Center staged combustion chamber based on self-excitation sweeping oscillation fuel nozzles

Abstract

The invention provides a center staged combustion chamber based on self-excitation sweeping oscillation fuel nozzles. The center staged combustion chamber based on the self-excitation sweeping oscillation fuel nozzles comprises an outer shell, a main combustion stage and a pre-combustion stage, wherein a cavity is formed in the outer shell; the main combustion stage and the outer shell are coaxially arranged; and the pre-combustion stage and the outer shell are coaxially arranged. An annular fuel oil channel is used for being connected with the multiple self-excitation sweeping oscillation fuel oil nozzles, and the self-excitation sweeping oscillation fuel oil nozzles are suitable for spraying oscillation oil liquid to a first-stage rotational flow channel. Fuel oil is output in a fan shape through the self-excitation sweeping oscillation fuel oil nozzles and is dispersed by rotating incoming flow passing through the rotational flow channel, so that the atomization performance and the space distribution uniformity of the fuel oil can be greatly improved. Meanwhile, the annular fuel oil channel is further formed in the main body part of the main combustion stage, and the fuel oil channel is connected with an oil conveying pipe and communicates with the self-excitation sweeping oscillation fuel oil nozzles, so that the compact and miniaturized structural design is achieved.

Description

technical field [0001] The invention belongs to the technical field of the central staged combustor scheme of an aero-engine, and in particular relates to the fuel injection and atomization technology of a gas turbine main combustor. Background technique [0002] The main requirement of civil aero-engine combustors is to reduce pollution emissions, and the main requirement of military aero-engine combustors is to increase the outlet temperature. The development trend of the combustion organization of both is to adopt a central staged combustor, that is, the center of each head of the combustor. Is the pre-combustion level flame, surrounded by the main combustion level flame, such as figure 1 shown. The pre-combustion stage generally includes a centrifugal pressure nozzle, one or a pair of radial swirlers, and the swirlers are used to improve the atomization performance of the fuel and form a non-premixed flame. The pre-combustion stage is mainly used in various engine proce...

AI Technical Summary

Problems solved by technology

Pre-film spraying has the problem of complex structure and difficult implementation on large nozzles

In the first two wall radial injection schemes, the penetration depth of fuel is controlled by the momentum ratio. Under large operating conditions, the penetration depth is large, and the mixing of fuel and main combustion stage swirl is stronger, but the radial distribution uniformity Still not good enough; but under small working conditions, the fuel flow rate is small and the momentum ratio is low, often prone to insufficient penetration depth, which affects fuel mixing; in addition, some fuel is easily attached to the inner wall of the channel, causing coking or spontaneous combustion backfire

Therefore, the existing fuel injection mainly adopts simple round-hole direct injection nozzles, and there is still a lot of room for improvement in the uniformity of fuel mixing.

Images