注气式蓄压器系统工作特性仿真分析  

Simulation analysis on operating characteristics of gas-filled accumulator system

作　　者：万屹仑 付欣毓 张黎辉[1] 胡久辉 WAN Yilun;FU Xinyu;ZHANG Lihui;HU Jiuhui(School of Astronautics, Beihang University, Beijing 100191, China;Xi＇an Chaoyue Electromechanical Technology Co. LTD. , Xi＇an 710077;Beijing Institute of Astronautical Systems Engineering, Beijing 100076, China)

机构地区：[1]北京航空航天大学宇航学院,北京100191 [2]西安超越机电技术有限责任公司,陕西西安710077 [3]北京宇航系统工程研究所,北京100076

出　　处：《火箭推进》2018年第3期37-42,共6页Journal of Rocket Propulsion

摘　　要：以大型运载火箭POGO稳定性为研究背景,针对国内尚无型号应用的注气式蓄压器开展仿真研究。在建立注气式蓄压器动力学模型的基础上,利用航天飞机主发动机的相关参数验证了仿真计算的准确性。仿真计算了蓄压器对推进系统固有频率的影响和四种不同蓄压器的推进系统频率特性。研究了注气流量、注气温度、排气流量和排气时间对蓄压器工作特性的影响。仿真结果表明,随着蓄压器入口压力的增大,溢流孔靠近底部的蓄压器气枕压缩量减小;注气式蓄压器比贮气式蓄压器能够更有效地避免推进系统频率与箭体结构频率相交。With the POGO stability of a large launch vehicle as research background,the simulation analysis of a gas-filled accumulator was carried out without any application in China. On the basis of building the dynamic model of a gas-filled accumulator,the accuracy of simulation was validated by using the relevant parameters of the space shuttle main engine. The influences of the accumulator on the natural frequency of a propulsion system and the frequency characteristics of propulsion systems of four different pressure accumulators were calculated. The effects of injection flow rate,injection temperature,venting flow rate and venting time on the dynamic characteristics of accumulator were investigated. The simulation results indicate that the compression capacity of the accumulator＇s pneumatic die cushion at the bottom of overflow holes decreases with the increase of the inlet pressure. Besides,the gas-filled accumulator can more effectively avoid the intersection of propulsion system frequency and vehicle structural frequency in comparison with traditional accumulator. The research results have a certain reference significance for the development of gas-filled accumulator.

关 键 词：注气式蓄压器 推进系统 固有频率 POGO振动 

分 类 号：V43-434[航空宇航科学与技术—航空宇航推进理论与工程]