Active cooling engine fuel switching device and switching method

Abstract

The invention relates to the field of engine fuel injection, and provides an active cooling engine fuel switching device. According to the active cooling engine fuel switching device, when fuel entersa supercritical state or a gaseous state from a liquid state, the sectional area of a fuel injection hole is adaptively adjusted according to the fuel pressure change, the fuel injection pressure iskept stable, and thus stable combustion of an engine in the fuel switching process is ensured. The device comprises a shell with an opening in one end, an end face flange is installed on the opening side of the shell, a confluence cavity and a downstream cavity are sequentially formed in the side, away from the end face flange, of an inner cavity of the shell, a needle cone is inserted into the inner cavity of the shell, the head of the needle cone penetrates through the confluence cavity and extends into the downstream cavity, and an inner runner wall surface matched with the side wall of theneedle cone is arranged at the joint of the confluence cavity and the downstream cavity. The invention further provides an active cooling engine fuel switching method. The method is particularly suitable for stable fuel switching of the active cooling engine, and has high social use value and application prospect.

Description

technical field [0001] The invention relates to the field of engine fuel injection, in particular to an active cooling engine fuel switching device and a switching method. Background technique [0002] Actively cooled engines require fuel to cool and protect the walls of the engine's combustion chamber before being injected into the combustion chamber for combustion. The advantages of active cooling technology are reflected in the following aspects: [0003] 1) Cool the combustion chamber, protect the combustion chamber from combustion damage, and prolong the working life of the combustion chamber; [0004] 2) It can preheat fuel, improve combustion efficiency, and obtain greater thrust; [0005] 3) A cooling channel is provided inside the combustion chamber to reduce the weight of the combustion chamber. [0006] As the total temperature of the combustion chamber increases, the temperature of the fuel flowing out of the cooling channel of the combustion chamber also incr...

AI Technical Summary

Problems solved by technology

[0007] However, due to the instantaneous increase of the injection area when switching, there is a certain lag in the establishment of the injection pressure, resulting in a decrease in the penetration depth, an instantaneous drop in the total pressure and thrust of the combustion chamber, resulting in a decrease in engine combustion efficiency, and may even cause the engine to stall during the switchover process.

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