Fuel injection system and method applicable to regenerative cooling detonation combustor

Abstract

The invention provides a fuel injection system and method applicable to a regenerative cooling detonation combustor. The system mainly comprises a fuel tank, a fuel booster pump, a detonation combustor first-stage heat exchanger, a detonation combustor second-stage heat exchanger, regenerator, a by-pass regulating valve, a low-pressure-ratio turbine, an excitation generator, a gas-liquid separation chamber and an atomizing nozzle. According to the system, high-temperature and high-pressure hydrocarbon fuel does work through expansion in a turbine mounted coaxially with the excitation generatorin the regenerative cooling process so as to transfer the high-heat flow on the wall surface of the combustor, heat energy is converted into electric energy, and the regenerative cooling capacity isremarkably improved; separation of micro-molecule gaseous fuel from macro-molecular liquid fuel after splitting is realized according to the density difference of low-temperature and high-pressure mixed-state fuel after working through expansion, and the liquid fuel is atomized by the rotational micro-molecule gaseous fuel flow having the excellent detonation performance to be injected into the combustor, so that the problem about pressure pulsation of traditional mixed-state fuel injection can be solved effectively, uniform atomizing and mixing can be realized, and then efficient detonation and combustion can be realized.

Description

technical field [0001] The invention relates to the field of detonation engines, in particular to a fuel injection system and method suitable for regenerative cooling of detonation combustion chambers. Background technique [0002] The detonation propulsion engine is a new concept engine based on detonation combustion. The chemical reaction rate of detonation combustion is extremely fast. The detonation wave generated by its combustion is directly used in the combustion chamber to compress the gas, and the fresh reactants are converted into Combustion products of high temperature and high pressure, so detonation combustion is similar to constant volume combustion. Therefore, the engine thermal cycle based on detonation combustion has higher thermal efficiency than the traditional slow combustion combustion method. In addition, the structure of the detonation engine is relatively simple, omitting compressors, turbines and other components, and has a high thrust-to-weight rat...

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Problems solved by technology

[0006] Combined with the existing research and design scheme of regenerative cooling detonation combustor, the present invention proposes a fuel injection system and method suitable for regenerative cooling detonation combustor to solve the pressure pulsation problem of gas / liquid mixed fuel injection and realize uniform atomization Blending, high-efficiency detonation and combustion, while meeting the cooling requirements of the wall of the detonation combustion chamber under high-frequency and long-term working conditions

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