Preparation method of head for starting wide envelope of combustion chamber of evaporating pipe

Abstract

The invention discloses a preparation method of a head for starting a wide envelope of an evaporation tube combustion chamber, an annular cavity is formed by a flame tube outer ring, a flame tube front end face and a flame tube inner ring, a plurality of inverted L-shaped contraction type evaporation tubes are arranged in the cavity, and each contraction type evaporation tube comprises an evaporation tube contraction type inlet and an evaporation tube contraction type outlet. Flame tube outer ring head air inlet holes and flame tube inner ring head air inlet holes are formed in the flame tube periodic section where the evaporation tube contraction type outlet is located, and a plurality of main combustion holes are formed in the flame tube inner ring and the flame tube outer ring respectively. By adopting the design of the segmented contraction type evaporation pipe and constructing a large-scale vortex structure at the head part of the combustion chamber, the working envelope of the combustion chamber is expanded, and normal ignition starting and stable combustion of the evaporation pipe combustion chamber in a high-altitude and high-speed environment can be met; the problems that due to changes of the flight height and the inlet speed, the stability of the combustion chamber becomes weak, the fuel atomization performance becomes poor, and consequently the starting envelope of the combustion chamber becomes narrow are solved.

Description

technical field [0001] The invention belongs to the technical field of small turbojet engines, in particular to a method for preparing a combustion chamber. Background technique [0002] With the rapid development of aviation technology, the application of micro-miniature aviation turbine engines using evaporator tube combustion technology is becoming more and more extensive. Companies such as AMT in the Netherlands, JetCat in Germany, and Artesjet all have a series of products. The advantage of the evaporator tube combustor is that the structure is simple, the engine can be miniaturized and lightweight, and it is more and more popular in military fields such as small air projectiles and air patrol bombs. This puts forward more requirements for the design of the evaporator tube combustor. High requirements require the engine to start normally and work stably at high altitude and high speed. [0003] However, the disadvantages of the evaporator tube combustion chamber are lo...

AI Technical Summary

Problems solved by technology

The head design scheme of wide envelope starting of the evaporation tube combustion chamber can greatly widen the working envelope of the combustion chamber, effectively solving the problem of difficult ignition and stable operation of the evaporation tube combustion chamber in harsh environments such as high altitude, low pressure, and high speed.

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