航空学报 > 2025, Vol. 46 Issue (4): 130940-130940   doi: 10.7527/S1000-6893.2024.30940

填充流量和当量比对障碍物管道内火焰加速的影响

张浩天1, 张永辉1, 马鹏飞1,2, 王云3, 范玮1()   

  1. 1.西北工业大学 动力与能源学院,西安 710129 2.西安航空学院 飞行器学院,西安 710077
    3.西北工业集团有限公司,西安 710043
  • 收稿日期:2024-07-15 修回日期:2024-08-01 接受日期:2024-08-26 出版日期:2024-09-03 发布日期:2024-09-02
  • 通讯作者: 范玮 E-mail:weifan419@nwpu.edu.cn
  • 基金资助:
    国家自然科学基金(52176133)

Effects of filling flow rate and equivalence ratio on flame acceleration in an obstacle channel

Haotian ZHANG1, Yonghui ZHANG1, Pengfei MA1,2, Yun WANG3, Wei FAN1()   

  1. 1.School of Power and Energy,Northwestern Polytechnical University,Xi’an 710129,China
    2.School of Aircraft,Xi’an Aeronautical Institute,Xi’an 710077,China
    3.Northwest Industries Group Co. ,Ltd,Xi’an 710043,China
  • Received:2024-07-15 Revised:2024-08-01 Accepted:2024-08-26 Online:2024-09-03 Published:2024-09-02
  • Contact: Wei FAN E-mail:weifan419@nwpu.edu.cn
  • Supported by:
    National Natural Science Foundation of China(52176133)

摘要:

火焰在爆震室内的传播特性对缓燃向爆震转变过程至关重要。为探究填充流量和当量比对安装矩形障碍物的爆震室内火焰加速的影响,采用乙烯为燃料、空气为氧化剂,基于高速纹影技术和化学自发光技术,通过实验研究的方式,获得了不同填充流量和当量比的纹影图像和火焰自发光图像。实验结果表明,火焰在矩形障碍物管道内传播时可分为缓慢加速和振荡加速两个阶段;适度增加填充流量会加速层流火焰向湍流火焰转变,显著促进火焰加速过程;但进一步增加填充流量并不会持续加速火焰传播,最大火焰传播速度在650~700 m/s范围内波动;当反应物当量比为1时,火焰加速效果明显优于偏贫或偏富的工况;随着反应物填充流量的增大,当量比对火焰加速的影响逐渐减弱。

关键词: 爆震, 障碍物管道, 火焰加速, 填充流量, 当量比

Abstract:

The propagation characteristics of flame in an obstructed tube are crucial to the transition from slow combustion to detonation. To explore the influence of filling flow rate and equivalence ratio on flame acceleration in a rectangular obstructed tube, ethylene was used as fuel, and air was used as oxidant. Based on high-speed schlieren technology and chemiluminescence technology, schlieren images and flame chemiluminescence images with different filling flow rates and equivalence ratios were obtained through experimental research. The experimental results show that the flame propagation in a rectangular channel with obstacles can be divided into two stages: slow acceleration and oscillating acceleration. Moderately increasing the filling flow rate will accelerate the transition from laminar flame to turbulent flame, and significantly promote the flame acceleration process. However, further increasing the filling flow rate will not continuously accelerate the flame propagation, and the maximum flame propagation speed fluctuates in the range of 650 m/s to 700 m/s. When the equivalence ratio of reactants is 1, the flame acceleration effect is obviously better than that of lean or rich conditions. As the filling flow rate increases, the effect of equivalence ratio on flame acceleration gradually weakens.

Key words: detonation, obstacle channel, flame acceleration, filling flow rate, equivalence ratio

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