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A double wall venturi chamber having a converging section, a diverging section and a cylindrical section wherein said chamber defines a venturi zone in which compressed air, fuel and combustion products flow downstream through converging section, diverging section and cylindrical section, and has a

A double wall venturi chamber having a converging section, a diverging section and a cylindrical section wherein said chamber defines a venturi zone in which compressed air, fuel and combustion products flow downstream through converging section, diverging section and cylindrical section, and has a cooling gas passage between the walls of the venturi chamber, a least one cooling gas inlet in an outlet wall of the venturi chamber, and at least one cooling gas outlet in an inner wall of the venturi chamber, wherein said cooling gas outlet is in at least one of the diverging and the cylindrical section, and the outlet is downstream of the at least one cooling gas inlet and upstream of an axial end of the chamber.

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What is claimed is: 1. A venturi for a combustor comprising: a double wall venturi chamber having an inner wall defining a converging section, a diverging section and a cylindrical section downstream of the converging and diverging sections, and said interior wall further defining a venturi zone in

What is claimed is: 1. A venturi for a combustor comprising: a double wall venturi chamber having an inner wall defining a converging section, a diverging section and a cylindrical section downstream of the converging and diverging sections, and said interior wall further defining a venturi zone in which compressed air, fuel and combustion products flow downstream through the converging section, diverging section and cylindrical section, wherein the inner wall is devoid of air outlets in the converging section; an outer wall of the double wall venturi chamber; a cooling gas passage between the outer wall and the inner wall of the venturi chamber, including through the converging section, the diverging section and the cylindrical section; a least one cooling gas inlet in the outer wall of the venturi chamber, wherein the cooling gas inlet is proximate at least one of the converging section and the diverging section, an additional cooling gas inlet in the outer wall of the double wall venturi chamber cylindrical section; and at least one cooling gas outlet in the inner wall of the venturi chamber, wherein said cooling gas outlet is in at least one of the diverging and the cylindrical section, and the outlet is downstream of the at least one cooling gas inlet and upstream of an axial end of the venturi chamber, wherein the axial end of the chamber is devoid of a cooling gas outlet. 2. The venturi as in claim 1 wherein said venturi chamber is adapted to be positioned between a primary combustion chamber and a secondary combustion chamber of the combustor and the combustor is a gas turbine combustor. 3. The venturi as in claim 1 wherein said venturi chamber further comprises a throat region between the converging section and the diverging section, and the outer wall proximate to the diverging section is devoid of Cooling gas inlets. 4. The venturi as in claim 1 wherein the venturi chamber is circular in cross section. 5. The venturi as in claim 1 wherein the cooling gas outlet further comprises a plurality of cooling gas outlets arranged circumferentially around the cylindrical section of the inner wall of the venturi chamber. 6. The venturi as in claim 1 wherein the at least one cooling gas outlet projects cooling gas radially inward to the venturi zone. 7. The venturi as in claim 1 wherein the at least one cooling gas outlet comprises a pair of arrays of outlets each arranged circumferentially. 8. The venturi as in claim 1 wherein the outer wherein the outer wall proximate to the diverging section is devoid of cooling gas inlets. 9. The venturi as in claim 1 wherein said at least one cooling gas inlet is an array of inlets arranged circumferentially around the outer wall. 10. A venturi for a combustor comprising: a double wall venturi chamber downstream of fuel injection in the combustor, the chamber having an inner wall defining a converging section, a diverging section and a cylindrical section, wherein the inner wall is devoid of air outlets in the converging section, and wherein said chamber defines a venturi zone in which combustion products flow downstream through converging section, diverging section and cylindrical section; an outer wall of the double wall venturi chamber; a cooling gas passage between the outer wall and the inner wall of the venturi chamber, including through the converging section, the diverging section and the cylindrical section; a cooling gas inlet in the outer wall of the venturi chamber, wherein the cooling gas inlet is proximate the converging section, an additional cooling gas inlet in the outer wall of the double wall venturi chamber cylindrical section; and at least one cooling gas outlet in the inner wall of the venturi chamber and downstream of the cooling gas inlet and upstream of an axial end of the chamber, wherein said cooling gas outlet is in at least one of the diverging and the cylindrical section, and the outlet projects cooling gas radially inward into the venturi zone. 11. The venturi as in claim 10 wherein said venturi chamber is adapted to be positioned between a primary combustion chamber and a secondary combustion chamber of the combustor and the combustor is for a gas turbine. 12. The venturi as in claim 10 wherein said venturi chamber further comprises a throat region between the converging section and a diverging section. 13. The venturi as in claim 10 wherein the venturi chamber is circular in cross section. 14. The venturi as in claim 10 wherein the cooling gas outlet further comprises a plurality of cooling gas outlets arranged circumferentially around the inner wall of the venturi chamber. 15. The venturi as in claim 10 wherein at least one cooling gas outlet comprises a pair of arrays of outlets each arranged circumferentially. 16. The venturi as in claim 10 wherein said cooling gas inlet is in the converging and diverging sections of the outer wall. 17. The venturi as in claim 10 wherein said at least one cooling gas inlet is an array of inlets arranged circumferentially around the outer wall. 18. A method for injecting cooling gas into a combustor having a double wall venturi chamber downstream of fuel injection in the combustor, wherein the chamber has a converging section, a diverging section and a cylindrical section wherein said chamber defines a venturi zone in the combustor, said method comprising: providing cooling gas to an outer wall of the double wall of the venturi chamber such that the cooling gas enters inlets in the outer wall proximate to the converging section of the venturi chamber and an additional inlet proximate the cylindrical section in the outer wall of the double wall of the venturi chamber; defining a cooling passage having a substantially constant width between an inner wall and an outer wall of the double wall of the venturi chamber, wherein the cooling passage extends from the converging section to the diverging section of the venturi chamber and the cylindrical section; cooling the chamber with the cooling gas flowing through the cooling passage between the outer and an inner wall of the venturi chamber, and discharging the cooling gas from the chamber and radially inward into the combustor through an outlet in the inner wall of the venturi chamber, wherein said cooling gas outlet is upstream of an axial end of the chamber. 19. The method of claim 18 wherein said cooling gas is compressed air from an axial compressor of a gas turbine and the compressed air is also directed into the combustor upstream of the converging section. 20. The method of claim 18 wherein the cooling gas outlet further comprises a plurality of cooling gas outlets arranged circumferentially around the inner wall of the venturi chamber, the cooling gas is discharged radially inward from each of the outlets and the outer wall proximate to the diverging section is devoid of cooling gas inlets.