Abstract: A turbine airfoil includes sidewalls extending between leading and trailing edges, with an internal cooling circuit therein. A row of venturi slots commences inside the airfoil at the cooling circuit and terminates near the trailing edge. Each of the venturi slots includes an inlet, converging portion, throat, diverging portion, and outlet in serial flow communication from the cooling circuit. The converging portion is comparable in chordal length with the throat.

Abstract: A turbine nozzle includes outer and inner bands integrally joined to a vane having a three-pass serpentine flow circuit between opposite pressure and suction sidewalls. The outer band includes an inlet for channeling cooling air into a first channel of the circuit located behind a leading edge of the vane. A first outlet is disposed in the inner band at the bottom of the first channel where it joins the second channel of the circuit. A second outlet is also disposed in the inner band at the bottom of a third channel of the circuit which is disposed in flow communication with the second channel. The first channel behind the leading edge is smooth except for corresponding rows of first and second turbulators spaced laterally apart. The first turbulators bridge the pressure and suction sidewalls directly behind the leading edge, and the second turbulators are disposed behind the suction sidewall.

Abstract: A turbine nozzle includes outer and inner bands integrally joined to a vane having a three-pass serpentine flow circuit between opposite pressure and suction sidewalls. The outer band includes an inlet for channeling cooling air into a first channel of the circuit located behind a leading edge of the vane. A first outlet is disposed in the inner band at the bottom of the first channel where it joins the second channel of the circuit. A second outlet is also disposed in the inner band at the bottom of a third channel of the circuit which is disposed in flow communication with the second channel. The first channel behind the leading edge is smooth except for corresponding rows of first and second turbulators spaced laterally apart. The first turbulators bridge the pressure and suction sidewalls directly behind the leading edge, and the second turbulators are disposed behind the suction sidewall.

Abstract: A turbine airfoil includes sidewalls extending between leading and trailing edges, with an internal cooling circuit therein. A row of venturi slots commences inside the airfoil at the cooling circuit and terminates near the trailing edge. Each of the venturi slots includes an inlet, converging portion, throat, diverging portion, and outlet in serial flow communication from the cooling circuit. The converging portion is comparable in chordal length with the throat.