甲烷-空气预混气体泄爆作用下容器振动响应特性  

Analysis of vibration response characteristics of explosive vessels during methane-air mixtures explosion

作　　者：唐泽斯 郭进 张苏[1] 王金贵[1] TANG Zesi;GUO Jin;ZHANG Su;WANG Jingui(College of Environment and Resources,Fuzhou University,Fuzhou,Fujian 350108,China)

机构地区：[1]福州大学环境与资源学院,福建福州350108

出　　处：《福州大学学报（自然科学版）》2020年第2期263-268,共6页Journal of Fuzhou University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(51704079,51604083);福建省教育厅科研资助项目(JAT170057);福州大学贵重仪器设备开放测试基金资助项目(2019T007)。

摘　　要：利用自主搭建的气体泄爆容器动态力学响应测试系统,研究甲烷-空气预混气体泄爆过程中实验舱的振动响应特性,并结合舱内部超压、火焰演化和实验舱固有频率等特征,探讨前述实验舱动态力学的响应机制.研究发现:1)泄爆过程中实验舱动态力学响应存在明显的双峰现象,且两者的幅值、频谱均存在较大差异;2)低幅值振动与舱内气体冲击波特征密切相关,其主要由初始火焰传播、外部爆炸、亥姆霍兹振荡和泰勒不稳定性等因素综合影响导致;3)480和980 Hz的高幅值振动主要为舱内声波和火焰耦合作用触发高频振荡导致;而1100 Hz左右的高幅值振动主要为受冲击后实验舱的自由振动,由舱固有频率决定.The vibration response characteristics of the experimental cabin during the methane-air mixtures blasting process were studied by self-built methane blasting dynamic mechanical response test system.The dynamic mechanical response mechanism of the experimental cabin was discussed by combining the internal pressure of the cabin,the evolution of the flame and the natural frequency of the experimental cabin.The conclusions of the study are as follows:①There was a significant double-peak phenomenon in the dynamic mechanical response of the experimental cabin during the methane-air mixtures blasting process,and the amplitudes of the two had large differences;the main frequencies of the low amplitude vibration were 110 and 480 Hz,and the high amplitude.The main frequencies of vibration were 480,980 and 1100 Hz.②Low amplitude vibration was closely related to the characteristics of gas shock wave in the cabin,which was mainly caused by the combination of initial flame propagation,external explosion,Helmholtz oscillation and Taylor instability.③The high amplitude vibrations of 480 and 980 Hz were mainly affected by the gas shock wave in the cabin,which was caused by the high frequency oscillation triggered by the acoustic wave and flame coupling in the cabin;and the high amplitude vibration around 1100 Hz was mainly the freedom of the experimental cabin after the impact.Vibration,which was determined by the natural frequency of the cabin.

关 键 词：甲烷泄爆 爆炸容器 振动响应 压力震荡 频谱 

分 类 号：X932[环境科学与工程—安全科学]