An evaporating tube combustion chamber

Abstract

The invention provides an evaporating pipe combustion chamber. An inlet and an outlet of an evaporating pipe are each provided with a swirler with a central channel and a swirling flow channel. The swirler at the inlet can speed up breaking, atomizing and evaporating of fuel oil, improve the mixing degree of the fuel oil and air in the evaporating pipe through the initial swirling flow action, andprolong the stay time of an oil-air mixture in the evaporating pipe; the swirler at the outlet enables a low-speed back flowing zone to be formed between the lower portion of the evaporating pipe andthe head of a flame tube through the secondary swirling flow action of the air, and the low-speed back flowing zone is used for improving the flame stability and preventing the condition that the combustion chamber is flamed out in low load. The evaporating pipe combustion chamber is characterized in that the swirling flow action of a swirling flow combustion chamber is applied to the evaporatingpipe combustion chamber, and therefore the double advantages of improving oil-air mixing and improving the combustion stability are achieved. The evaporating pipe combustion chamber can be applied toa micro aircraft engine and a ground gas turbine.

Description

technical field [0001] The invention belongs to the field of aero-engines and gas turbines, and in particular relates to an evaporation tube combustion chamber, which can improve the fragmentation and atomization of fuel oil, promote the mixing of fuel oil and air through two swirling effects, and improve combustion stability and combustion efficiency. Background technique [0002] The evaporating tube structure scheme is widely used in aero-engines and ground gas turbine combustors, especially micro-small power equipment, such as a series of aero-engines such as Turbomeca Arriel in France and AMT in the Netherlands. The combustion chamber adopting the evaporating tube scheme has the advantages of simple structure, easy processing, low cost and good comprehensive combustion performance. It is easy to smoke when it is in a large state, and because there is no special flame stabilizer, the risk of engine flameout is greater when the engine is running below idle or in cruising ...

AI Technical Summary

Problems solved by technology

The above-mentioned schemes improve the mixing effect of fuel and air by increasing the heat exchange area of ​​fuel and air in the evaporator tube, but these measures only enhance the heat exchange of oil and air, but do not change the liquid droplets from large-scale particles to small-scale particles. The crushing speed of particles, so the atomization effect of large-scale particle size droplets is very limited only by enhancing heat transfer

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