초록 ▼

In a gas turbine having a device for the fuel injection, which injects fuel into a mixing device (12), the injected fuel being mixed with combustion air in the mixing device (12), and in which the gas turbine also has a combustion chamber (16) arranged downstream of the mixing device (12), the lengt

In a gas turbine having a device for the fuel injection, which injects fuel into a mixing device (12), the injected fuel being mixed with combustion air in the mixing device (12), and in which the gas turbine also has a combustion chamber (16) arranged downstream of the mixing device (12), the length of the combustion chamber being L.sub.BK and the length of the mixing device being L.sub.Mix, in order to suppress thermoacoustic vibrations the premix combustion chamber (10) containing the combustion chamber (16) and the mixing device (12) is designed in such a way that an acoustic pressure fluctuation which occurs in the premix combustion chamber (10) at the combustion-chamber outlet (20) is superimposed in phase opposition on an entropy-wave-induced pressure fluctuation at a certain frequency to be damped.

대표청구항 ▼

[ What is claimed as new and desired to be secured by Letters Patent of the United States is:] [1.] A premix combustion chamber in a gas turbine having a natural vibration frequency .omega., comprising:a combustion chamber having an inlet at which combustion takes place, and an outlet to a turbine;a

[ What is claimed as new and desired to be secured by Letters Patent of the United States is:] [1.] A premix combustion chamber in a gas turbine having a natural vibration frequency .omega., comprising:a combustion chamber having an inlet at which combustion takes place, and an outlet to a turbine;a mixing device arranged upstream of the combustion chamber and connected to the combustion chamber inlet;a fuel injection device for injecting fuel at a fuel injection location into the mixing device with a fuel injection speed;the combustion generating entropy fluctuations in response to variations of the fuel injection speed;in which premix combustion chamber an acoustic oscillation of frequency .omega. originating at the fuel injection location has a first phase at the combustion chamber outlet, said first phase depending on the length of the mixing device and on the length of the combustion chamber; andin which premix combustion chamber an entropy-fluctuation-induced pressure wave of frequency to has a second phase at the combustion chamber outlet, said second phase depending on the length of the mixing device and on the length of the combustion chamber;wherein at least one of the length of the mixing device and the length of the combustion chamber is selected such that the second phase is in phase opposition to the first phase.