Industrial turbine blade with platform cooling
A turbine rotor blade for an industrial gas turbine engine with a platform cooling circuit that flows from the suction side of the platform and around both the leading edge and trailing edge of the platform, and then along the pressure side platform to cover the entire platform surface. The cooling air flows along smaller diameter cooling holes that cover substantially the entire pressure side platform surface and is then discharged out through openings onto the pressure side mate-face.
1. An industrial engine turbine rotor blade comprising:
an airfoil extending from a platform;
the platform having a leading edge side and a trailing edge side and a suction side and a pressure side;
a plurality of leading edge side cooling air supply holes on the suction side of the platform and connected to a dead rim cavity;
a plurality of trailing edge side cooling air supply holes on the suction side of the platform and connected to the dead rim cavity;
the leading edge side cooling air supply holes are each connected to a leading edge suction side cooling hole formed within the platform;
the trailing edge side cooling air supply holes are each connected to a trailing edge suction side cooling hole formed within the platform;
a leading edge side cooling channel extending along substantially an entire length of the leading edge side of the platform;
a trailing edge side cooling channel extending along substantially an entire length of the trailing edge side of the platform;
the leading edge suction side cooling holes open into the leading edge side cooling channel;
the trailing edge suction side cooling holes open into the trailing edge side cooling channel;
a leading edge pressure side cooling channel formed within the platform and connected to the leading edge side cooling channel;
a trailing edge pressure side cooling channel formed within the platform and connected to the trailing edge side cooling channel;
the leading edge pressure side cooling channel and the trailing edge pressure side cooling channel both follow a contour of the pressure side airfoil;
a row of smaller diameter cooling holes formed within the platform and connected to the leading edge pressure side cooling channel and the trailing edge pressure side cooling channel; and
the row of smaller diameter cooling holes open onto a pressure side mate-face of the platform and extend from the leading edge pressure side cooling channel to the trailing edge pressure side cooling channel.
2. The industrial engine turbine rotor blade of claim 1 , and further comprising:
the row of smaller diameter cooling holes is all parallel to one another.
3. The industrial engine turbine rotor blade of claim 1 , and further comprising:
the leading edge side cooling channel and the trailing edge side cooling channel both open onto the pressure side mate-face of the platform with a restricted opening.
4. The industrial engine turbine rotor blade of claim 1 , and further comprising:
trip strips are located within a larger diameter cooling channel formed within the platform at a location of a hot spot on the platform surface in order to enhance an internal heat transfer coefficient.
5. The industrial engine turbine rotor blade of claim 1 , and further comprising:
the leading edge suction side cooling holes and the trailing edge suction side cooling holes and the leading edge pressure side cooling channel and the trailing edge pressure side cooling channel and the row of smaller diameter cooling holes all together cover substantially the entire platform surface of the blade.
6. The industrial engine turbine rotor blade of claim 1 , and further comprising:
all of the cooling air that flows into the plurality of leading and trailing edge side cooling air supply holes is discharged out through the leading edge pressure side cooling channel and the trailing edge pressure side cooling channel and the row of smaller diameter cooling holes.
7. The industrial engine turbine rotor blade of claim 1 , and further comprising:
trip strips are located in some of the cooling channels where hot spots are found.
8. A process for cooling a platform of an industrial engine turbine rotor blade comprising the steps of:
passing cooling air from a dead rim cavity to a plurality of cooling air feed holes to provide convection cooling to a suction side of the platform;
passing the cooling air along a leading edge cooling channel and a trailing edge cooling channel to provide convection cooling to a leading edge side and a trailing edge side of the platform;
passing cooling air from the leading edge cooling channel through a first row of cooling channels to provide convection cooling to a forward side of the pressure side of the platform;
passing cooling air from the trailing edge cooling channel through a second row of cooling channels to provide convection cooling to an aft side of the pressure side of the platform; and,
discharging the cooling air from the leading edge cooling channel, the trailing edge cooling channel and the two rows of cooling channels on the pressure side of the platform along a pressure side mate face to form a seal.