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2009, 14

Panagiota Marazioti

Computational fluid dynamics modeling of the combustion noise (roar) in attached-lifted propane jet diffusion flames and comparison of the numerical results

language: English

received 15.09.2009, published 12.11.2009

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ABSTRACT

The autonomous noise generation by the turbulence interactions, heat release and chemistry fluctuation in front of an attached propane jet diffusion flame was investigated numerically. In the computational procedure the Large Eddy simulation turbulent model (LES) 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 used. The preliminary results of the computational fluid dynamics model (CFD) suggest that the location of the maximum noise intensity coincides with the region of the peak temperatures levels. The lifted flame gives elevated energy content in the sound spectrum than the attached one and the difference in the noise level is about 40 dB at most frequencies and mostly near the frequency 80 Hz. The present methodology has been certificated through a series of experimental measurements and a reasonable agreement was observed. It is believed that the present procedure has captured the basic behaviors and trends in the aero-thermochemical and flame noise generation characteristics, of the studied jet diffusion flames, although further tests and improvements would be required to enlarge the applicability of the method.

Key words: combustion roar, attached flame, autonomous noise, sound spectrum, turbulent combustion modeling.

13 pages, 7 figures

Сitation: Panagiota Marazioti. Computational fluid dynamics modeling of the combustion noise (roar) in attached-lifted propane jet diffusion flames and comparison of the numerical results. Electronic Journal “Technical Acoustics”, http://www.ejta.org, 2009, 14.

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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