Analysis on combustion instability based on empirical mode decomposition

被引：0
|
作者：
Fu Y. [1 ]
Guo Z.-H. [1 ]
Yang F.-J. [1 ]
Che J.-L. [1 ]
机构：
[1] National Key Laboratory of Science and Technology on Aero-Engines Aero-thermodynamics, School of Energy and Power Engineering, Beijing University of Aeronautics and Astronautics, Beijing
来源：
| 1600年 / Beijing University of Aeronautics and Astronautics (BUAA)卷 / 31期
关键词：
Combustion instability; Empirical mode decomposed (EMD); Hibert-Huang transform; Instantaneous frequency; Intrinsic mode function; Lean-premixed;
D O I：
10.13224/j.cnki.jasp.2016.03.013
中图分类号：
学科分类号：
摘要：
An experimental study was conducted in the lean-premixed swirl-stabilized combustor at atmospheric pressure and temperature in order to analyze the pressure oscillation in occurrence of the combustion instability. The fluctuating pressure signals exhibited as non-stationary signals. A new method using Hilbert-Huang transform (HHT) based on empirical mode decomposition (EMD) and intrinsic mode function (IMF) reconstruction was investigated. This method was applied to demonstrate the characteristics of pressure oscillations in the lean-premixed combustor when the equivalent ratio was at 0.71 and 0.80. The pulsating signals were decomposed with EMD, and IMF containing specific frequencies was obtained. Through the HHT and statistical analysis, the instantaneous frequency of the IMF was analyzed. The results show that the pressure oscillations display the characteristics of intermittent pulsating, and present the beat at the equivalent ratio of 0.71; whereas at the equivalent of ratio 0.80, the pressure oscillations feature the limit cycle. The validity of this method proves that the IMF reflects the inherent mode when the combustion instability occurs, and it has a strong adaptability. © 2016, Editorial Department of Journal of Aerospace Power. All right reserved.
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页码：623 / 630
页数：7
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