结合系统辨识方法的旋流部分预混燃烧不稳定预测及控制研究

The Prediction and Control of Partially Premixed Swirl Combustion Instability by System Identification Method

本文研究了旋流部分预混火焰的燃烧不稳定性预测以及控制方法。利用计算流体力学方法,结合系统辨识理论得到了火焰传递函数,并通过Helmholtz求解器对系统的燃烧不稳定进行了预测分析。预测的系统振荡频率和实验偏差6%,验证了系统辨识方法用于燃烧不稳定预测的准确性。进一步,结合多孔声衬声学阻抗模型,研究了多孔声衬对燃烧不稳定性的抑制效果。结果表明引入多孔声衬后,燃烧器主导模态的增长率由0.24 rad/s降低为-0.13 rad/s,实现了对燃烧不稳定的控制。

This paper has developed the prediction and control methods of combustion instability in a partially premixed swirl burner.The Computational fluid dynamics(CFD)and system identification method was used to obtain the flame transfer function,and the Helmholtz solver was employed to predict and analyze the combustion instability of the system.The deviation of system oscillation frequency between the predicted and experimental results was about 6%,which verifies the accuracy of the system identification method for the combustion instability prediction.Moreover,the predictions of combustion instability control have been also carried out by combining the acoustic impedance model of acoustic liner.It was found that with the acoustic liner installed,the growth rate of the system decreased from 0.24 rad/s to-0.13 rad/s,achieving the control of combustion instability.