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水下超声速过膨胀燃气射流的流场特性

张春 郁伟 王宝寿

张春,郁伟,王宝寿.水下超声速过膨胀燃气射流的流场特性[J].航空动力学报,2022,37(8):1633‑1642. doi: 10.13224/j.cnki.jasp.20210370
引用本文: 张春,郁伟,王宝寿.水下超声速过膨胀燃气射流的流场特性[J].航空动力学报,2022,37(8):1633‑1642. doi: 10.13224/j.cnki.jasp.20210370
ZHANG Chun,YU Wei,WANG Baoshou.Flow field characteristics of underwater supersonic over⁃expanded gas jet[J].Journal of Aerospace Power,2022,37(8):1633‑1642. doi: 10.13224/j.cnki.jasp.20210370
Citation: ZHANG Chun,YU Wei,WANG Baoshou.Flow field characteristics of underwater supersonic over⁃expanded gas jet[J].Journal of Aerospace Power,2022,37(8):1633‑1642. doi: 10.13224/j.cnki.jasp.20210370

水下超声速过膨胀燃气射流的流场特性

doi: 10.13224/j.cnki.jasp.20210370
详细信息
    作者简介:

    张春(1988-),男,工程师,博士生,主要从事水下发射技术方面的研究。E⁃mail:zh_ch_@live.cn

  • 中图分类号: V231.1

Flow field characteristics of underwater supersonic over⁃expanded gas jet

  • 摘要:

    为研究水下超声速过膨胀燃气射流的流场特性,在压力水筒中开展了大扩张比锥形喷管的固体火箭发动机水下点火实验,并基于雷诺时均Navier⁃Stokes(RANS)方法和流体体积(VOF)模型进行数值求解,分析了过膨胀燃气射流与水介质的相互作用过程。研究表明:超声速过膨胀燃气建立射流通道后,射流核心区长度随喷管落压比的减少而减少;射流核心区剧烈振荡,表现为高频的膨胀和收缩,振荡频率随喷管落压比的减小而增加,范围为100~200 Hz;射流边界不断振荡,并伴随波系结构变化,当过膨胀程度较大时,激波进入喷管使其发生流动分离现象,流动分离点周期性往复移动;分离区内压力脉动没有显著的特征频率,主要集中在100~600 Hz的宽频带,锥形喷管水下流动分离的简易判据为喷管出口压力不低于环境背压的0.44倍。

     

  • 图 1  水下燃气射流实验系统

    Figure 1.  Experimental system of underwater gas jet

    图 2  实验发动机照片

    Figure 2.  Photograph of experimental motor

    图 3  数值计算域与网格

    Figure 3.  Computational domain and mesh

    图 4  仿真与实验结果对比曲线

    Figure 4.  Comparison curve between experimental and simulation results

    图 5  水下燃气射流瞬时形态和时均形态

    Figure 5.  Instantaneous and time averaged forms of underwater gas jet

    图 6  水下燃气射流核心区膨胀和收缩过程

    Figure 6.  Expansion and contraction process of underwater gas jet core

    图 7  典型时刻下的燃气泡形态仿真结果

    Figure 7.  Simulation results of gas bubble shape at typical moments

    图 8  t=100 ms时刻的超声速燃气射流流场图

    Figure 8.  Flow filed graph of supersonic jet at t=100 ms

    图 9  典型射流振荡过程的流场压力分布

    Figure 9.  Pressure distribution of flow field in a typical jet oscillation process

    图 10  典型射流振荡过程的喷管壁面压力分布曲线

    Figure 10.  Pressure distribution curve on nozzle wall in a typical jet oscillation process

    图 12  PN3⁃9At测点压力幅值谱曲线

    Figure 12.  Amplitude spectrum curve of pressure at measuring point PN3⁃9At

    图 13  喷管壁面测点压力平均值与等熵解的对比

    Figure 13.  Comparison of average pressure of measuring point on nozzle wall and isentropic solution

    图 14  喷管壁面附着状态至流动分离的压力特征

    Figure 14.  Pressure characteristics of nozzle wall from adhesion state to flow separation

    表  1  水下超声速过膨胀燃气射流参数

    Table  1.   Parameters of underwater supersonic over⁃expanded gas jet

    测点H/mpa/MPaen
    1100.2500.40
    2300.4250.20
    3500.6170.14
    下载: 导出CSV
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  • 收稿日期:  2021-07-14

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