Combustion device and gas turbine system

A combustion device, comprising:

• a liner in which a combustion chamber is formed inside a side wall portion;
• a burner that injects fuel into the combustion chamber, the burner provided to the liner;
• an air introduction portion that introduces air into the combustion chamber, the air introduction portion included in the burner or in a vicinity of the burner;
• a separation wall portion provided on a radially outer side of the liner with respect to the side wall portion, the separation wall portion forming an inner flow path communicating with the air introduction portion between the separation wall portion and the side wall portion;
• an outer wall portion provided on a radially outer side of the liner with respect to the separation wall portion, the outer wall portion forming an outer flow path between the outer wall portion and the separation wall portion;
• a plurality of communication holes formed in the separation wall portion in such a manner as to be separated from each other in a central axis direction of the liner, the communication holes allowing the inner flow path and the outer flow path to communicate with each other;
• and a partition wall provided in the inner flow path, the partition wall partitioning the inner flow path in the central axis direction of the liner.