Combustor with flow guide in double pipe type liner, and gas turbine having same

A gas turbine comprising a compressor to compress air introduced from an outside;

• a combustor to produce combustion gas by combusting a mixture of fuel and the compressed air;
• and a turbine to produce power using the combustion gas,
• wherein the combustor comprises:
• an air channel formed by an inner casing and an outer casing which are spaced apart from each other by a predetermined distance, through which the compressed air is introduced to the combustor;
• and
• a flow guide attached to an inner surface of the outer casing and extending a predetermined length towards the inner casing so as to guide the compressed air flowing through the air channel toward an outer surface of the inner casing, the flow guide including:
• a channel inlet formed so as to face in a direction of the compressed air flowing through the air channel;
• a channel outlet formed on a lower surface of the flow guide facing the inner casing, the lower surface having a curved structure recessed by a predetermined depth towards the outer casing, the curved structure including an upstream end, a downstream end, and a concave surface extending between the upstream and downstream ends and facing the outer surface of the inner casing;
• and
• a guide channel communicating with each of the channel inlet and the channel outlet,
• wherein the curved structure is disposed such that the upstream and downstream ends are arranged in the direction of the compressed air flowing through the air channel and is configured to pass the compressed air along the concave surface, and
• wherein the channel outlet of the flow guide communicates with the concave surface of the curved structure and is configured to generate swirl along the curved structure when compressed air flowing in the guide channel collides with the compressed air passing the curved structure.