Rotational flow atomization device achieving fractional combustion

Abstract

The invention belongs to the field of design of aero-engine main combustion chambers, and particularly relates to a rotational flow atomization device achieving fractional combustion. The rotational flow atomization device comprises an outer swirler, a middle swirler, an inner swirler, an inner supporting plate and a nozzle A. One end of a first wall plate of the outer swirler is connected with aflame tube E. The middle swirler comprises a second wall plate and second blades. The middle swirler is embedded in the outer swirler. The second wall plate is connected with first blades. An outer airflow channel B is formed between the second wall plate and the first wall plate. The inner swirler comprises a third wall plate and third blades and is embedded in the middle swirler. The third wallplate is connected with the second blades, and a middle airflow channel C is formed between the third wall plate and the second wall plate. The inner supporting plate is embedded in the inner swirler,the inner supporting plate is connected with the third blades, and an inner airflow channel D is formed between the inner supporting plate and the third wall plate. The nozzle A is embedded in the inner supporting plate and is in clearance fit with the inner supporting plate, main spray openings are formed in the side wall of the nozzle A, and an auxiliary spray opening is formed in the end of the nozzle A.

Description

technical field [0001] The application belongs to the design field of the main combustion chamber of an aero-engine, and in particular relates to a swirl atomization device for staged combustion. Background technique [0002] The swirl atomization device at the head of the flame tube in the main combustion chamber of an aero-engine generally adopts the structural form of a single-stage or multi-stage swirler combined with a centrifugal pressure atomization nozzle. [0003] In the prior art, the swirling atomization device at the head of the flame tube in the main combustion chamber is composed of a fuel nozzle, a main swirler and a secondary swirler, and the nozzle can be a single oil circuit centrifugal pressure atomization nozzle or a double oil circuit centrifugal type Pressure atomizing nozzles. The swirler is used to create a recirculation zone in the flame tube to ensure stable and efficient combustion. The atomization of fuel is mainly achieved by the pressure differ...

AI Technical Summary

Problems solved by technology

The main disadvantages of the existing technical solutions are as follows: when the engine is in a large working condition, the pressure in the main combustion chamber is high, the aerodynamic force is enhanced, and the resistance of the oil droplets in the airflow increases, so that the fuel near the nozzle is relatively concentrated, causing smoke, carbon deposits, Combustion efficiency reduction and other issues; when the engine is in a small working condition, the fuel supply to the main combustion chamber is low, the atomization level of the nozzle is poor, the combustion stability is poor, and it is prone to flameout; it is impossible to achieve good atomization and combustion under all working conditions Oil and gas matching, high exhaust pollution, does not meet the increasingly stringent aero engine exhaust pollution restrictions

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