Novel fuel injection system for self-adaptive pulse detonation engine

Abstract

The invention discloses a device for self-adaptive fuel injection into a combustion chamber of a pulse detonation engine, and provides a fuel injection system applicable to the self-adaptive pulse detonation engine. The system mainly comprises an oxidant supply system, a fuel supply system and an injection valve. By periodic pressure fluctuation in a pulse detonation combustion chamber, self-adaptive periodic on and off of a fuel supply passage can be realized, and periodic detonation combustion in the pulse detonation combustion chamber can be realized. By adoption of the fuel injection device, high injection pressure can be adopted for acquiring great atomizing effects; by fuel liquid crushing and mixing action of oxygen, fuel atomization is enhanced. By fuel supply delaying, fuel chamber entering time of a fuel slightly lags behind that of air, air entering the fuel chamber easily serves as isolation air to realize isolation between a high-temperature combustion product and a newlyfilled explosive mixture, an isolation gas system required by a current self-adaptive pulse detonation engine is not needed, and a system structure is simplified.

Description

technical field [0001] The invention relates to the technical field of aerospace engines, in particular to a novel fuel injection system for an adaptive pulse detonation engine. Background technique [0002] The pulse detonation engine is a new concept engine that uses periodic detonation combustion to generate thrust. It has potential technical advantages such as simple structure, high cycle efficiency, and wide operating range. Since the generation of detonation waves is periodic, increasing the operating frequency is one of the development directions for pulse detonation engines to increase thrust and improve working stability under certain geometric dimensions. However, the further increase in frequency is limited by the filling speed of the explosive mixture and the isolation process. [0003] At present, the fuel injection system of a pulse detonation engine is mostly controlled by a solenoid valve or a mechanical rotary valve. Due to structural limitations, conventi...

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Problems solved by technology

When using a lower barrier gas inlet pressure, if the fuel injection pressure is too high, the fuel will enter the combustion chamber before the barrier gas, which will cause slow combustion and cause fuel waste; while the lower fuel injection pressure It will affect the atomization of fuel, reduce the uniformity of fuel and air mixing, and then affect the combustion efficiency of fuel

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