Beveling main combustion hole rotation aiding low-pollution backflow combustion chamber

Abstract

The invention provides a beveling combustion hole rotation aiding low-pollution backflow combustion chamber which is of a single annular cavity structure. The beveling combustion hole rotation aiding low-pollution backflow combustion chamber is composed of combustion chamber boxes, a flame tube inner wall, a flame tube outer wall, a big bended tube, a small bended tube and combustion chamber heads, air entering from an inlet enters the combustion chamber through a diffuser, airflow is divided into three portions, the three portions of the airflow respectively enter the flame tube, the first portion of the airflow enters from the combustion chamber heads via swirl cups and head cooling holes, the second portion of the airflow enters the flame tube from main combustion holes, and the third portion of the airflow is used for cooling the flame tube wall and enters the flame tube from film holes and beveling holes formed in the inner wall of the flame tube, the outer wall of the flame tube, the wall of big bended tube and the wall of the small bended tube, and the airflow in the flame tube is discharged from the combustion chamber after combusting, being mixed and turning by 180 degrees. A swirl cup air atomizing nozzle is applied to each combustion chamber head, and a diffusive combustion organization mode is applied. Each inner ring main combustion hole of the flame tube and the flame tube wall surface form an angle with certain degrees in the circumferential direction, and each outer ring main combustion hole of the flame tube and the flame tube wall surface form an angle with certain degrees in the circumferential direction, and airflow of each inner ring main combustion hole and each outer ring main combustion hole and airflow of each upper wall main combustion hole, corresponding to one head swirl cup, of the flame tube and each lower wall main combustion hole, corresponding to one head swirl cup, of the flame tube form tangential airflow. The beveling combustion hole rotation aiding low-pollution backflow combustion chamber enables spray combustion to be more uniform, and can reduce pollutant discharge.

Description

technical field [0001] The invention relates to the technical field of a recirculation combustion chamber, in particular to a low-pollution recirculation combustion chamber with a chamfered main combustion hole assisting the rotation. Background technique [0002] The basic performance and structural distribution of modern aero-engine combustion chambers have reached a very high level, but for modern aero-engine combustion chambers, there are still a lot of problems and challenges, the development and application of new materials, new processes, new structures, and new concepts It is the source of guaranteeing its continuous progress. [0003] The main development trend of modern civil aircraft engine combustion chamber is low-polluting combustion. Civil aircraft engine combustion chambers must meet increasingly stringent aero-engine pollution emission standards. The currently adopted CAEP6 (Committee on Aviation Environmental Protection) standard has very strict regulatio...

AI Technical Summary

Problems solved by technology

[0006] China's Beijing University of Aeronautics and Astronautics has also applied for a number of patents such as 200910238793.X, 201010101574.X, 201010034141.7, 201010277014.X and other low-pollution combustion chambers. The scheme adopted is that the pre-combustion stage adopts the diffusion combustion method, and the main combustion stage adopts premixing Combustion mode, the main combustion stage is a ring structure, axial or radial oil supply, using multi-point injection or pre-film atomization, the purpose is to reduce NOx emissions under large working conditions, so that the NOx emissions of the entire LTO cycle have been reduced, but it is difficult to further reduce the NOx emission level of the entire LTO cycle

Images