Device for efficient usage of cooling air for acoustic damping of combustion chamber pulsations

Combustion driven pressure pulsations may limit the range of operating conditions where a modern gas turbine can operate with low emission and high efficiency performance. The control of acoustic vibrations has been consequently growing as an essential issue in gas turbine design, development and ma...

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Bibliographische Detailangaben
Hauptverfasser:	HURTER JONAS, PROSS JOERG, BELLUCCI VALTER
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TOTRANSPORTATION COMBUSTION APPARATUS COMBUSTION ENGINES COMBUSTION ENGINES IN GENERAL COMBUSTION PROCESSES GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGHVELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS HEATING HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS INDEXING SCHEME RELATING TO MACHINES OR ENGINES OTHER THANNON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, TO WIND MOTORS,TO NON-POSITIVE DISPLACEMENT PUMPS, AND TO GENERATING COMBUSTIONPRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUSSUBCLASSES OF CLASSES F01-F04 INTERNAL-COMBUSTION PISTON ENGINES LIGHTING MECHANICAL ENGINEERING TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE WEAPONS
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Beschreibung
Zusammenfassung:	Combustion driven pressure pulsations may limit the range of operating conditions where a modern gas turbine can operate with low emission and high efficiency performance. The control of acoustic vibrations has been consequently growing as an essential issue in gas turbine design, development and maintenance. The basic idea of the present invention is to use cooling air leakage through the gaps ( 7 ) of combustor liner segments ( 3;4 ) to get acoustic damping of combustion pulsations. The main component of the design is the sealing device ( 8 ) which covers the gap ( 7 ) between the two liner segments ( 3 ) and ( 4 ). The sealing device ( 8 ) collects in the plenum ( 9 ) some of the cooling air ( 6 ) flowing between the outer casing ( 1 ) and the inner liner structure ( 2 ). For this purpose the sealing device ( 8 ) is provided with openings ( 12 ) along the side walls ( 10 ) which allow the cooling air ( 6 ) to enter the plenum ( 9 ). In the plenum ( 9 ) the cooling air ( 6 ) is distributed along the gap ( 7 ) and discharged through openings ( 13 ), distributed along the top side ( 11 ) of the sealing device ( 8 ). The jets ( 18 ) discharged through the openings ( 13 ) achieve the additional effect to dampen acoustic pulsations in the combustion chamber ( 17 ).