PURPOSE: To maintain a film cooling performance without an increase in pressure loss by a method wherein a structural member is provided with an air path which connects the air side to the combustion gas side and also a bypass which directly connects the air side to the combustion gas side, and a lip having an eave-like shape is provided to close the upstream side of the combustion gas.
CONSTITUTION: Cooling air 103 flows from a groove 3 on the air side 101 into an air path 2 inside a structural member 11, then into a groove 4 on the combustion gas side 102 while cooling a combustion device, is transformed into a film cooling air 105 by an eave-like lip 5 and flows out. Bypass cooling air 104 flowing from the air side into a bypass 6 is transformed into a film cooling air 107 by an eave-like lip 9 and flows out, so that it joints with the cooling air 105 and smoothly covers the surface on the combustion gas side. A shortfall in the flow rate of the cooling air 105 is supplied from the bypass 6 so that a specified cooling performance is achieved. Thereby, the cooling performance can be maintained without an increase in pressure loss.
HAYASHI NORIYUKI
ISHIBASHI YOJI
