Contents: 2017 | 2016 | 2015 | 2014 | 2013 | 2012 | 2011 | 2010 | 2009 | 2008 | 2007 | 2006 | 2005 | 2004 | 2003 | 2002 | 2001

2009, 8

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

Download article (PDF, 496 kb, ZIP), use browser command "Save Target As..."
To read this document you need Adobe Acrobat © Reader software, which is simple to use and available at no cost. Use version 4.0 or higher. You can download software from Adobe site (http://www.adobe.com/).

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.

REFERENCES

1. Singh, K. K., Frankel, S. H. and Gore, J.P. Effects of combustion on the sound pressure generated by circular jet flows. Journal of American Institute of Aeronautics and Astronautics, 41, 319-321, 2003.
2. Brick, H., Piscoya, R., Ochmann, M. and Koltzsch, P. Modelling of combustion noise with the Boundary Element Method and Equivalent Source Method. Internoise, 2004.
3. Singh, K. K., Frankel, S. H. and Gore, J. P. Study of spectral noise emissions from standard turbulent nonpremixed flames. Journal of American Institute of Aeronautics and Astronautics, 42, 931-936, 2004.
4. P. Boienau, Y. Gerrais and V. Morice. An aerothermoacoustic model for computation of sound radiated by turbulent flames, Internoise, 96, 495-508, 1996.
5. Klein, S. A. On the acoustics of turbulent non-premixed flames, PhD thesis, University of Twente, Enschede, The Netherlands, 2000.
6. Chen, M., Herrmann, M. and Peters, N. Flamelet modeling of lifted turbulent CH4/air and C3H8/air jet diffusion flames. Proc. Comb. Inst., 28, 167, 2000.
7. Schneider, C., Dreizler, A., Janicka, J. and Hassel, E. Flow field measurements of stable and locally extinguishing hydrocarbon-fuelled jet flames. Combustion and Flame 135, 185-190, 2003.
8. Kempf, A., Sadiki, A. and Janicka, J. Prediction of finite chemistry effects using large-eddy simulation. in Proc. Comb. Inst. 29, 2002.
9. P. Koutmos, C. Mavridis and D. Papailiou. Time-dependent computation of turbulent bluff-body diffusion flames close to extinction. International Journal of Numerical Methods for Heat and Fluid Flow, 9, 39-59, 1999.
10. P. Koutmos. Damkohler number description of local extinction in turbulent methane jet diffusion flames. Fuel, 78, 623-626, 1999.
11. Koutmos, P. and Marazioti, P. Identification of local extinction topology in axisymmetric bluff-body diffusion flames with a reactedness-mixture fraction presumed probability density function model. International Journal for Numerical Methods in Fluids, 35, 939-959, 2001.
12. D. Papailiou, P. Koutmos, C. Mavridis and A. Bakrozis. Simulations of local extinction phenomena in bluff-body stabilized diffusion flames with a Lagrangian reactedness model. Combustion Theory and Modeling, 3, 409-431, 1999.
13. Meier, W., Barlow, R., Chen, Y. and Chen, J. Raman/Rayleigh/LIF measurements in a turbulent CH4/H2/N2 jet diffusion flame: Experimental techniques and turbulence-chemistry interaction. Combustion and Flame 123, 326-343, 2000.
14. T. Echekki and J. H. Chen. The effects of complex chemistry on triple flames, NASA CTR manuscript, Proceedings of the Summer School, 217-233, 1996.


 

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