摘要
为探究CO_(2)抑爆剂在实际场景中抑制氢燃爆的性能,利用定容燃烧弹开展了封闭空间中不同CO_(2)掺混比下H 2-空气-CO_(2)湍流混合气的爆炸燃烧实验,获得了爆炸燃烧特征参数,并系统分析了CO_(2)添加量和湍流强度对混合气的影响规律,建立了爆燃指数依赖于压力上升时间的经验公式。结果表明:随着CO_(2)掺混比增大,火焰传播速度和混合气总能量均减小,爆炸压力和压力上升强率均显著降低,当CO_(2)掺混比从0增加30%时,爆炸压力降低32.6%,最大压力上升速率降低77.7%;热损失基本不变,导致绝热压力与实验最大爆炸压力之差几乎不变;在当量比和CO_(2)掺混比固定的条件下,随着湍流加剧,最大爆炸压力变化不大,而最大爆炸压力升高率明显增大,热损失减小,绝热压力与实验最大爆炸压力之间的差减小,其中,当量比为1.0、CO_(2)掺混比为30%、湍流强度从0提升到2.715 m/s时,最大压力升高率增大179%,绝热压力与实验最大爆炸压力之间的差降低7.2%;随着湍流强度增大,CO_(2)的抑爆性能减弱。
To investigate the performance of CO_(2)as a flame suppressant in practical hydrogen deflagration scenarios,experiments are conducted in a constant-volume combustion chamber to study the explosion and combustion characteristics of H 2-air-CO_(2)turbulent mixtures with varying CO_(2)fractions in a confined space.Explosion combustion parameters are obtained,and the effects of CO_(2)concentration and turbulence intensity are systematically analyzed.An empirical formula linking the deflagration index to pressure rise time is established.The results show that increased CO_(2)fraction reduces both flame propagation speed and total mixture energy,leading to significant decreases in explosion pressure and pressure rise rate.When CO_(2)fraction increases from 0% to 30%,explosion pressure decreases by 32.6%,and maximum pressure rise rate decreases by 77.7%.Heat loss remains largely unchanged,resulting in negligible variation between adiabatic pressure and experimental maximum explosion pressure.Under constant equivalence ratio and CO_(2)fraction,increased turbulence intensity has little effect on maximum explosion pressure,while the maximum pressure rise rate increases significantly,and heat loss decreases,reducing the difference between adiabatic pressure and experimental maximum explosion pressure.For example,at an equivalence ratio of 1.0 and CO_(2)fraction of 30%,as turbulence velocity increases from 0 to 2.715 m/s,maximum pressure rise rate increases by 179%,and the difference between adiabatic pressure and experimental maximum explosion pressure decreases by 7.2%.Higher turbulence intensity weakens the flame suppression effectiveness of CO_(2).
作者
杨衣兰
李倩倩
王婧
曹迅
刘虎
黄佐华
YANG Yilan;LI Qianqian;WANG Jing;CAO Xun;LIU Hu;HUANG Zuohua(State Key Laboratory of Multiphase Flow in Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China)
出处
《西安交通大学学报》
北大核心
2026年第3期67-76,共10页
Journal of Xi'an Jiaotong University
基金
国家自然科学基金资助项目(U24B6017)
国家重点研发计划资助项目(2024YFE0211500)。
关键词
氢气
湍流强度
CO_(2)
爆炸燃烧特性
经验公式
hydrogen
turbulence intensity
CO_(2)
explosion and combustion characteristic
empirical correlation
