| Citation: | WANG Xuhuai, LIU Yong, ZHANG Xiang, et al. Characteristic analysis of dynamic pressure signal of unstable combustion in central staged swirl combustor[J]. Journal of Aerospace Power, 2023, 38（12）：2883-2894 doi: 10.13224/j.cnki.jasp.20220045
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The unsteady combustion characteristics in the central staged swirl model combustor were experimentally studied. The dynamic pressure pulsation signal, heat release rate pulsation signal and high-speed flame image signal of the combustor under different working conditions were synchronously collected in the atmospheric pressure test. The pressure pulsation signal was analyzed by empirical mode decomposition (EMD), finding that the pulsation characteristics were mainly concentrated in the first three intrinsic mode function (IMF). These IMFs were found to be consistent with the characteristic spectra of heat release rate pulsation, airflow swirl pulsation and flame instability pulsation, respectively, after the main frequency analysis by fast Fourier transform (FFT). Furthermore, it can be judged that the pulsation characteristics of three main physical processes can be decomposed from the single pressure pulsation signal of combustor through EMD decomposition, thus providing a data processing method for further analyzing the induction mechanism and combustion diagnosis of oscillatory combustion in engineering combustor test.
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