A pulse detonation propulsion device based on regenerative cooling structure

Abstract

The invention provides a pulse detonation pushing device based on a regenerative cooling structure. Based on the regenerative cooling structure, a convection / impact composite type heat exchange methodis adopted, liquid fuel oil is heated, catalyzed and cracked through heat radiation of detonation combustion, micromolecule gas fuel excellent in detonation performance is generated, the time and distance of deflagration to detonation transition (DDT) of a pulse detonation engine can be effectively shortened, and meanwhile efficient cooling of the wall face of a detonation pipe can be achieved. The catalytic and cracking fuel oil pretreatment method is adopted, the detonation performance of fuel is effectively improved, and meanwhile the pushing performance and safety of the engine are improved. The regenerative cooling structure provides a heat source for a catalytic and cracking reaction, and meanwhile airborne fuel oil is adopted as cooling media to cool the wall face of the detonationpipe. Temperature distribution of the wall face of the detonation pipe is considered, the convection / impact composite type cooling manner is adopted on the DDT segment of the detonation pipe, and a microchannel inner convection heat exchange manner is adopted in the detonation spread segment.

Description

technical field [0001] The invention relates to the field of engines, in particular to a pulse detonation propulsion device based on a regenerative cooling structure. Background technique [0002] The pulse detonation engine is an unsteady new concept attack that uses intermittent live pulse detonation waves to generate thrust. The propagation speed of the detonation wave can reach 2000m / s, and the chemical reaction rate of the detonation combustion is extremely fast, and the fresh reactants are converted into high-temperature and high-pressure combustion products before they can expand, so the detonation combustion is similar to isovolumic combustion. Engines based on detonation combustion have a higher thermal cycle efficiency than engines employing slow-burn combustion. However, there is still a certain gap between the actual performance of the detonation engine and the theoretical value at this stage, and the research on the pulse detonation engine is in the initial sta...

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Problems solved by technology

When liquid fuel is used, the flue gas temperature after detonation combustion exceeds 3500K. At this time, each part in the detonation tube bears a huge heat load, and the traditional cooling method can no longer solve the cooling problem of the hot end parts.

[0005] In view of the above problems, in order to achieve high-performance and stable operation of the detonation engine using liquid fuel, a new pulse detonation engine detonation tube structure must be designed to solve the problem of long detonation time, long detonation distance and thermal protection of hot-end components during the working process. The problem

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