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http://dx.doi.org/10.3795/KSME-B.2008.32.6.413

A Heat Release Model of Turbulent Premixed Flame Response to Acoustic Perturbations  

Cho, Ju-Hyeong (한국기계연구원)
Baek, Seung-Wook (한국과학기술원 항공우주공학)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.32, no.6, 2008 , pp. 413-420 More about this Journal
Abstract
The unsteady heat release characteristics play a significant role in combustion instabilities observed in low emissions gas turbine combustors. Such combustion instabilities are often caused by coupling mechanisms between unsteady heat release rates and acoustic perturbations. A generalized model of the turbulent flame response to acoustic perturbations is analytically formulated by considering a distributed heat release along a curved mean flame front and using the flame's kinematic model that incorporates the turbulent flame development. The effects of the development of flame speed on the flame transfer functions are examined by calculating the transfer functions with a constant or developing flame speed. The flame transfer function due to velocity fluctuation shows that, when a developing flame speed is used, the transfer function magnitude decreases faster with Strouhal number than the results with a constant flame speed at low Strouhal numbers. The flame transfer function due to mixture ratio fluctuation, however, exhibits the opposite results: the transfer function magnitude with a developing flame speed increases faster than that with a constant flame speed at low Strouhal numbers. Oscillatory behaviors of both transfer function magnitudes are shown to be damped when a developing flame speed is used. Both transfer functions also show similar behaviors in the phase characteristics: The phases of both transfer functions with a developing flame speed increase more rapidly than those with a constant flame speed.
Keywords
Heat Release Model; Turbulent Premixed Flame; Combustion Instabilities; Flame Transfer Function;
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