【作者】 高飞；

【导师】 武志文；

【作者基本信息】 北京理工大学 ， 航天工程， 2015， 硕士

【摘要】 燃气发生器作为导弹姿轨控发动机的重要组成部分,承担着为发动机提供所需推力的任务。双脉冲燃气发生器可以实现两次点火,提供两次不连续的推力,能够显著改善导弹的机动性与可控性,提高导弹的生存与作战能力。因此,对双脉冲燃气发生器的设计与研究具有十分重要的意义。本文基于某科研项目,研究设计满足给定性能指标要求的双脉冲燃气发生器,研究内容主要包括以下几个方面:首先通过对双脉冲燃气发生器的设计技术指标进行分析,完成了对燃气发生器两次脉冲装药的设计,通过对燃气发生器的内弹道仿真计算,初步检验了燃气发生器装药设计的合理性。其次基于总体结构尺寸要求,完成了对双脉冲燃气发生器的结构设计,其中包括燃烧室结构设计、端盖结构设计、点火结构设计、喷管结构设计等,并通过理论计算与数值仿真的方法验证了燃烧室结构强度满足性能要求,初步验证了结构设计的合理性。然后基于设计指标对热防护的要求,通过fluent软件,利用数值模拟的方法,对双脉冲燃气发生器整个工作过程的传热进行仿真分析,仿真结果表明,壳体温度在可接受范围内波动,燃烧室的热防护设计满足性能要求,为后续的实验研究提供理论参考。最后围绕影响燃烧室传热的三个影响因素,利用fluent软件,仿真分析其对燃烧室传热的影响规律,仿真结果表明,燃气发生器工作时间对燃烧室传热影响最大,燃气温度次之,绝热层材料的导热系数影响最小。更多还原

【Abstract】 Gas generator as an important part of the attitude and orbit control engine of the missile, are responsible to provide the necessary thrust for the engine. Dual-pulse gas generator has the ability of repeated ignition and the capability to provide twice variable thrust, which can significantly improve the flexibility and controllability of the missile and improve survival and combat capability of the missile. Therefore, the design and research of dual-pulse gas generator is of great significance. This article based on a certain research project, design a dual-pulse gas generator which based on the given performance requirements. And the main work of this paper is shown as follows:First, through careful analysis of the design specifications of the dual-pulse gas generator, solid propellants of the dual-pulse gas generator are designed, and the internal ballistics simulation of the dual-pulse gas generator which is preliminary tested the design justifiability of the solid propellants of the dual-pulse gas generator.Second, based on the overall structure size requirements, the dual-pulse gas generator structure is designed, which includes the design of the combustion chamber structure, the cover structure, the ignition structure, nozzle structure, and using the theoretical calculation and numerical simulation methods to check the combustion chamber structural strength meets the performance requirements, which is preliminary tested the design justifiability of the dual-pulse gas generator structure.Then, based on the design specifications of the heat protection requirements, through numerical simulation method of fluent software, the heat transfer throughout the working process of the dual-pulse gas generator has been simulated, and the simulation result shows that the combustion chamber shell temperature fluctuations within the acceptable range,combustion chamber thermal protection design meet the performance requirements, which has provided a theoretical reference for subsequent experiment studies.Finally, through surrounding the three factors which affect the heat transfer of the combustion chamber, using the fluent software, the heat transfer of the combustion chamber has been simulated and the law of influence the heat transfer has been analyzed, and the simulation result shows that the gas generator working time greatest influence on the heat transfer of combustion chamber, followed by the gas temperature, the thermal conductivity of insulation material with minimal impact.更多还原