An 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, so that when the fuel enters a supercritical state or a gas state from a liquid state, the cross-sectional area of ​​the fuel injection hole is adaptively adjusted according to the fuel pressure change, and the fuel injection pressure is kept stable. In order to ensure stable combustion of the engine during the fuel switching process, it includes a shell with one end open, and an end flange is installed on the open side of the shell, and the side of the shell inner cavity facing away from the end flange is sequentially provided with a confluence cavity and a downstream cavity The needle cone is inserted into the inner cavity of the housing, and the head of the needle cone penetrates the confluence cavity and extends to the downstream chamber. The connection between the confluence cavity and the downstream chamber is provided with a Inner channel wall. The invention also provides an active cooling engine fuel switching method. The invention is especially suitable for fuel stable switching of active cooling engines, 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...

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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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