Fluid structure interaction to predict liner vibrations in an industrial combustion system


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Huls, Rob A. and Kampen van, Jaap F. and Kok, Jim B.W. and Boer de, André (2003) Fluid structure interaction to predict liner vibrations in an industrial combustion system. In: Proceedings of the Tenth International Congress on Sound and Vibration. KTH, Stockholm, pp. 767-774. ISBN 9780854327898

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Abstract:To decrease NOx emissions from a combustion system lean premixed combustion in combination with an annular combustor is used. The disadvantage is that sound pressure levels in the combustion system become higher which excite the liner (the surrounding structure). This limits the life of the combustor, because it will fail earlier due to fatigue. This problem is studied in the European project DESIRE (Design and demonstration of highly reliable low NOx combustion systems for gas turbines). A simplified model is studied first. This model consists of a rigid rectangular box which has a flexible plate on one of the sides. Sound is injected into the box using a tube coming from a rectangular box. A loudspeaker generates sound inside this box. A fully coupled finite element model has been made of the structure and the acoustic cavity. The results of the model are compared to the measurements performed on the actual setup. Both the structural mode shapes (measured using a laser vibrometer) and the transfer function from pressure to displacement are used for this purpose. The results match very well.
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Engineering Technology (CTW)
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