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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 coaxial with the injection nozzle and serving to mix fuel and oxidizer and to diffuse the mixture in the combustion ch

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 coaxial with the injection nozzle and serving to mix fuel and oxidizer and to diffuse the mixture in the combustion chamber, said mixer/deflector assembly comprising a primary swirler and a secondary swirler disposed at a determined distance apart from each other in the axial direction and separated by a Venturi device disposed coaxially with the injection nozzle, the primary swirler being fixed securely to the injection nozzle and being spaced apart therefrom by a constant radial distance which is determined in such a manner that the fuel vaporized by the injection nozzle can under no circumstances impact on the primary swirler. The Venturi device preferably has an inside surface that presents an upstream portion with a slope discontinuity P.

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1. 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 s

1. 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. 2. The injection system according to claim 1, wherein said second spinner device is mounted to slide relative to said injection nozzle via a ring secured to said second spinner device and capable of moving perpendicularly to an axis of symmetry of said injection nozzle in an annular housing of said Venturi device.3. 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 convex. 4. The injection system according to claim 3, wherein said second spinner device is mounted to slide relative to said injection nozzle via a ring secured to said second spinner device and capable of moving perpendicularly to an axis of symmetry of said injection nozzle in an annular housing of said Venturi device.