology

doi: 10.11729/syltlx20210111

YAN Bo^{1, 2
,},
SUN Yongchao¹,
ZHU Jiajian^{1
,
,},
WU Ge¹,
WAN Minggang¹,
TIAN Yifu¹,
CHEN Shuang²,
SUN Mingbo^{1
,
,}

1.
Science and Technology on Scramjet Laboratory, National University of Defense Technology, Changsha　410073, China
2.
China Aerodynamics Research and Development Center, Mianyang　621000, China

Received Date: 2021-08-31
Accepted Date: 2021-11-17
Rev Recd Date: 2021-11-17

Available Online: 2022-05-26

Publish Date: 2022-05-19

Abstract

Abstract

The thermoacoustic instability is one of the most difficult problems in the development of aerospace propulsion systems. The research on the thermoacoustic instability mechanism of premixed flame can be useful to realize and solve the thermoacoustic oscillation problems of the practical engines. The characteristics of the premixed flame excited by acoustic wave are investigated by the simultaneous acetone/CH₂O planar laser-induced fluorescence（PLIF） technique, and the variation of unburnt zone and preheating zone is acquired. It is shown that the effect of the acoustic wave on the flame is more obvious at lower frequency and higher Sound Pressure Level （SPL）. As the frequency decreases and SPL increases, the change of the flow structure gradually aggravates. It is also found that the morphology of unburned zone/preheating zone changes periodically with the acoustic wave phase. The edge of acetone PLIF images is extracted, and the dependence of the lifting height, diffusion area of the premixed gas on the acoustic wave frequency and the SPL is obtained. The evolution process of the flame morphology under typical acoustic frequency and pressure level is acquired by the simultaneous acetone/CH₂O PLIF images. The phenomenon and mechanism of combustion flameout under typical acoustic condition are analyzed.
- acetone and CH₂O PLIF,
- acoustic excitation,
- premixing combustion,
- mixing charac-ters,
- flame morphology

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References(32)

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