Optimal control of a swirl-stabilized spray combustor using system identification approach
Optimal control of a swirl-stabilized spray combustor using system identification approach
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DOI：
10.1080/00102200302360
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发表时间：
2003-01
影响因子：
1.9
通讯作者：
S. Murugappan;Shree Krishna Acharya;D. Allgood;S. Park;A. Annaswamy;A. Ghoniem
中科院分区：
文献类型：
--
作者：
S. Murugappan;Shree Krishna Acharya;D. Allgood;S. Park;A. Annaswamy;A. Ghoniem
针对30 ~ 114 kW的旋流稳定喷雾燃烧室，采用系统辨识（SI）方法设计了最优控制器。用两种不同的喷嘴配置测试了控制器的功效。第一种由双燃料喷嘴组成，其主燃料流用于维持燃烧，而副燃料流用于主动控制。第二种配置使用具有两种不同涡旋空气流的单进料喷嘴。利用基于SI的模型设计了LQG-LTR（linear quadratic Gaussian-loop transfer recovery）控制器，确定主动控制输入，并将主动控制输入用于调节二次燃料流。使用该控制器，将稀燃运行条件下发生的热声振荡降低到背景噪声水平。一个时间延迟控制器也实现了比较的目的。结果表明，LQG-LTR控制器产生了额外的压力降低14分贝相比，在两种配置的时间延迟控制器。这种改进可以归因于LQG-LTR控制器的增加的自由度，其允许在不稳定模式附近的频率范围内对受控燃烧器的增益和相位进行最佳成形。这导致在不稳定频率处的压力振幅的额外减小，同时避免产生次级峰值。
An optimal controller using the system identification (SI) method was developed for a swirl-stabilized spray combustor operating between 30 and 114 kW. The efficacy of the controller was tested with two different nozzle configurations. The first consisted of a dual-feed nozzle whose primary fuel stream was utilized to sustain combustion, while the secondarystreamwasused for active control. The second configuration used a single-feed nozzle with two different swirling air streams. An LQG-LTR (linear quadratic Gaussian-loop transfer recovery) controller was designed using the SI-based model to determine the active control input, which was in turn used to modulate the secondary fuel stream. Using this controller, the thermoacoustic oscillations, which occurred under lean operating conditions, were reduced to the background noise level. A time-delay controller was also implemented for comparison purposes. The results showed that the LQG-LTR controller yielded an additional pressure reduction of 14 dB compared to the time-delay controller in both configurations. This improvement can be attributed to the added degrees of freedom of the LQG-LTR controller that allow an optimal shaping of the gain and phase of the controlled combustor over a range of frequencies in the neighborhood of the unstable mode. This leads to the extra reduction of the pressure amplitude at the unstable frequency while avoiding generation of secondary peaks.