Suppression of Spontaneous Gas Oscillations by Acoustic Self-Feedback
Suppression of Spontaneous Gas Oscillations by Acoustic Self-Feedback
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DOI：
10.1103/physrevapplied.6.044020
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发表时间：
2016-10-28
影响因子：
4.6
通讯作者：
Kato, Soichiro
中科院分区：
文献类型：
--
作者：
Biwa, Tetsushi;Sawada, Yoshiki;Kato, Soichiro
本文介绍了一种声自反馈方法，以抑制自发气体振荡，如那些观察到的燃气涡轮发动机燃烧室。传统的反馈系统由机电装置组成，而本方法利用连接振荡系统的两个位置的中空管实现声学自反馈。设计并建立了一个燃烧驱动气体振荡的模型振荡器，以证明自反馈概念的适用性。通过测量振荡的Q值（品质因数）的稳定性分析表明，所需的延迟时间和增益时，得到的管长度等于奇数倍的预期的声学振荡的波长的一半。
This paper demonstrates a method of acoustical self-feedback to suppress spontaneous gas oscillations such as those observed in combustors of gas-turbine engines. Whereas a conventional feedback system consists of electromechanical devices, the present method achieves acoustical self-feedback with a hollow tube that connects two positions of the oscillation system. A model oscillator of combustion-driven gas oscillations is designed and built to demonstrate the applicability of the self-feedback concept. Stability analysis through measurements of Q values (quality factor) of oscillations shows that the desired delay time and gain are obtained when the tube length is equal to the odd integer times half the wavelength of the anticipated acoustic oscillations.