Premixing chamber of aircraft engine flame tube and design method thereof

Abstract

The invention provides a premixing chamber of an aircraft engine flame tube and a design method thereof. The premixing chamber is of a cylindrical structure, and the premixing chamber is arranged between a fuel nozzle, a flame tube cyclone outlet and a flame tube head, to achieve oil and gas premixing. The method for designing the premixing chamber of the aircraft engine flame tube comprises the following steps: (1) determining the inner diameter D of the premixing chamber; and (2) determining the axial length L of the premixing chamber; (3) determine the distance P of a main spray cone angleof the fuel nozzle at a droppoint of the wall surface of the premixing chamber; (4) determining that an auxiliary spray cone angle of the fuel nozzle does not collide with the wall surface of the premixing chamber, and flame is directly sprayed into the flame tube. According to the premixing chamber of the aircraft engine flame tube and the design method thereof, the size of the premixing chambercan be accurately designed, the workload in the combustion chamber testing process is reduced, manpower and material resources are saved to the largest extent, and the premixing chamber has an obviouseffect of reducing exhaust smoking of a combustion chamber and improving combustion stability of the combustion chamber.

Description

technical field [0001] The invention belongs to the technical field of aero-engine combustion chamber design, and in particular relates to a premix chamber of an aero-engine flame cylinder and a design method thereof. Background technique [0002] In the development process of the aero-engine combustor, the premix chamber structure was used on the flame tube very early. It is a premix chamber installed at the outlet of the fuel nozzle and the flame tube swirler, and the oil and gas are realized in the premix chamber. Pre-mixing, practice has proved that the existence of the pre-mixing chamber has a significant effect on reducing the exhaust smoke of the combustion chamber and improving the combustion stability of the combustion chamber. However, if the design is improper, not only these advantages of the premixing chamber cannot be displayed, but also disadvantages, such as the length of the premixing chamber is too long, and serious carbon deposits will occur in the premixi...

AI Technical Summary

Problems solved by technology

However, if the design is not proper, not only these advantages of the premixing chamber cannot be displayed, but also disadvantages, such as the length of the premixing chamber is too long, serious carbon deposits will occur in the premixing chamber, etc.

In the prior art of aero-engine combustors, there is no design method for premixed chambers, so there is blindness in determining the size, which increases the workload in the process of debugging the combustors, and greatly wastes manpower and material resources

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