会议专题

Feedback Control of Combustion Instabilities Using A Helmholtz Resonator with An Oscillating Volume

To suppress combustion instabilities, conventional Helmholtz resonators with fixed cavity volumes have been widely used as acoustic dampers in gas turbine engines. However, such dampers are normally only effective over a narrow frequency range and cannot respond to changes in operating conditions. To broaden the resonators effective frequency range, a multiple input single output control strategy (MISO) is developed to actively oscillate its cavity volume to damp combustion instabilities. This is based on the fact that the frequency at which the resonator provides maximum damping can be tuned by altering its geometry. The MISO strategy consists of two algorithms. One is a real-time plane-wave decomposition algorithm. Another is a least-mean-square algorithm with a variable step-size (LMS-VSS), which uses the decomposed wave to determine the optimum actuation signal. The performance of the tuning strategy, carried out with offline system identification, is evaluated via a numerical model of an unstable combustion system. It is successfully demonstrated that the MISO strategy is capable of stabilizing the combustion system both under varying operating conditions and in the presence of a strong background noise.

combustion instabilities Helmholtz resonators MISO noise-logging technique LMS-VSS

Zhao Dan

Division of Aerospace Engineering, MAE, Nan Yang Technological University, 50 Nanyang Avenue, 639798, Singapore

国际会议

2010 Asia-Pacific International Symposium on Aerospace Technology(2010 亚太航空航天技术研讨会 APISAT 2010)

西安

英文

1151-1155

2010-09-01(万方平台首次上网日期,不代表论文的发表时间)