Turbine rotor blade with a nested parallel serpentine flow cooling circuit
First Claim
1. A turbine rotor blade for use in a gas turbine engine, the blade comprising:
- a root portion;
an airfoil portion extending from the root portion;
a blade tip portion;
a leading edge cooling supply channel;
an impingement cavity adjacent to the leading edge of the blade and in fluid communication with the leading edge supply channel by a plurality of impingement holes;
a first triple-pass serpentine flow cooling circuit having a first leg adjacent to the leading edge cooling supply cavity and separated from the supply channel by a continuous rib;
a second triple-pass serpentine flow cooling circuit nested within the first triple-pass serpentine flow cooling circuit, the two nested serpentine flow cooling circuits being separated by a continuous rib extending along the legs of the serpentine flow circuit;
a plurality of cooling slots arranged along the trailing edge of the blade, the slots being in fluid communication with the last leg of the second triple-pass serpentine flow circuit; and
,blade tip cooling holes in fluid communication with the leading edge cooling channel, the first triple-pass serpentine flow circuit, and the last legs of the two nested serpentine flow circuits to provide cooling to the blade tip portion.
4 Assignments
0 Petitions
Accused Products
Abstract
A turbine airfoil used in a gas turbine engine, the airfoil including an internal cooling air circuit that includes two nested and parallel serpentine flow circuits that both flow in the airfoil aft direction. The first and second legs of the two nested serpentine circuits are separated by ribs so that the cooling air flows do not mix. The last leg of the two nested serpentine circuits is separated by a rib which includes a plurality of cross-over holes so that the flows can mix. The aft-most serpentine flow circuit of the two nested circuits includes a last leg that is connected to cooling slots spaced along the trailing edge of the airfoil such that cooling air from the last leg flows out the ducts. The forward-most serpentine circuit of the two nested circuits includes a blade tip channel extending along the blade tip and connecting the first leg with the second leg, the blade tip channel including a plurality of blade tip cooling holes. A leading edge cooling supply channel is connected to at least one impingement cavity by leading edge impingement holes to provide cooling to the leading edge region. The leading edge cooling supply channel is separated from the forward-most serpentine flow circuit by a rib such that the flows do not mix.
54 Citations
13 Claims
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1. A turbine rotor blade for use in a gas turbine engine, the blade comprising:
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a root portion; an airfoil portion extending from the root portion; a blade tip portion; a leading edge cooling supply channel; an impingement cavity adjacent to the leading edge of the blade and in fluid communication with the leading edge supply channel by a plurality of impingement holes; a first triple-pass serpentine flow cooling circuit having a first leg adjacent to the leading edge cooling supply cavity and separated from the supply channel by a continuous rib; a second triple-pass serpentine flow cooling circuit nested within the first triple-pass serpentine flow cooling circuit, the two nested serpentine flow cooling circuits being separated by a continuous rib extending along the legs of the serpentine flow circuit; a plurality of cooling slots arranged along the trailing edge of the blade, the slots being in fluid communication with the last leg of the second triple-pass serpentine flow circuit; and
,blade tip cooling holes in fluid communication with the leading edge cooling channel, the first triple-pass serpentine flow circuit, and the last legs of the two nested serpentine flow circuits to provide cooling to the blade tip portion. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A turbine airfoil used in a gas turbine engine, the airfoil having a leading edge and a trailing edge, the airfoil also having a pressure side and a suction side and an internal cooling air passage to provide cooling for the airfoil, the turbine airfoil comprising:
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two triple-pass serpentine flow cooling circuits nested together and in parallel along substantially the entire airfoil portion; the two nested serpentine flow cooling circuits are separated by substantially radial extending ribs; and
,the rib in the third legs of the two nested serpentine flow circuits include a plurality of cross-over holes to allow for the cooling air from one of the nested circuits to cross over into the other of the two nested circuits. - View Dependent Claims (9, 10, 11, 12, 13)
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Specification