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离心喷嘴声学相关热试验频率分析与计算

张亚 潘刚 丁兆波 刘倩

张亚,潘刚,丁兆波,等.离心喷嘴声学相关热试验频率分析与计算[J].航空动力学报,2022,37(7):1478‑1486. doi: 10.13224/j.cnki.jasp.20210416
引用本文: 张亚,潘刚,丁兆波,等.离心喷嘴声学相关热试验频率分析与计算[J].航空动力学报,2022,37(7):1478‑1486. doi: 10.13224/j.cnki.jasp.20210416
ZHANG Ya,PAN Gang,DING Zhaobo,et al.Analysis and calculation of acoustic frequency of swirl injector in hot⁃fire testing[J].Journal of Aerospace Power,2022,37(7):1478‑1486. doi: 10.13224/j.cnki.jasp.20210416
Citation: ZHANG Ya,PAN Gang,DING Zhaobo,et al.Analysis and calculation of acoustic frequency of swirl injector in hot⁃fire testing[J].Journal of Aerospace Power,2022,37(7):1478‑1486. doi: 10.13224/j.cnki.jasp.20210416

离心喷嘴声学相关热试验频率分析与计算

doi: 10.13224/j.cnki.jasp.20210416
详细信息
    作者简介:

    张亚(1983-),男,高级工程师,硕士,主要从事氢氧火箭发动机和燃料电池设计、仿真等研究工作。

  • 中图分类号: V434.1

Analysis and calculation of acoustic frequency of swirl injector in hot⁃fire testing

  • 摘要:

    针对采用离心喷嘴的氢氧预燃室,基于高频脉动压力的热试验数据,对比了试验频率的变化趋势和与之相关的主要测试参数的变化规律,初步推测影响热试验频率的根本因素是离心喷嘴内部液膜的声速和燃烧室压力。发展形成了基于声学理论计算喷嘴频率的半经验公式,使用喷前压力和修正了的液氧温度查询声速计算的喷嘴频率。半经验公式的计算结果与试验实测频率吻合很好,分析认为类似管路声学频率计算的半经验公式同样适用于离心喷嘴。声学频率决定了离心喷嘴液膜主导表面波波长的初始值,主导表面波流动所受气体阻力随压力及液膜速度升高而增大使其波长减小,液膜一次破碎的频率升高,可能是热试验频率与燃烧室压力正相关的影响机制。

     

  • 图 1  离心喷嘴结构尺寸及热试验测点示意

    Figure 1.  Schematic diagram of swirl injector dimension and measuring points of hot⁃fire testing

    图 2  氧头腔高频压力频谱图

    Figure 2.  Frequency spectrums of pressure of the oxygen mainifold

    图 3  燃烧室高频压力频谱图

    Figure 3.  Frequency spectrums of pressure of the combustion chamber

    图 4  燃气温度与试验频率对比

    Figure 4.  Temperature of combustion and testing frequency

    图 5  燃烧室压力与试验频率对比

    Figure 5.  Pressure of combustion chamber and testing frequency

    图 6  氧头腔压力与试验频率对比

    Figure 6.  Pressure of oxygen mainifold and testing frequency

    图 7  氢喷嘴压降与试验频率对比

    Figure 7.  Pressure drop of hydrogen annulus and testing frequency

    图 8  氧喷嘴压降与试验频率对比

    Figure 8.  Pressure drop of oxygen swirl injector and testing frequency

    图 9  液氧声速与试验频率对比

    Figure 9.  Sound speed of liquid oxygen and testing frequency

    图 10  离心喷嘴内部流动示意

    Figure 10.  Internal flow scheme of swirl injector

    图 11  Twio计算离心喷嘴声学频率与试验频率对比

    Figure 11.  Acoustic frequency with Twio of swirl injector and testing frequency

    图 12  离心喷嘴出口轴向速度分布

    Figure 12.  Axial velocity distribution at outlet of swirl injector

    图 14  修正液氧温度后计算得到的喷嘴频率和试验频率

    Figure 14.  Acoustic frequency with modified temperature of swirl injector and testing frequency

    图 15  热试验频域曲线(t=4.5~5 s)

    Figure 15.  Frequency spectrums of hot⁃fire testing(t=4.5~5 s)

    图 16  不同长度取值计算频率与提取频率对比

    Figure 16.  Acoustic frequency with different length of swirl injector and testing frequency

    图 17  计算喷嘴频率与热试验频谱图

    Figure 17.  Calculated frequenciy of swirl injector and spectrums of hot⁃fire testing

    表  1  离心喷嘴几何尺寸

    Table  1.   Geometrical parameters of the swirl injector

    参数数值
    氧喷嘴长度L0/mm59.8
    切向孔中心与出口距离L1/mm56.8
    切向孔直径dt/mm1.5
    切向孔中心长度Lt/mm3.02
    氧喷嘴缩进比Lr/d0.85
    下载: 导出CSV

    表  2  热试验测点

    Table  2.   Measuring point parameters of hot⁃fire testing

    参数采样频率/kHz
    气蚀管前压力pwio1
    气蚀管前温度Twio1
    氧头腔压力pio1
    氧头腔高频速变压力pio,d50
    氧头腔温度Tio1
    燃烧室压力pc1
    燃烧室高频速变压力pc,d50
    燃烧室温度Tc1
    下载: 导出CSV
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  • 收稿日期:  2021-08-04

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