A multi-stage fuel injection hole center cone integrated afterburner

Abstract

The invention provides an integrated afterburner with a central cone of multi-stage oil injection holes. The central cone is provided with multi-stage oil injection holes, the central cone is hollow and stepped, and the stepped central cone structure increases The surface area of ​​the high-temperature gas and fuel oil heat exchange in the fuel oil channel forms impact heat exchange at the steps, which strengthens the heat exchange. Due to the multi-stage central cone structure, the high-temperature gas will form an angular vortex between each two-stage sudden expansion when it flows through. A more pronounced recirculation zone is created downstream. The preheated fuel in the center cone fuel passage is sprayed out through the fuel injection holes arranged on the multi-stage center cone, and burns downstream. When fuel is injected from the fuel injection hole, the liquid film will be broken to form secondary atomization, which further improves the atomization effect and the uniformity of oil and gas mixing, thereby improving the combustion efficiency. A recirculation zone is formed in the center of the chamber for stable combustion.

Description

technical field [0001] The invention belongs to the field of gas turbine engines, and in particular relates to a multi-stage fuel injection hole central cone integrated afterburner. Background technique [0002] Certain aero-engines cannot perform well over the entire thrust range. For example, when the aircraft takes off, it needs much more thrust than when cruising. If the engine is designed according to the take-off thrust, the mass of the engine will be too large, and when the engine is in the non-design point state, the performance will be poor; The thrust design of the engine will cause the aircraft to not take off normally. One of the measures to solve the above problems is to add an afterburner between the gas turbine and the nozzle of the engine, which can greatly increase the thrust of the engine in a short period of time. Although the mass of the afterburner is only about 1 / 5 of the engine, the thrust can be increased by more than 60%. At present, the new gener...

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

[0004] 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

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