To permit the exclusion of generation of concentrated low-frequency vibration in a combustor within a wide range by forming eddy current in liquid before or during fuel is mixed into the liquid.

A supplying area for fuel, extended axially with respect to the outlet orifice 5 of a nozzle, is surrounded by a coaxial supplying area 8 for liquid while an eddy current generating member 10 is provided in the supplying area 8. The eddy current generating member 10 provides the flow of liquid with eddy current or whirling operation so as to surround the supplying area 8 for fuel, which is arranged at the center of the generating member 10 and, thereafter, mixes the liquid into the fuel in a mixing chamber 11 provided immediately upstream of the outlet orifice 5 of nozzle. According to this method, the generation of concentrated low-frequency vibration in the combustor can be excluded within a wide range without providing with any re-constructing means in a gas turbine, which is high in the cost thereof.