Electronic Journal Technical Acoustics ISSN 1819-2408

Panagiota Marazioti

An aerothermoacoustic model for computation of the combustion noise (roar) radiated by lifted turbulent jet diffusion flames

language: English

received 10.07.2009, published 09.09.2009

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ABSTRACT

A 2D time-dependent phase-averaged Navier-Stokes flow simulation that encompasses aspects from both the large-eddy simulation (LES) formalism and the conventional k-ε approaches was employed to calculate the reacting jet flows. A reactedness-mixture fraction two-scalar exponential probability density function (PDF) model based on non-premixed flame arguments was combined with a local Damkohler number extinction criterion to separate between reacting and non-reacting regions. Although the inclusion of the effects of premixed flame propagation could help improve the model, initial comparisons with experimental results suggest adequate qualitative agreement between computations and reported data. The reasonable agreement obtained for the aero-thermodynamic flame characteristics permitted the meaningful computation of the combustion noise (roar) characteristics of the lifted flame in an effort to address the coupled effects of heat release by the flame and turbulent interactions on the autonomous flame noise generation.

Key words: combustion roar, lifted flame, sound spectrum, turbulent combustion modeling.

14 pages, 8 figures

Сitation: Panagiota Marazioti. An aerothermoacoustic model for computation of the combustion noise (roar) radiated by lifted turbulent jet diffusion flames. Electronic Journal “Technical Acoustics”, http://www.ejta.org, 2009, 8.

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Panagiota Marazioti did her Master's of Philosophy Degree (MPhil), in “Aerodynamic Noise Prediction in Rotating Machinery” in the School of Mechanical Engineering at Cranfield University (UK). After finishing her PhD in the Department of Mechanical and Aeronautical Engineering, at the University of Patras she started her career in that department. Later on she joined the Department of Energy Technology, in Technological Educational Institute of Athens, Greece as a visitor professor (with convention). She is working on combustion (roar) noise and air pollutants prediction and control (active control…), measurement techniques, data processing and analysis. She has published papers in International journals in this field. e-mail: emaraziot(at)upatras.gr