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内置进气式粉末供给装置高压流化输送特性的数值分析

任冠龙 孙海俊 徐义华 胡晓安 李超

任冠龙, 孙海俊, 徐义华, 等. 内置进气式粉末供给装置高压流化输送特性的数值分析[J]. 航空动力学报, 2024, 39(8):20220595 doi: 10.13224/j.cnki.jasp.20220595
引用本文: 任冠龙, 孙海俊, 徐义华, 等. 内置进气式粉末供给装置高压流化输送特性的数值分析[J]. 航空动力学报, 2024, 39(8):20220595 doi: 10.13224/j.cnki.jasp.20220595
REN Guanlong, SUN Haijun, XU Yihua, et al. Numerical study on powder fluidization and conveying characteristics of powder supply device with built-in intake under high-pressure[J]. Journal of Aerospace Power, 2024, 39(8):20220595 doi: 10.13224/j.cnki.jasp.20220595
Citation: REN Guanlong, SUN Haijun, XU Yihua, et al. Numerical study on powder fluidization and conveying characteristics of powder supply device with built-in intake under high-pressure[J]. Journal of Aerospace Power, 2024, 39(8):20220595 doi: 10.13224/j.cnki.jasp.20220595

内置进气式粉末供给装置高压流化输送特性的数值分析

doi: 10.13224/j.cnki.jasp.20220595
基金项目: 国家自然科学基金(12102161); 航空科学基金(20200001056001)
详细信息
    作者简介:

    任冠龙(1999-),男,硕士,主要从事粉末发动机燃料输送方面的研究。E-mail:rglrenguanlong@163.com

    通讯作者:

    孙海俊(1987-),男,副教授,博士,主要从事粉末燃料发动机方面的研究。E-mail:sunhaij1987@163.com

  • 中图分类号: V435

Numerical study on powder fluidization and conveying characteristics of powder supply device with built-in intake under high-pressure

  • 摘要:

    针对粉末发动机中活塞驱动式燃料供给系统,设计了一种内置进气式供粉装置。基于欧拉-欧拉双流体模型,通过用户自定义函数实现活塞运动,建立了气体-粉末-活塞相互作用计算模型,开展了不同储箱内初始工作压力(0.6、1.2、1.8、2.4、3.0、3.6 MPa)对粉末燃料供给特性的数值研究。结果表明:不同初始工作压力下的气固分界面主要在进气口附近波动。随初始工作压力增大,粉末流量波动幅度降低,稳定输送阶段内的平均粉末流量更接近理论值,粉末层(粉末体积分数为0.1)面积波动幅度降低;在两相喷管喉道截面,固相平均体积分数随初始工作压力增大而增大,但拟颗粒温度的波动幅度随之减小。初始工作压力为3.6 MPa时的储箱内压力相比0.6 MPa能维持更长时间稳定,压力波动幅度降低了59.1%。

     

  • 图 1  粉末储箱的几何结构(单位:mm)

    Figure 1.  Geometric configuration of powder storage tank (unit:mm)

    图 2  粉末储箱的结构化六面体网格

    Figure 2.  Structured hexahedral mesh of powder storage tank

    图 3  网格无关性验证

    Figure 3.  Grid independency test

    图 4  数值计算模型验证

    Figure 4.  Simulation calculation model verification

    图 5  瞬时粉末分布的数值计算与实验结果对比

    Figure 5.  Comparison between numerical simulations and experimental results of instantaneous powder distribution

    图 6  出口粉末流量随时间的变化规律

    Figure 6.  Variation law of outlet powder flow rate with time

    图 7  出口平均粉末流量与理论值对比

    Figure 7.  Comparison of the mean outlet powder flow rate with the theoretical value

    图 8  出口粉末流量均方差对比

    Figure 8.  Comparison of the standard deviation of the outlet powder flow rate

    图 9  中心截面(Z = 0 m)处瞬时气固流型分布

    Figure 9.  Instantaneous gas-solid flow pattern distribution at the central section (Z = 0 m)

    图 10  粉末层(εp=0.1)的空间分布

    Figure 10.  Spatial distribution of powder layer (εp=0.1)

    图 11  粉末层面积随时间变化分布

    Figure 11.  Variable distribution of powder layer area with time

    图 12  粉末层面积的均方差分布

    Figure 12.  Standard deviation distribution of the powder layer area

    图 13  粉末体积分数变化和粉末云图分布

    Figure 13.  Area-averaged powder volume fraction variation and powder contour distribution

    图 14  不同轴向位置处的面平均拟颗粒温度分布

    Figure 14.  Area-averaged granular temperature distribution at different axial positions

    图 15  不同轴向位置处的拟颗粒温度均方差对比

    Figure 15.  Comparison of the standard deviation of the granular temperature at different axial positions

    图 16  不同工况粉末储箱内压力随时间的变化规律

    Figure 16.  Variation law of pressure in the tank with time under different cases

    图 17  不同工况粉末储箱内压力均方差对比

    Figure 17.  Comparison of the standard deviation of the pressure in the powder storage tank under different cases

    Cd 阻力系数 ds 固相直径,mm
    e 粒子碰撞的恢复系数 g 重力加速度,m/s2
    g0 径向分布函数 I 应力张量
    I2D 偏应力张量的第二不变量 p 压力,N/m2
    ps 固相压力,N/m2 Rg 气体常数,J/(mol·K)
    T 温度,K t 时间,s
    ug 气相速度,m/s us 固相速度,m/s
    Res 固相雷诺数 β 气相/固相动量交换系数,kg/(m3·s)
    $\gamma^{\varTheta}_{\mathrm{s}} $ 碰撞能量耗散,kg/(m3·s) $\varepsilon_{\mathrm{g}} $ 气相体积分数,%
    $\varepsilon_{\mathrm{s}} $ 固相体积分,% $\varepsilon_{\mathrm{s,max}} $ 固相最大打包极限,%
    $\varTheta_{\mathrm{s}} $ 拟颗粒温度,m2/s2 λg 气体体积黏度,Pa·s
    λs 固体体积黏度,Pa·s μg 气相剪切黏度,Pa·s
    μs 固相有效黏度,Pa·s μs,col 粉末碰撞黏度,Pa·s
    μs,fr 粉末摩擦黏度,Pa·s μs,kin 粉末动力黏度,Pa·s
    ρg 气相密度,kg/m3 ρs 固相密度,kg/m3
    τg 气相应力应变张量,N/m2 τs 固相应力应变张量,N/m2
    $\varPhi $ 内摩擦角,(°)
    下标
    g 气相 s 固相
    下载: 导出CSV

    表  1  计算工况

    Table  1.   Simulation cases

    工况 活塞速度/
    (mm/s)
    进气流量$ {\dot{m}}_{\mathrm{i}} $/
    (g/s)
    初始工作压力/
    MPa
    1 70 1(0.33%$ {\dot m_{{\text{pt}}}} $) 0.6
    2 1.2
    3 1.8
    4 2.4
    5 3.0
    6 3.6
    下载: 导出CSV

    表  2  计算条件参数

    Table  2.   Simulation condition parameters

    参数 数值
    颗粒粒径ds/mm 0.02
    初始粉末装填率ε 0.55
    最大粉末装填率εmax 0.63
    重力加速度g/(m/s2 9.81
    颗粒黏度μg/10−5 (Pa·s) 1.72
    颗粒密度ρs/(kg/m3 2719
    虚拟质量系数 0.5
    恢复系数e 0.9
    下载: 导出CSV
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  • 收稿日期:  2022-08-16
  • 网络出版日期:  2024-01-05

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