Fuel nozzle, fuel nozzle module having the same, and combustor

A fuel nozzle module comprising:

• a plurality of fuel nozzles;
• and
• a shroud formed to surround the plurality of fuel nozzles,
• wherein each of the plurality of fuel nozzles comprises:
• a fuel flow path through which a fuel flows;
• and
• a plurality of fuel plenums, each of the plurality of fuel plenums comprising a plurality of micro-mixers,
• wherein, for each of the plurality of fuel nozzles, each of the plurality of micro-mixers comprises a mixing flow path through which a mixing fluid of the fuel and a compressed air flows and a fuel supply hole for supplying the fuel to the mixing flow path, and
• wherein, for each of the plurality of fuel nozzles, each of the plurality of micro-mixers extends from a respective upstream end with respective to the compressed air flow to a respective downstream end with respective to the compressed air flow,
• wherein, for each of the plurality of fuel nozzles, the plurality of fuel plenums are formed along the fuel flow path and separated from each other by a space,
• wherein, for each of the plurality of fuel nozzles, a first fuel plenum of the plurality of fuel plenums is upstream of a second fuel plenum of the plurality of fuel plenums, such that all of the mixing fluid discharged from the first fuel plenum passes through the space and is received by the second fuel plenum;
• and
• wherein, for each of the plurality of fuel nozzles, the mixing flow path of each of the plurality of micro-mixers in the first fuel plenum has a first diameter, which is constant from the respective upstream end to the respective downstream end of each of the plurality of micro-mixers in the first fuel plenum, the mixing flow path of each of the plurality of micro-mixers in the second fuel plenum has a second diameter, which is constant from the respective upstream end to the respective downstream end of each of the plurality of micro-mixers in the second fuel plenum, and the second diameter being different from the first diameter,
• wherein, for each of the plurality of fuel nozzles, a total count of the plurality of micro-mixers included in the first fuel plenum is defined to include every micro-mixer in the first fuel plenum and designated as a first number M, a total count of the plurality of micro-mixers in the second fuel plenum is defined to include every micro-mixer in the second fuel plenum and designated as a second number N (M, N being natural numbers), and the second number N is different from the first number M.

A combustor comprising:

• a combustion chamber assembly comprising a combustion chamber in which a mixing fluid is combusted;
• and
• a fuel nozzle module comprising a plurality of fuel nozzles for injecting the mixing fluid into the combustion chamber and a shroud formed to surround the plurality of fuel nozzles,
• wherein each of the plurality of fuel nozzles comprises:
• a fuel flow path through which a fuel flows;
• and
• a plurality of fuel plenums, each of the plurality of fuel plenums comprising a plurality of micro-mixers,
• wherein, for each of the plurality of fuel nozzles, each of the plurality of micro-mixers comprises a mixing flow path through which a mixing fluid of the fuel and a compressed air flows and a fuel supply hole for supplying the fuel to the mixing flow path, and
• wherein, for each of the plurality of fuel nozzles, each of the plurality of micro-mixers extends from a respective upstream end with respective to the compressed air flow to a respective downstream end with respective to the compressed air flow,
• wherein, for each of the plurality of fuel nozzles, the plurality of fuel plenums are formed along the fuel flow path and separated from each other by a space,
• wherein, for each of the plurality of fuel nozzles, a first fuel plenum of the plurality of fuel plenums is upstream of a second fuel plenum of the plurality of fuel plenums, such that all of the mixing fluid discharged from the first fuel plenum passes through the space and is received by the second fuel plenum;
• and
• wherein, for each of the plurality of fuel nozzles, the mixing flow path of each of the plurality of micro-mixers in the first fuel plenum has a first diameter, which is constant from the respective upstream end to the respective downstream end of each of the plurality of micro-mixers in the first fuel plenum, the mixing flow path of each of the plurality of micro-mixers in the second fuel plenum has a second diameter, which is constant from the respective upstream end to the respective downstream end of each of the plurality of micro-mixers in the second fuel plenum, and the second diameter being different from the first diameter,
• wherein, for each of the plurality of fuel nozzles, a total count of the plurality of micro-mixers included in the first fuel plenum is defined to include every micro-mixer in the first fuel plenum and designated as a first number M, total count of the plurality of micro-mixers in the second fuel plenum is defined to include every micro-mixer in the second fuel plenum and designated as a second number N (M, N being natural numbers), and the second number N is different from the first number M.