Combustor, gas turbine including the same and method of distributing compressed air in combustor

A combustor comprising:

• a combustion liner constituting a combustion chamber and disposed on an upstream side in a combustion gas flow direction;
• a transition piece constituting the combustion chamber and disposed on a downstream side in the combustion gas flow direction;
• a sleeve surrounding the combustion liner and the transition piece while being spaced apart therefrom;
• a flow passage formed between the combustion liner and the sleeve and between the transition piece and the sleeve;
• a cooling hole formed in the sleeve to introduce compressed air discharged from a compressor into the flow passage;
• and
• a second auxiliary hole formed downstream of the cooling hole in an airflow direction,
• wherein compressed air discharged from the compressor is introduced into the flow passage through the second auxiliary hole, mitigates turbulence generated downstream oh the cooling hole, and maintains momentum of compressed air introduced through the cooling hole.

A gas turbine comprising:

• a compressor configured to compress air;
• a combustor configured to receive compressed air from the compressor, to form a mixture by mixing the compressed air with fuel, and to combust the mixture;
• and
• a turbine configured to be rotated by combustion gas discharged from the combustor to produce power,
• wherein the combustor comprises:
• a combustion liner constituting a combustion chamber and disposed on an upstream side in a combustion gas flow direction;
• a transition piece constituting the combustion chamber and disposed on a downstream side in the combustion gas flow direction;
• a sleeve surrounding the combustion liner and the transition piece while being spaced apart therefrom;
• a flow passage formed between the combustion liner and the sleeve and between the transition piece and the sleeve;
• a cooling hole formed, in the sleeve to introduce compressed air discharged from the compressor into the flow passage;
• and
• a first auxiliary hole formed upstream of the cooling hole in an airflow direction, and
• wherein, compressed air discharged, from the compressor is introduced into the flow passage through the first auxiliary hole, impinges with compressed air flowing through the flow passage, and forms an air column.