Air regulation for film cooling and emission control of combustion gas structure

A gas turbine engine compressed air flow control arrangement, comprising:

• a sleeve configured to separate compressed air in a plenum from a structure configured to guide combustion gas in a straight flow path from a combustor to a first row of turbine blades, wherein the sleeve and combustion gas structure define a volume there between;
• and
• an adjustable flow regulation system configured to adjust a flow volume between the plenum and the volume;
• wherein the combustion gas structure is configured to receive the combustion gas from a can combustor and comprises a plurality of film cooling holes effective to provide symmetric film cooling of a hot surface of the combustion gas structure using a flow of compressed air flowing through the adjustable flow regulation system,
• wherein the adjustable flow regulation system comprises at least a first position wherein the flow volume of compressed air is sufficient to cool the combustion gas structure, and at least a second position that provides a greater flow volume further effective to reduce emissions.

A gas turbine engine compressed air flow control arrangement, comprising:

• a combustion gas structure defining a straight combustion gas flow path, the combustion gas structure and comprising an acceleration geometry configured to receive combustion gas from a can combustor and accelerate the combustion gas to a speed appropriate for delivery onto a first row of turbine blades;
• a sleeve configured to separate compressed air in a plenum from the combustion gas structure, wherein the sleeve and the combustion gas structure define a volume there between;
• and
• a flow path between the plenum and the volume comprising an adjustable flow regulation system configured to adjust the flow volume, wherein the adjustable flow regulation system comprises at least a first position wherein the flow path provides a flow volume of compressed air sufficient to cool the combustion gas structure, and at least a second position that provides a greater flow volume further effective to reduce emissions.