Integrated afterburner with double oil circuits and truncated central cone structure

Abstract

The invention provides an integrated afterburner with double oil circuits and a truncated central cone structure, so that a fuel oil atomization effect can be effectively improved, the oil-gas mixturedegree is improved, the mixed gas staying time is prolonged, and the combustion efficiency is improved. The fuel oil is divided into two streams so as to enter a main oil circuit fuel oil channel andan auxiliary oil circuit fuel oil channel in a rectifying support plate flame stabilizer; the fuel oil of the main oil circuit is sprayed out through small oil spray holes in the surface of the rectifying support plate flame stabilizer; and the fuel oil of the auxiliary oil circuit absorbs heat in the fuel oil channel and is finally sprayed out through small oil spray holes in the surface of a truncated central cone. Due to the structure design of the truncated central cone, an airflow circulation area is enlarged suddenly, and mixed gas of inner and outer duct parts is entrained to the center area after flowing through the truncated central zone so as to form a strong return flow zone structure and is sufficiently mixed and burned with the fuel oil sprayed by the auxiliary oil circuit inthe zone. Due to the long staying time, an oil-gas atomization effect is good, and the burning efficiency and the stability are improved.

Description

technical field [0001] The invention belongs to the field of gas turbine engines, and in particular relates to an integrated afterburner with double oil passages and a truncated central cone structure. Background technique [0002] For fighter jets, in order to gain altitude and speed advantages, expand the flight envelope, supersonic flight and other operational needs on the battlefield, the engine is required to provide the maximum thrust in a short period of time to meet the needs of take-off, climbing, acceleration, mortar and so on. Require. This requires the engine to increase the thrust in a short period of time and enhance the maneuverability of the aircraft, so the concept of "afterburner" was proposed. The afterburner is an important part of an aero-engine. Although its mass only accounts for about 20% of the total mass of the engine, it can greatly increase the thrust of the engine. The afterburner is installed between the turbine and the tail nozzle, and uses ...

AI Technical Summary

Problems solved by technology

However, since the afterburner uses the gas from the main combustion chamber for fuel injection and reburning, the oxygen content in the gas flow is only about 2 / 3 to 3 / 4 of that of normal air, so its combustion efficiency is low

In addition, since the afterburner mostly uses direct injection nozzles, the fuel is directly injected into the airflow, the atomization effect of the fuel is poor, and the mixing with the airflow is not uniform enough, which further reduces the combustion efficiency

[0003] The working environment of the afterburner is poor, and the gas discharged from the outlet of the turbine has high temperature, low pressure and high velocity, which is not conducive to the ignition and organization of combustion of the gas in the afterburner

Images