Evaporating pipe structure for engine combustion chamber and engine combustion chamber structure

Abstract

The invention discloses an evaporating pipe structure for an engine combustion chamber and an engine combustion chamber structure. An internal concave curved surface section composed of at least two cambered surfaces is utilized, two column cambered surfaces arranged symmetrically are adopted in each cambered surface, the internal concave curved surface section adopts a gradual contracting and gradual stretching structure, mixed gas flows through an evaporating pipe, a backflow area is formed in the internal concave curved surface section, the speed is reduced, the mixed space of fuel oil andair is increased, stay time in the evaporating pipe is prolonged, the contact area of the mixed gas and the wall face of the evaporating pipe is increased, and gas heat exchange is enhanced. By meansof the gradual contracting and gradual stretching curved wall face, the strong shearing effect brought by the gas enables the fuel oil and the air to be mixed more fully. Fins are arranged on the outer surface of a first cylinder section, heat exchange between high-temperature airflow in a flame cylinder and the evaporating pipe is enhanced, and the temperature in the evaporating pipe is increased. Mixing holes form oblique holes to jet flow to enable air to directly impact oil fog, atomizing evaporation of the fuel oil is promoted, the atomizing and evaporating effect of the fuel oil in the evaporating pipe is enhanced, the fuel oil is combusted fully, and emission of pollutants is reduced while the combustion efficiency is improved.

Description

technical field [0001] The invention belongs to the field of engine combustion systems, and in particular relates to an evaporation tube structure for an engine combustion chamber and an engine combustion chamber structure. Background technique [0002] A new generation of high-performance micro-engines adopting a direct-flow annular combustion chamber is the current development direction. This kind of miniature DC combustor is limited by the space layout. In terms of fuel atomization and evaporation, the evaporator tube with simple structure and low fuel supply pressure is generally used for fuel supply. Structurally, it does not have a swirler, and the atomization and evaporation of fuel depends entirely on the evaporation tube. The combustion chamber adopting the evaporation tube scheme has the advantages of simple structure, easy processing, low cost and good comprehensive combustion performance. [0003] The design of the evaporator tubes in the miniature combustor is...

AI Technical Summary

Problems solved by technology

The evaporation tubes used in most micro-combustion chambers are straight, T or L-shaped structures, which can improve combustion efficiency to a certain extent, but the effect is poor

The other part adopts spiral tube evaporating tube and electric heating evaporating tube, but the spiral evaporating tube is easy to block, and the evaporation rate is not high, while the electric heating system is too complicated and the maintenance cost is high

The research on the structural design of the evaporation tube needs to be improved. At the same time, the welding or repair welding in the process of manufacturing and repairing the engine combustion chamber will lead to the loss of material properties. After welding or repair welding, some parts cannot be stress-relieved and restored by heat treatment. , has a great impact on product performance and quality, how to restore or enhance the weld performance has always been a difficult process problem to solve

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