A dual-cavity flame-stabilized combustion device based on air-staged reverse jet technology

Abstract

The invention provides a double-concave-cavity flame stabilized-combustion device based on an air staging and reverse jetting technology. The device comprises a secondary air feeding distributing preheating section, a flame stabilizing concave-cavity section, a spiral-flow type inclined seam reverse-jetting section and a gradual-expanding and gradual-contracting outlet section which share one axis and are sequentially connected. According to the device, a distributing plate is arranged at the head part; a combustion area in a combustion chamber is divided through air entering in a spiral-flow type inclined seam reverse jetting manner from the wall surface of a main flowing channel and the gradual-expanding and gradual-contracting outlet section; air flowing in through inclined holes in two sides of the distributing plate enters a concave cavity and is mixed and disturbed with the air entering from the front wall surface and the rear wall surface of the concave cavity, thus prompting the combustion in the main combustion area in the concave cavity; the inner combustion area of the main flowing channel is divided into three combustion areas through an air flow wall formed by the air entering from the center of the distributing plate and two air flows entering in the spiral-flow type inclined seam reverse jetting manner, so that flame remains high stability in case of large air input, and as a result, the combustion efficiency can be improved, and the stabilizing combustion range of the device can be expanded; meanwhile, the temperature can be uniformly axially distributed, thus local excessively-high temperature can be avoided, and as a result, the service life of the device can be prolonged.

Description

technical field [0001] The invention relates to the technical field of engine combustion control, in particular to a dual-cavity flame-stabilized combustion device based on air-stage reverse jet technology. Background technique [0002] As a widely used power machine, the engine has penetrated into all major economic sectors. Its application fields involve sea, land, air and other aspects, and its service objects benefit military and civilian use. The combustion chamber is an important part of the engine, and the development of a stable, efficient and low-pollution engine combustion chamber is the goal pursued by researchers. Because the fuel in the combustion chamber is in a high-speed flow, it is usually difficult to ignite, mix and burn the fuel. In the prior art, in order to make the fuel ignite more smoothly, a concave cavity is usually arranged in the ignition area. The airflow flowing through the concave cavity will form a recirculation zone in the cavity. Under the ...

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Problems solved by technology

[0003] But the inventor of the present application has found through research that there are also the following defects in the engine with the concave cavity: the first, the traditional combustion chamber with the concave cavity, under the main straight channel air intake mode, the combustion zone formed at the bottom of the concave cavity is comparatively Stable, the combustion area on the upper part of the concave cavity is not stable enough, and the fuel combustion efficiency still needs to be improved; second, the existing combustion chamber adopts a single air inlet, and the residence time of the fuel in the concave cavity is not long, resulting in insufficient fuel combustion; 3. The unburned gas in the concave cavity enters the main channel, and the combustion zone gradually moves to the rear of the combustion chamber, which may easily cause the local temperature in the combustion chamber to be too high and the temperature distribution to be uneven. Fourth, the air intake in the existing engine combustion chamber is relatively large hours, the combustion is relatively stable, but there is a contradiction between the large flow required by the high-power combustion device and the blow-out phenomenon

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