Patent ID: 8083485

Claim:
A turbine airfoil comprising: a wall portion comprising: a leading edge; a trailing edge; a suction side; a pressure side; an outer diameter end surface; and an inner diameter end surface; a cooling channel for receiving cooling air extending through an interior of the wall portion between the outer diameter end surface and the inner diameter end surface; an impingement rib positioned within the wall portion forward of the cooling channel and between the outer diameter end surface and the inner diameter end surface to define a peanut cavity; a plurality of impingement rib nozzles extending through the impingement rib for receiving cooling air from the cooling channel; a shelf dividing the peanut cavity into an upper chamber and a lower chamber; a plurality of turbulators positioned within the peanut cavity to locally influence the flow of the cooling air, the plurality of turbulators comprising: a first column of trip strips extending along the suction side in the upper and lower chambers, each trip strip beginning at the impingement rib and extending to the leading edge; and a second column of trip strips extending along the pressure side in the upper and lower chambers, each trip strip beginning at the impingement rib and extending to the leading edge; wherein each trip strip in the upper chamber is angled toward the outer diameter end surface and each trip strip in the lower chamber is angled toward the inner diameter end surface; a plurality of gill holes extending through the wall and comprising: a first column of gill holes extending along the suction side adjacent the impingement rib within the upper and lower chambers; and a second column of gill holes extending along the pressure side adjacent the impingement rib within the upper and lower chambers; and a plurality of leading edge cooling holes, including only a single column of cooling holes disposed between the first and second columns of trip strips at a tip of the leading edge, to discharge the cooling air from the peanut cavity to an exterior of the wall.