航空学报 > 2024, Vol. 45 Issue (22): 130233-130233   doi: 10.7527/S1000-6893.2024.30233

横向复合过载下固体火箭发动机压强振荡

艾诗迪1, 李军伟1(), 田忠亮2, 韩磊3, 王宁飞1   

  1. 1.北京理工大学 宇航学院,北京 100081
    2.北京航天发射技术研究所,北京 100048
    3.中国北方工业股份有限公司,北京 100053
  • 收稿日期:2024-01-25 修回日期:2024-02-21 接受日期:2024-03-20 出版日期:2024-04-07 发布日期:2024-04-03
  • 通讯作者: 李军伟 E-mail:david78lee@bit.edu.cn

Solid rocket motor pressure oscillations under lateral composite overloads

Shidi AI1, Junwei LI1(), Zhongliang TIAN2, Lei HAN3, Ningfei WANG1   

  1. 1.School of Aerospace Engineering,Beijing Institute of Technology,Beijing  100081,China
    2.Beijing Institute of Space Launch Technology,Beijing  100048,China
    3.China North Industries Co. ,Ltd (NORINCO),Beijing  100053,China
  • Received:2024-01-25 Revised:2024-02-21 Accepted:2024-03-20 Online:2024-04-07 Published:2024-04-03
  • Contact: Junwei LI E-mail:david78lee@bit.edu.cn

摘要:

飞行条件下固体火箭发动机常经历复杂过载情况,其内弹道骤然抬升或振荡偶有发生。为研究动态过载条件下固体火箭发动机燃烧室内压强特性,根据Greatrix燃速增强模型和考虑燃面退移的零维内弹道模型获得了过载与推进剂燃面质量流量关系曲线;基于该关系对柱锥内孔装药进行了复合过载下的内流场仿真,研究了横向过载加速度、横向振动及振动频率对发动机动态压强特性和旋涡流动的影响。结果表明,随着横向过载加速度与横向振动的增大,燃烧室内平衡压强抬升和压强振荡幅值随之增大,在工作压强为10.54 MPa时加速度每增加1g,横向过载加速度能提高0.02%压强振幅及0.35%平衡压强;横向振动频率从7 Hz上升至320 Hz过程中,压强振荡幅值逐渐减小,但在燃烧室声腔固有频率附近会因共振作用被放大,一阶共振(160 Hz)使压强振幅从0.16%提高到0.30%,为原振幅2倍;当复合过载频率与燃烧室声腔共振时,能量从推进剂表面传递进入燃烧室的过程更为有序。

关键词: 固体火箭发动机, 复合过载, 压强振荡, 声腔共振, 流动特性

Abstract:

Solid rocket motors often experience complex overload conditions during flight, and sudden internal ballistic lift or oscillations occur occasionally. To study the pressure characteristics in the combustion chamber of solid rocket motors under dynamic overload conditions, the relationship curves between overload and mass flow rate of the propellant combustion surface are obtained using the Greatrix burning rate enhancement model and the zero-dimensional internal ballistic model considering the combustion surface recession. Based on the relationship, simulation of the internal flow field for a cylindrical cone bore charge is carried out under composite overload. The effects of lateral overload acceleration, lateral vibration and vibration frequency on the dynamic characteristics of the motor and vortex flow are investigated. The results show that with the increase of lateral overload acceleration and lateral vibration, the equilibrium pressure rises and pressure oscillation amplitude in the combustion chamber increases, and the lateral overload acceleration can increase the pressure amplitude and equilibrium pressure by 0.02% and 0.35%, respectively, with per 1g increase in acceleration at the working pressure of 10.54 MPa. As the lateral vibration frequency rises from 7 to 320 Hz, the amplitude of pressure oscillation decreases. But it is amplified by resonance near the intrinsic frequency of the combustion chamber acoustic cavity, and the first-order resonance (160 Hz) raises the amplitude of the pressure from 0.16% to 0.30%, which is twice the original amplitude. When the composite overload frequency resonates with the combustion chamber acoustic cavity, the energy transfer from the propellant surface into the combustion chamber is more orderly.

Key words: solid rocket motor, composite overload, pressure oscillation, acoustic cavity resonance, flow characteristics

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