Characteristic analysis of dynamic pressure signal of unstable combustion in central staged swirl combustor
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摘要:
针对中心分级旋流模型燃烧室中出现的不稳定燃烧特征进行试验研究，在常压试验中同步采集了不同工况下燃烧室动态压力脉动信号、释热率脉动信号和高速火焰图像信号。通过经验模态分解（EMD）对压力脉动信号进行分析，发现脉动特征主要集中在前3阶本征模态（IMF）中。这些IMF通过快速傅里叶变换（FFT）进行主频分析后发现分别与释热率脉动、气流旋流脉动和火焰不稳定脉动特征频谱吻合。进而可以判断通过EMD可以从单一燃烧室压力脉动信号中分解出3个主要物理过程的脉动特征，为进一步分析工程级燃烧室试验中振荡燃烧的诱发机制和燃烧诊断提供了数据处理方法。
Abstract: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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图 3 燃烧室压力脉动随油气比调节的变化
Figure 3. Variation of combustor pressure pulsation with oil-gas ratio regulation
图 4 FI状态和CI状态压力信号频谱结果
Figure 4. Pressure signal spectrum results of FI state and CI state
图 5 A组各工况的0～2 s内DP信号
Figure 5. DP signal within 0—2 s under each working condition of group A
图 8 不同进口空气质量流量下压力脉动峰值变化
Figure 8. Variation of pressure fluctuation peak value under different inlet air mass flows
图 9 A02 压力脉动各个分量的时频域
Figure 9. Time frequency spectrum of each component of A02 pressure pulsation
图 10 DP各阶分量脉动主频变化
Figure 10. Variation of pulsation dominant frequency of DP components
图 11 DP各阶分量脉动峰值能量占比变化
Figure 11. Variation of the proportion of pulsation peak energy of DP components
图 14 冷态DP次主频随进口空气质量流量变化
Figure 14. Variation of secondary dominant frequency of cold DP with inlet mass flow of air
图 15 不同燃烧状态下CH*信号及频谱
Figure 15. CH* signal and spectrum under different combustion conditions
表 2 中心分级燃烧室不稳定燃烧试验工况
Table 2. Unstable combustion test conditions of central staged combustor
试验
编号进口空气质量
流量/（g/s）进气
温度/K进口Re 油气比 A01 100.2 426 40400 0.063 A02 100.2 426 40400 0.057 A03 100.2 426 40400 0.050 A04 100.2 426 40400 0.046 A05 100.2 426 40400 0.038 A06 100.2 426 40400 0.033 B01 130.1 423.4 52000 0.054 B02 130.1 423.4 52000 0.052 B03 130.1 423.4 52000 0.048 B04 130.1 423.4 52000 0.046 B05 130.1 423.4 52000 0.044 B06 130.1 423.4 52000 0.038 C01 140.0 434 56800 0.050 C02 140.0 434 56800 0.048 C03 140.0 434 56800 0.045 C04 140.0 434 56800 0.044 C05 140.0 434 56800 0.040 C06 140.0 434 56800 0.038 
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