Vibration prediction in combustion chambers by coupling finite elements and large eddy simulations

Huls, R.A. and Sengissen, A.X. and Hoogt van der, P.J.M. and Kok, J.B.W. and Poinsot, T. and Boer de, A. (2007) Vibration prediction in combustion chambers by coupling finite elements and large eddy simulations. Journal of Sound and Vibration, 304 (1-2). pp. 224-229. ISSN 0022-460X

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Abstract:	To decrease NOx emissions from combustion systems, lean premixed combustion is used. A disadvantage is the higher sensitivity to combustion instabilities, leading to increased sound pressure levels in the combustor and resulting in an increased excitation of the surrounding structure: the liner. This causes fatigue, which limits the life time of the combustor. This paper presents a method to calculate these liner vibrations. The time-dependent pressures on the liner are calculated using large eddy simulation (LES) for both steady combustion and combustion with a pulsated fuel flow. These pressures are interpolated on a finite element grid and used in a transient analysis with a finite element model of the liner structure. The calculated vibrations agree well with experiments made on a 500kW test rig.
Item Type:	Article
Copyright:	© 2007 Elsevier
Faculty:	Engineering Technology (CTW)
Research Chair:	Structural Dynamics and Acoustics (SD&A)
Research Group:	Thermal Engineering (TE)
Link to this item:	http://purl.utwente.nl/publications/58783
Official URL:	http://dx.doi.org/10.1016/j.jsv.2007.02.027
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