Phase change type paraffin-containing fuel ramjet engine

Abstract

The invention discloses a phase change type paraffin-containing fuel ramjet engine, which adopts an integrated design of a combustion chamber and a gasification chamber, and is compact in structure and high in energy utilization rate. A shell is heated by a large amount of heat released by combustion reaction in the combustion chamber, the surface of paraffin-containing fuel can be preheated under the action of radiation and heat convection, and meanwhile, ram air is heated, so that the surface of the fuel has higher temperature, and phase change of the fuel is facilitated. Mode conversion is easy to achieve, and automatic switching between a boosting section and a ramming section can be completed through change of pressure intensity. The head of the combustion chamber is provided with a conical hole with a certain inclination, so that the rotational flow of gas can be realized, and higher combustion efficiency can be further obtained. When the boosting section and the ramming section are switched, a mixture of a phase change product and air generates rotational flow under the action of the conical hole when flowing into the combustion chamber, so that the mixing effect is good. The engine is adjustable in size, wide in application range, and suitable for power systems of supersonic aircrafts.

Description

technical field [0001] The invention relates to the design and manufacture technology of a ramjet, in particular to a phase-change type paraffin-fuel-containing ramjet with good fuel mechanical properties and high combustion efficiency; it is suitable for a power system of a supersonic aircraft. Background technique [0002] The rocket ramjet is an air-breathing engine that uses oxygen in the air to burn with its own fuel. According to the different fuel forms, it can be divided into three types: solid rocket ramjet, liquid fuel ramjet and solid fuel ramjet. Among them, the solid rocket ramjet has the characteristics of easy combustion organization and simple structure, but because the fuel-rich propellant it uses contains part of the oxidizer, the specific impulse is relatively low, while the liquid fuel ramjet and solid fuel ramjet only carry fuel, so energy levels are higher. For liquid fuel ramjet engines, kerosene is generally used as fuel, which has the advantages of ...

AI Technical Summary

Problems solved by technology

[0005] The paraffin fuel ramjet disclosed in the literature has the following deficiencies: the solid fuel that adopts pure paraffin as the main component has the defect of poor mechanical properties, and may cause fracture problems when the ramjet works; the heterogeneous combustion reaction between the paraffin fuel and air is affected. Diffusion reactions are limited, and the residence time of high-speed incoming air is short, making the engine combustion inefficient

In order to solve the problem of low combustion efficiency, the size of the air preheating chamber and the post-combustion chamber can be lengthened so that the fuel and air can be mixed evenly, but this makes the overall size of the engine longer, which has certain limitations on practical applications

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