摘要固体燃料冲压发动机（Solid Fuel Ramjet，简称SFRJ）是一种自带燃料，利用空气中的氧进行燃烧的新型吸气式发动机，它利用迎面高速空气流的冲压作用提高燃烧室压强，并使空气中的氧和富燃的固体燃料燃烧，利用拉瓦尔喷管使燃气高速喷出，产生推力。69428

为了提高冲压发动机中固体燃料的装药量，同时维持入口处一定的台阶高度，从而保证火焰的稳定性，本文以PE为固体燃料，设计了前台阶内型面结构，通过地面直连式实验系统，对其在冲压发动机中的燃烧性能进行研究，并分析了不同的药柱台阶高度的影响。结果表明，对于带台阶的固体燃料，台阶高度越高，平均燃速越高，与传统内孔固体燃料相比，将固体燃料设计成阶梯孔结构有助于提高固体燃料的平均燃速；对于带台阶的固体燃料，在固体燃料前段，当地燃速较小，随着轴向的推移，当地燃速逐渐增大，在台阶处达到最大值，台阶之后当地燃速逐渐减小，在固体燃料尾部，当地燃速减小速率增大，但整体来说，台阶之后的当地燃速普遍大于台阶之前的当地燃速。补燃室压强在点火发动机工作阶段会产生压强峰，随后燃烧室压强基本稳定，但是，后段内径35mm的固体燃料补燃室压强在工作稳定阶段下降明显，后逐渐与其他工况相似；后段内径为35mm的固体燃料燃气流量最大，空燃比最小，其余三种工况没有明显的变化趋势；随着后段内径的减小，特征速度有所增加。

毕业论文关键词  固体燃料冲压发动机  聚乙烯  内型面  燃烧特性  直连式实验

毕业设计说明书外文摘要

Title  Experimental study of the stepped inner-surface solid fuel ramjet combustion performance

Abstract

Solid fuel ramjet (Solid Fuel Ramjet, Acronym SFRJ) is a carrying fuel, the use of oxygen in the air for combustion New aspirated engine, which uses high-speed head-punching action to improve air flow chamber pressure, and air the oxygen-rich combustion and combustion of solid fuels, the use of high-speed spray Laval nozzle so that the gas to generate thrust.

In order to increase the amount of charge in the solid fuel ramjet, while maintaining a certain entrance step height, so as to ensure the stability of the flame, the paper PE solid fuel, a step in the design of the front-surface structure, through the ground directly connected Experiment system, its combustion ramjet performance in the study and analysis of the degree of influence of different grain level. The results show that, for stepped solid fuel, the higher the step height, the higher the average burning rate, compared with the traditional hole solid fuel, solid fuel is designed to help increase the average pore structure stepped burning rate of solid fuels; for solid fuel stepped in front of solid fuel, smaller local burning rate, over the axial direction, the local burning rate increases, reaches a maximum level at the local level after the burning rate decreases, the solid fuel tail, burning rate decrease local rate increases, but on the whole, the local level after the burning rate is generally higher than the local level before burning rate. Afterburner chamber pressure in the engine ignition phase will produce pressure peaks, then the basic stability of the combustion chamber pressure, however, after the inner diameter of 35mm solid fuel afterburner chamber pressure decreased significantly in the stable phase, and gradually other similar conditions; after the inner diameter of 35mm maximum gas flow of the solid fuel, the minimum air-fuel ratio, the remaining three conditions no significant change trend; with the reduced inner diameter segment, wherein the speed increase.

Keywords  SFRJ  Polyethylene  The inner profile  Combustion Characteristics  Direct Attach test