کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
521902 867797 2008 25 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
CFD-based application of the Nyquist criterion to thermo-acoustic instabilities
موضوعات مرتبط
مهندسی و علوم پایه مهندسی کامپیوتر نرم افزارهای علوم کامپیوتر
پیش نمایش صفحه اول مقاله
CFD-based application of the Nyquist criterion to thermo-acoustic instabilities
چکیده انگلیسی

A novel approach for the analysis of self-excited instabilities in thermo-acoustic systems is proposed. Combining computational fluid dynamics with low-order acoustic modeling, the open-loop transfer function of the system under investigation is computed. The system eigenmodes and the linear stability characteristics are then deduced from a Nyquist plot.The method is suitable for systems where – due to geometrical complexities or non-compact regions of heat release – a low-order formulation is not appropriate or not available. Explicit knowledge of the frequency response or the transfer matrix of the heat source is not required. Further advantages of the new approach are discussed in the paper.To establish proof of concept, the method is validated against a simple model of a Rijke tube. Over the frequency range considered, frequencies and growth rates of stable as well as unstable eigenmodes are predicted accurately. The new method, combining flow simulation, low-order acoustic modeling and control theory, makes possible a comprehensive analysis of acoustic stability behavior of complex thermo-acoustic systems at comparatively modest computational cost.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Computational Physics - Volume 227, Issue 14, 1 July 2008, Pages 6754–6778
نویسندگان
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