Global Patent Index - EP 1255074 A1

EP 1255074 A1 2002-11-06 - Oscillation reduction in a combustion chamber

Title (en)

Oscillation reduction in a combustion chamber

Title (de)

Schwingungsreduktion in einer Brennkammer

Title (fr)

Diminution des oscillations dans une chambre de combustion

Publication

EP 1255074 A1 (DE)

Application

EP 01810429 A

Priority

EP 01810429 A

Abstract (en)

[origin: US2002162336A1] A combustion chamber according to the invention has a number b0 of annularly arranged burners, of which a number k of modulatable burners have means for modulating a fuel mass flow, k being k<b0, and the modulatable burners being arranged in such a way that between every pair of adjacent modulatable burners are arranged in each case a1, a2, . . . ak nonmodulatable burners, and that the values a1+1, a2+1, . . . , ak+1 are not integral divisors of b0. In a preferred embodiment of the invention, a highest value of <paragraph lvl="0"><in-line-formula>LCM(b0, a1+1), LCM(b0, a2+1), . . . LCM(b0, ak+1) </in-line-formula>is maximum, LCM designating the lowest common multiple. It thereby becomes possible to damp a maximum number of azimuthal vibration modes of the combustion chamber by means of a minimum number of modulatable burners. Each pair of modulatable burners gives rise to at least one undesirable vibration or instability which, however, is damped by the other modulatable burner or burners arranged according to the invention.

Abstract (de)

Eine erfindungsgemässe Brennkammer weist eine Anzahl b0 von ringförmig angeordneten Brennern auf, von denen eine Anzahl k von modulierbaren Brennern Mittel zur Modulation eines Brennstoffmassenstroms aufweisen, wobei k<b0 ist und die modulierbaren Brenner derart angeordnet sind, dass zwischen jedem Paar von benachbarten modulierbaren Brennern je a1, a2, ... ak nicht modulierbare Brenner angeordnet sind, und dass die Werte a1+1, a2+1, ..., ak+1 keine ganzzahligen Teiler von b0 sind. In einer bevorzugten Ausführungsform der Erfindung ist ein grösster Wert von kgV(b0, a1+1), kgV(b0, a2+1), ... kgV(b0, ak+1) maximal, wobei kgV das kleinste gemeinsame Vielfache bezeichnet.. Dadurch wird es möglich, mit einer minimalen Anzahl von modulierbaren Brennern eine maximale Anzahl von azimuthalen Schwingungsmodi der Brennkammer zu dämpfen. Jedes Paar von modulierbaren Brennern ruft mindestens eine unerwünschte Schwingung oder Instabilität hervor, die aber durch den oder die erfindungsgemäss angeordneten andern modulierbaren Brenner gedämpft wird. <IMAGE>

IPC 1-7 (main, further and additional classification)

F23D 11/36

IPC 8 full level (invention and additional information)

F23D 11/36 (2006.01)

CPC (invention and additional information)

F23D 11/36 (2013.01); F23D 2210/00 (2013.01)

Citation (search report)

Designated contracting state (EPC)

CH DE LI

EPO simple patent family

EP 1255074 A1 20021106; EP 1255074 B1 20051123; DE 50108163 D1 20051229; US 2002162336 A1 20021107; US 6595002 B2 20030722

INPADOC legal status


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