Combustion chamber of a sub-combustion ramjet engine

Abstract

The invention belongs to the technical field of sub-combustion ramjet engines, and discloses a combustion chamber of sub-combustion ramjet engines, which include sequentially arranged and sequentially connected: an isolation section, a sudden expansion section, a concave cavity, an equal straight section and an exhaust nozzle; the isolation The distance between the respective bottom plates of the section, the sudden expansion section, and the concave cavity increases sequentially from the top; the support plate structure is provided with a support plate cavity, and the support plate structure is provided with a fuel inflow port, a high-temperature bleed air port and a A plurality of injection holes communicated with the cavity of the support plate. The invention adopts the combination of the sudden expansion section, the concave cavity and the support plate structure, so that the mixing effect of the fuel and the incoming air is good; the support plate structure is arranged obliquely, and the fuel mixture sprayed by the support plate structure has a wide distribution range in the flow channel; The fuel and the high-temperature bleed air flow are pre-contacted in the support plate cavity, so that the fuel can gain energy, which is convenient and fast to participate in combustion, and the ignition speed is fast; the concave cavity can form a continuous and stable flame, which is helpful for spreading and stabilizing the flame.

Description

Technical field

[0001] The invention relates to the technical field of sub-combustion ramjet engines, in particular to a sub-combustion ramjet engine combustion chamber. Background technique

[0002] The ramjet is an air jet engine that relies on the deceleration and supercharge of the high-speed oncoming air flow. Its structure is simple. There are no complicated rotating parts like the compressor and turbine of the turbojet engine. The air entering the engine is compressed by high-speed Obtained by stagnation of airflow (ram pressurization). Ramjets can be divided into two types: sub-combustion ramjet (subsonic combustion ramjet) and supersonic ramjet (supersonic combustion ramjet).

[0003] The combustion chamber is the core component of the sub-combustion ramjet engine. Since the sub-combustion ramjet engine works at high altitude, the ambient temperature is low, the air density in the combustion chamber is very low, and the airflow velocity at the inlet of the combustion cham...

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