Film cooling structure

Abstract

A film cooling structure 10 includes a structural wall 11 that has an outer surface 12 exposed to combustion gas and an inner surface 13 positioned opposite to the outer surface 12, and film cooling holes 14 are formed at the structural wall 11 and introduce cooling air from the inner surface 13 toward the outer surface 12 in order to perform film cooling. The film cooling hole 14 includes an introducing portion 14 a that extends to a middle position in the structural wall 11 from the inner surface 13 toward the outer surface 12, an enlarged portion 14 b of which the cross-sectional area is gradually increased toward the outer surface 12 from an end of an outer surface side of the introducing portion 14 a and which is opened at the outer surface 12, and a partition portion 16 that partitions the inside of the enlarged portion 14 b into a plurality of spaces in a width direction of the hole perpendicular to a flow direction of the combustion gas.

1 . A film cooling structure, comprising:
 a structural wall that has an outer surface exposed to combustion gas and an inner surface positioned opposite to the outer surface,   wherein film cooling holes being formed at the structural wall and introducing cooling air from the inner surface toward the outer surface in order to perform film cooling of the outer surface,   the film cooling hole includes an introducing portion that extends to a middle position in the structural wall from the inner surface toward the outer surface, an enlarged portion of which the cross-sectional area is gradually increased toward the outer surface from an end of an outer surface side of the introducing portion and which is opened at the outer surface, and a partition portion that partitions the inside of the enlarged portion into a plurality of spaces in a width direction of the hole perpendicular to a flow direction of the combustion gas.   
   
   
       2 . The film cooling structure according to  claim 1 ,
 wherein the partition portion is formed at a middle position of the inside of the film cooling hole in the width direction of the hole perpendicular to the flow direction of the combustion gas,   and the partition portion protrudes from one of the wall surfaces facing upstream and downstream sides in the flow direction of the combustion gas toward the other thereof, and extends over the entire inside of the hole from the inner surface of the structural wall toward the outer surface.