水下固体火箭发动机燃气射流及推力特性研究

项目名称： 水下固体火箭发动机燃气射流及推力特性研究

项目编号： No.11272055

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 数理科学和化学

项目作者： 李世鹏

作者单位： 北京理工大学

项目金额： 78万元

中文摘要： 以用于深水高速航行器助推用固体火箭发动机为背景，针对发动机燃气射流注入水中形成的含有高压、高速、高密度比、非稳态、湍流等复杂因素的气、液两相流过程，通过数值仿真研究复杂流场结构的特点及其对发动机推力和燃烧过程的影响，探索水下推力测试方法。首先，建立水下超音速气体射流数学模型，结合数值模拟得到的射流流场状态及形貌结构特点，分析发动机推力与工作水深、燃烧室压强、喷管扩张比等参数的关系；其次建立推进剂燃烧与水下超音速气体射流的耦合计算模型，研究排气反压对发动机工作过程的影响，分析发动机点火建压过程中推力爬升和负推力等现象出现的原因；最后开展推力测试方法和数据处理方法研究。研究成果可为水下固体火箭发动机的结构设计和性能预估提供理论依据和技术参考。

中文关键词： 水下超音速燃气射流；气液两相流；燃烧；点火模型；推力振荡测试

英文摘要： When the hot gas generated from a solid rocket motor used for a high speed underwater vehicle inject into water, the process is essentially unsteady and turbulent; additionally, the high ambient pressure, high velocity and high water-to-gas density ratio can result in complicated flow structures. The different characteristics between the underwater engines and the aero engines must be take into consideration when the motor is used as propulsion devices for high speed underwater vehicles. Both numerical simulation and experimental study are needed. The mathematical model and numerical simulation of supersonic gaseous jets injected into water is needed to investigate the characteristic of the motor. Combined with the simulation results, the relationship with water depth, combustion pressure and expansion ratio should be analyzed. The coupling model between the process of solid propellant combustion and the process of gaseous jets injected into water is also needed to investigate the influence of exhaust plume to the motor's thrust. The caution of thrust climb up process, the negative thrust and thrust vibration appeared when the motor working a the deep water can be analyzed based on the simulation results. The study of design conception of the thrust stand, experimental measurement method and data processing meth

英文关键词： supersonic gas jet underwater；gas-liquid two-phase flow；combustion；ignition model；thrust oscillation test