Patent ID: 6959551

Claim:
An injection system for a turbomachine combustion chamber, the system comprising: a fuel injection nozzle for vaporizing fuel in the combustion chamber; and a mixer/deflector assembly disposed coaxially with said injection nozzle and serving to mix fuel and oxidizer and to diffuse the mixture in said combustion chamber, said mixer/deflector assembly comprising a first spinner device, or primary swirler, and at least one second spinner device, or secondary swirler, disposed coaxially at a determined distance from the first spinner device and separated by a Venturi device disposed coaxially with said injection nozzle and fixed securely to said first spinner device, wherein said first spinner device is fixed securely to said injection nozzle and is spaced apart therefrom by a constant radial distance, and an upstream portion of an inside surface of the Venturi device has a slope discontinuity comprising a step that is concave.