초록 ▼

A pre-mixing injection system to feed a fuel/air mixture to a combustion zone in a turbojet engine combustion chamber is disclosed having a pre-mixing tube defining a convergent pre-mixing zone and a diverging intermediate zone between the fuel and air injection devices, and the combustion zone of t

A pre-mixing injection system to feed a fuel/air mixture to a combustion zone in a turbojet engine combustion chamber is disclosed having a pre-mixing tube defining a convergent pre-mixing zone and a diverging intermediate zone between the fuel and air injection devices, and the combustion zone of the combustion chamber. The convergent pre-mixing zone has an inlet adjacent to the fuel injector and air swirlers to accept the fuel/air mixture into the pre-mixing tube. The pre-mixing zone converges in a direction from the inlet to an outlet which is in communication with the inlet of the divergent intermediate zone. The divergent intermediate zone has an outlet which is, in turn, in communication with the combustion zone of the turbojet engine combustion chamber. The divergent intermediate zone is defined by an inner wall and an outer wall spaced from the inner wall so as to define a generally frusto-conical chamber between them. The outer wall has a plurality of cooling holes to enable cooling air to pass through the outer wall into cooling contact with the inner wall. The frusto-conical chamber has a downstream evacuation passage to allow cooling air to pass from the frusto-conical chamber.

대표청구항 ▼

A pre-mixing injection system to feed a fuel/air mixture to a combustion chamber of a turbojet engine the combustion chamber having a front end, the premixing injection system, comprising: a) a pre-mixing tube in front of the front end of the combustion chamber comprising: i) a convergent premixing

A pre-mixing injection system to feed a fuel/air mixture to a combustion chamber of a turbojet engine the combustion chamber having a front end, the premixing injection system, comprising: a) a pre-mixing tube in front of the front end of the combustion chamber comprising: i) a convergent premixing zone having an inlet and an outlet, the premixing zone converging in a direction from the inlet towards the outlet; ii) an intermediate zone having an inlet in communication with the outlet of the premixing zone and an outlet in communication with the front end of the combustion chamber, the intermediate zone diverging in a direction from the inlet towards the outlet, the diverging intermediate zone being defined by an inner wall and an outer wall spaced from the inner wall so as to define therebetween a generally frusto-conical chamber, and having a plurality of cooling holes therein to allow cooling air to pass through the outer wall into cooling contact with the inner wall, the frusto-conical chamber having a downstream evacuation passage to allow cooling air to pass from the frusto-conical chamber; and, iii) a plurality of elongated slots in the inner wall to introduce cooling air from the frusto-conical chamber into the intermediate zone wherein the intermediate zone has a central longitudinal axis and wherein the elongated slots are substantially parallel to each other and extend obliquely to the central longitudinal axis; b) a fuel injector to inject fuel into the inlet of the pre-mixing zone; and c) means to introduce air into the inlet of the pre-mixing zone so as to disperse the fuel into droplets.