Afterburner structure with self-excited sweeping oscillating fuel injection nozzles

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.