泄爆条件对管内气粉两相混合体系燃爆特性的影响

朱文艳 汪泉 张军 徐小猛 方敬贤 李雪交

朱文艳, 汪泉, 张军, 徐小猛, 方敬贤, 李雪交. 泄爆条件对管内气粉两相混合体系燃爆特性的影响[J]. 爆炸与冲击, 2024, 44(7): 075402. doi: 10.11883/bzycj-2024-0024
引用本文: 朱文艳, 汪泉, 张军, 徐小猛, 方敬贤, 李雪交. 泄爆条件对管内气粉两相混合体系燃爆特性的影响[J]. 爆炸与冲击, 2024, 44(7): 075402. doi: 10.11883/bzycj-2024-0024
ZHU Wenyan, WANG Quan, ZHANG Jun, XU Xiaomeng, FANG Jingxian, LI Xuejiao. Influence of explosion venting conditions on the deflagration characteristics of gas-powder two-phase mixture system in pipe[J]. Explosion And Shock Waves, 2024, 44(7): 075402. doi: 10.11883/bzycj-2024-0024
Citation: ZHU Wenyan, WANG Quan, ZHANG Jun, XU Xiaomeng, FANG Jingxian, LI Xuejiao. Influence of explosion venting conditions on the deflagration characteristics of gas-powder two-phase mixture system in pipe[J]. Explosion And Shock Waves, 2024, 44(7): 075402. doi: 10.11883/bzycj-2024-0024

泄爆条件对管内气粉两相混合体系燃爆特性的影响

doi: 10.11883/bzycj-2024-0024
基金项目: 国家自然科学基金(11872002);煤炭安全精准开采国家地方联合工程研究中心开放基金(EC2023024)
详细信息
    作者简介:

    朱文艳(1999- ),女,硕士,17679490916@163.com

    通讯作者:

    汪 泉(1980- ),男,博士,教授,博士生导师,wqaust@163.com

  • 中图分类号: O383; TQ560.7

Influence of explosion venting conditions on the deflagration characteristics of gas-powder two-phase mixture system in pipe

  • 摘要: 为探究气粉两相混合体系泄爆特性变化规律,以甲烷-硝酸铵为实验介质,利用自行搭建的不锈钢火焰加速管道开展了泄爆口不同静态动作压力(pst)的燃爆实验,着重研究了pst对气粉两相燃爆压力、火焰传播速度和泄爆火焰形态的影响规律。pst由泄爆口阻塞比(θ)和泄爆膜层数(n)决定,θn增大的共同作用使pst升高。pst升高将增强管道对气粉和反应产物冲出管外的约束,增大管内流体的黏滞效应,促进管内气粉两相反应,降低未燃气在管外二次爆炸的强度。对爆燃压力进行分析,发现pst从2.97 kPa升高至14.64 kPa时,爆燃压力时程曲线呈含维稳平台的双峰结构。第一压力峰值从5.48 kPa增大至10.20 kPa,维稳时间从6 ms延长至25 ms,第二压力峰值从23.03 kPa减小至9.71 kPa;pst为16.08 和24.12 kPa时,破膜前压力多次叠加反射,致使泄爆膜压力时程曲线呈特殊振荡上升的三峰结构。对火焰传播速度进行分析,发现pst升高使火焰的平均传播速度从161.33 m/s降低至67.99 m/s。对泄爆火焰进行分析,发现当n=2时,θ增大将使泄爆火焰结构由簇状转变为射流状;θ=88.9%时,泄爆火焰呈典型的射流状。θ增大和n增大均使火焰亮度逐渐降低,火焰发光区长度减小,破膜至火焰出现时间间隔和火焰持续时间延长。
  • 图  1  实验测试系统示意图

    Figure  1.  Schematic diagram of the experimental system

    图  2  空心法兰照片

    Figure  2.  Hollow flanges

    图  3  静态动作压力测试结果拟合曲线

    Figure  3.  Fitting curves of static action pressure test results

    图  4  硝酸铵的表面形貌

    Figure  4.  Surface morphology of NH4NO3

    图  5  θ=0%条件下不同n工况的压力时程曲线

    Figure  5.  Pressure-time history curves under different working conditions of n at θ=0%

    图  6  θ=55.6%条件下不同n工况的压力时程曲线

    Figure  6.  Pressure-time history curves of different working conditions of n at θ=55.6%

    图  7  θ=88.9%条件下不同n工况的压力时程曲线

    Figure  7.  Pressure-time history curves of different working conditions of n at θ=88.9%

    图  8  2.97 kPa≤pst≤14.64 kPa时pp1pst的关系

    Figure  8.  Relationship between pp1 and pst when 2.97 kPa≤pst≤14.64 kPa

    图  9  各工况火焰传播速度在管道中的变化曲线

    Figure  9.  Variation curves of flame propagation velocity in the pipeline under different working conditions

    图  10  各工况火焰平均传播速度变化趋势

    Figure  10.  Variation trend of average flame propagation velocity under different conditions

    图  11  n=2时,θ=0%、55.6%和88.9%瞬态泄爆火焰结构

    Figure  11.  Transient burst flame structures under the conditions of n=2 and θ=0%, 55.6%, and 88.9%, respectively

    图  12  θ=88.9%条件下,n=1、2和3瞬态泄爆火焰结构

    Figure  12.  Transient burst flame structures under the conditions of θ=88.9% and n=1, 2, and 3, respectively

    表  1  泄爆口径与阻塞比的关系

    Table  1.   Relationship between blasting aperture and blocking ratio

    D/mm SC/cm2 θ/%
    120 0 0
    80 249.33 55.6
    40 400.12 88.9
    下载: 导出CSV

    表  2  静态动作压力测试结果

    Table  2.   Test results of static action pressure

    n pst/kPa
    D=120 mm D=80 mm D=40 mm
    1 3.25 5.20 9.16
    2 6.36 9.61 18.96
    3 9.16 14.62 22.28
    4 16.51 19.25 31.82
    下载: 导出CSV

    表  3  静态动作压力计算模型预测结果

    Table  3.   Results predicted by static action pressure calculation model

    n pst/kPa
    D=120 mm D=80 mm D=40 mm
    1 2.97 4.88 8.04
    2 5.94 9.70 16.08
    3 8.91 14.64 24.12
    下载: 导出CSV
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出版历程
  • 收稿日期:  2024-01-10
  • 修回日期:  2024-03-25
  • 网络出版日期:  2024-03-29
  • 刊出日期:  2024-07-05

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