摘要固体火箭发动机点火瞬时是一个非常短暂的过程,但对于发动机的正常工作起着极为重要的作用。特别对于中小型固体火箭发动机,因其尺寸小、工作时间短、燃烧稳定性差的特点,点火问题尤为突出。61614
对固体火箭发动机点火过程进行合理简化的基础上,本文着重于点火压力载荷测试方法的研究。
首先,采用solidworks软件建立适当的火箭发动机模型,其中包括燃烧室壳体,堵头,喷管和壳体螺帽。其次是选择合适的测试系统,本文提出了2种测试系统,一种是基于单片机的测试系统,一种是基于数据采集系统的测试系统。结合实际情况,基于数据采集系统的方案是较为合理的。最后是选择合适的测量点位进行点火冲击载荷的测试工作。
最后得到了在不同点火药量下的发动机点火瞬时的压力-时间曲线,并结合曲线描述点火瞬间燃烧室内压强的分布和变化规律,为固体火箭发动机的改进设计和点火故障诊断等工程实际问题提供参考。
毕业论文关键词:固体火箭发动机 点火过程 压力载荷测试 数据采集系统
毕业设计说明书(论文)外文摘要
Title Rocket engine ignition pressure load test
ABSTRACT Instantaneous ignition of solid rocket motor is a very short process, but for engine work plays a very important role. Especially for small solid rocket motors, because of their smaller size, shorter working hours, poor combustion stability characteristics, ignition problem is particularly prominent.
Based on a reasonable simplification of the ignition process of solid rocket motor , this article focuses on pressure load measurement method of ignition.
First, the rocket engine uses SolidWorks software to establish appropriate models, including the combustor shell, plugs, nozzles and shell nuts. Followed by selecting appropriate test system, this article made two kinds of test systems, one test system is based on single-chip microcomputer, The other test system is based on the data acquisition system. Combined with the actual situation, programme based on data acquisition system is more reasonable. Finally, select the appropriate measurement points ignition test of impact loading.
Finally got the engine pressure-time curve of the ignition transient in different ignition charge mass , and curve describes the distribution and variation chamber pressure of the ignition and instantaneous combustion , improved design of solid rocket motor and ignition troubleshooting and with references of other practical problems .
Key Word :Solid rocket motor Ignition process Pressure load testing Data acquisition system
1绪论1
1.1引言1
1.1.1火箭发动机简介1
1.1.2 压力对发动机运作的影响2
1.1.3燃烧室压强-时间曲线的大致特点2
1.2 课题研究的背景和意义4
1.3 国内外的研究状况5
1.3.1 点火瞬态压强上升阶段预示研究状况5
1.3.2 点火瞬态装药结构完整性研究现状8
1.4 本课题研究的主要内容9
2 火箭发动机的结构设计10
2.1 引言10
2.2 建立固体火箭发动机模型10
2.2.1 燃烧室壳体模型建立10
2.2.2 堵头设计11
2.2.3 喷管设计12
2.2.4 试验火箭发动机壳体螺帽设计 13
2.2.5 火箭发动机整体装配模型13
2.2.6 火箭发动机点火装置设计15
2.2.7 火箭发动机的装药设计15
2.2.8 固体火箭发动机带药总体装配图16