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http://dx.doi.org/10.6108/KSPE.2016.20.3.078

A Flame Transfer Function with Nonlinear Phase  

Yoon, Myung-Gon (School of Mechanical and Automotive Engineering, Gangneung-Wonju National University)
Kim, Jina (School of Mechanical and Automotive Engineering, Gangneung-Wonju National University)
Kim, Deasik (School of Mechanical and Automotive Engineering, Gangneung-Wonju National University)
Publication Information
Journal of the Korean Society of Propulsion Engineers / v.20, no.3, 2016 , pp. 78-86 More about this Journal
Abstract
In this paper we propose a new frame transfer function model describing the variations of a heat release rate in response to an external flow oscillation in gas turbine systems. A critical difference of our model compared to the so-called $n-{\tau}$ model which has been widely used for a prediction of combustion instability (CI), is that our model is able to describe a nonlinear relation between phase and frequency. In contrast, the phase part of the $n-{\tau}$ model is a pure time delay and thus the phase should be a linear function of frequency, which is inconsistent with many experimental results of real combustion systems. For an illustration, our new model is applied to experimental data and the effect of phase nonlinearity is investigated in the context of combustion instability.
Keywords
Combustion Instability; Flame Transfer Function; Phase delay; Thermoacoustic model;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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