Method of operating a turbine engine having a fuel mixer assembly

A method of operating a turbine engine having a compressor section, a combustion section, and a turbine section in a serial flow arrangement, the combustion section comprising a fuel mixer assembly, wherein the fuel mixer assembly comprises a mixing tube body defining a mixing channel, and a fuel source fluidly coupled to the mixing channel, the method comprising:

• supplying air to the mixing channel from a first air stream of a pair of air streams passing through a centerbody air passage having a center body inner surface configured to impart a degree of swirl to the first air stream;
• supplying fuel to the mixing channel from a first set of fuel passages at a first axial position when the turbine engine is at low power conditions, wherein the first set of fuel passages is downstream of the first air stream and angled with respect to a tube centerline defined centrally within the mixing tube body;
• supplying fuel to the mixing channel from a second set of fuel passages at a second axial position, upstream of the first axial position, when the turbine engine is at high power conditions;
• mixing the fuel and the air to form a fuel-air mixture;
• and
• providing the fuel-air mixture to a combustion chamber.