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混合物填充速度对火焰加速及DDT转变特性实验

张永辉 张启斌 赵明皓 王可 范明华 范玮

张永辉, 张启斌, 赵明皓, 等. 混合物填充速度对火焰加速及DDT转变特性实验[J]. 航空动力学报, 2024, 39(9):20220690 doi: 10.13224/j.cnki.jasp.20220690
引用本文: 张永辉, 张启斌, 赵明皓, 等. 混合物填充速度对火焰加速及DDT转变特性实验[J]. 航空动力学报, 2024, 39(9):20220690 doi: 10.13224/j.cnki.jasp.20220690
ZHANG Yonghui, ZHANG Qibin, ZHAO Minghao, et al. Experiment of the effect of mixture filling rate on flame acceleration and DDT transition characteristics[J]. Journal of Aerospace Power, 2024, 39(9):20220690 doi: 10.13224/j.cnki.jasp.20220690
Citation: ZHANG Yonghui, ZHANG Qibin, ZHAO Minghao, et al. Experiment of the effect of mixture filling rate on flame acceleration and DDT transition characteristics[J]. Journal of Aerospace Power, 2024, 39(9):20220690 doi: 10.13224/j.cnki.jasp.20220690

混合物填充速度对火焰加速及DDT转变特性实验

doi: 10.13224/j.cnki.jasp.20220690
基金项目: 国家自然科学基金(52176133,51876179,91441201)
详细信息
    作者简介:

    张永辉(1997-),男,博士生,主要从事爆震燃烧及爆震推进研究

    通讯作者:

    张启斌(1990-),男,副教授,博士,主要从事爆震燃烧及爆震推进研究。E-mail:zhangqibin@nwpu.edu.cn

  • 中图分类号: V231.2+2

Experiment of the effect of mixture filling rate on flame acceleration and DDT transition characteristics

  • 摘要:

    为研究脉冲爆震发动机中燃料/氧化剂混合物填充速度对火焰加速与缓燃向爆震转变过程(DDT)的影响,以乙烯为燃料、氧气体积分数为40%的富氧空气为氧化剂,进行了实验研究。采用不同的燃烧室构型、不同点火位置和不同的障碍物数量,在混合物填充速度为0、2.5、5.7、8.9 m/s和14.1 m/s的条件下,均成功获得充分发展的爆震波。结果表明:混合物填充速度越大,火焰发展也越快,对于能够起爆的工况,缓燃向爆震转变的时间最多可降低至填充速度为0 m/s时的38.9%;填充速度为8.9 m/s时,使火焰成功转变为爆震燃烧所需的障碍物数量由3对可减少为2对。提高混合物填充速度后,缩短DDT长度与点火段长度,依然能够成功建立爆震波,这对优化脉冲爆震发动机燃烧室构型,进而减少发动机长度和质量、提升推进性能具有一定的指导意义。

     

  • 图 1  实验系统示意图

    Figure 1.  Schematic of the experimental system

    图 2  爆震室示意图

    Figure 2.  Schematic of the detonation chamber

    图 3  爆震室(C)中轴线的速度分布

    Figure 3.  Velocity distribution along the central axis of the detonation chamber (C)

    图 4  高速摄像法测量火焰速度的原理及不确定度产生机理

    Figure 4.  Principle of flame velocity measurement by high-speed camera method and the mechanism of uncertainty generation

    图 5  爆震室内火焰发展(vf=0 m/s)

    Figure 5.  Flame development in the detonation chamber (vf=0 m/s)

    图 6  爆震室内火焰发展(vf=8.9 m/s)

    Figure 6.  Flame development in the detonation chamber (vf=8.9 m/s)

    图 7  火焰在光滑爆震室(A)内的传播速度

    Figure 7.  Velocity of flame propagation in the smooth detonation chamber (A)

    图 8  火焰在爆震室(B)内的传播速度发展(2对障碍物)

    Figure 8.  Velocity of flame propagation in the detonation chamber (B) (2 pairs of obstacles)

    图 9  火焰在爆震室(C)内的传播速度发展(3对障碍物)

    Figure 9.  Velocity of flame propagation in the detonation chamber (C) (3 pairs of obstacles)

    图 10  火焰在爆震室(D)内的传播速度发展(4对障碍物)

    Figure 10.  Velocity of flame propagation in the detonation chamber (D) (4 pairs of obstacles)

    图 11  爆震室中不同混合物填充速度下的tDDT

    Figure 11.  tDDT at a variety of gas velocity in the detonation chamber

    图 12  爆震室中不同混合物填充速度下的lDDT

    Figure 12.  lDDT at a variety of gas velocity in the detonation chamber

    图 13  不同填充速度对应的燃烧模态

    Figure 13.  Combustion modes for different filling rates

    图 14  不同点火位置下火焰传播速度发展

    Figure 14.  Velocity of flame propagation in different ignition location

    表  1  实验用爆震室尺寸

    Table  1.   Dimensions of the detonation chamber

    爆震室 d/mm l/mm l1/mm l2/mm l3/mm h/mm w/mm 障碍物个数
    A 25 600 25 140 0
    B 25 140 25 5 5 2
    C 25 140 25 5 5 3
    D 25 140 25 5 5 4
    C1 0 140 25 5 5 3
    C2 50 140 25 5 5 3
    C3 100 140 25 5 5 3
    下载: 导出CSV
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出版历程
  • 收稿日期:  2022-09-14
  • 网络出版日期:  2023-12-05

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