Patent ID: 11913409
Assignee: AERO ENGINE ACADEMY OF CHINA
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F  Y | IPC F

Claim 0:
1. An afterburner structure with fuel injection nozzles, which comprises a casing, a central fairing cone located in the casing, a number of airfoil struts connecting the central fairing cone and the inner wall of the casing, the airfoil struts are evenly arranged around the central fairing cone;
the airfoil struts are provided with a number of fuel injection nozzles, and the injection direction of the fuel injection nozzles is perpendicular to the direction of the incoming flow in the engine; each fuel injection nozzle includes a fuel injection nozzle body, an oscillating chamber in the body, a feedback channel connected with the oscillating chamber, and a spout connected with the oscillating chamber and suitable for injecting fuel to the afterburner; the fuel is output in a fan shape through the spout and is dispersed by the incoming flow,
wherein in response to adjacent fuel injection nozzles having the same size,
distances between adjacent fuel injection nozzles satisfy the following relationship:

(Li+d1)2−Li2=(Li+d1+d2)2−(Li+d1)2 

wherein, Li is the distance between a first spout which is close to the central axis of the engine and the central axis of the engine; d1 is the distance between the first spout which is close to the central axis of the engine and an adjacent second spout; d2 is the distance between the second spout and a third spout which is adjacent to the second spout; or
wherein in response to the same distances between adjacent fuel injection nozzles,
equivalent flow areas of fuel between adjacent fuel injection nozzles need to meet:

A1/[(Li+d1)2−Li2]=A2/[(Li+d1+d2)2−(Li+d1)2]

wherein, A1 is the cross-sectional area of an inlet throat of a first nozzle, and A2 is the cross-sectional area of an inlet throat of a second nozzle, Li is the distance between a first spout which is close to the central axis of the engine and the central axis of the engine; d1 is the distance between the first spout which is close to the central axis of the engine and an adjacent second spout; d2 is the distance between the second spout and a third spout which is adjacent to the second spout.