Explosion overpressure field of natural gas in a large-scaled confined vessel
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摘要: 以天然气体积分数在爆炸下限附近的天然气-空气混合物爆炸超压状态场为着眼点，在大尺寸容器中轴向和径向位置布置压力传感器，实时记录天然气体积分数不同的天然气-空气混合物爆炸后的超压发展过程。经过数据处理发现，在天然气爆炸下限附近，存在3种压力波形式且存在前导冲击波和二次发展形成的燃烧波共存的状态。不同天然气体积分数条件下爆炸压力沿容器轴向和径向发展过程存在明显差异，天然气爆炸径向超压变化不明显，轴向超压的发展趋势更适用于天然气爆炸发展过程的描述。Abstract: Focusing on the state of explosion overpressure field, a number of pressure transducers were installed in the axial and radial directions in the large-scale space. The explosion overpressure fields at different volume fractions of natural gas were recorded. When the volume fraction of natural gas was close to the lower limit of expolsion, three types of pressure curves existed. Former shock wave generated at the beginning of the explosion process was found as well with the further combustion wave. The developments in the axial and radial directions were found different obviously. Different from the instability of pressure in the radial direction, the overpressure development in the axial direction was more suitable to describe the whole developing process of overpressure.
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Key words:
- large-scaled /
- confined vessel /
- natural gas /
- explosion /
- overpressure
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图 3 天然气体积分数不同时的超压时程曲线
Figure 3. Overpressure-time curves at different volume fractions of natural gas
图 4 天然气体积分数为5.5%时压力传感器测得的爆炸超压曲线
Figure 4. Overpressure-time curves obtained by the pressure transducers at the volume fraction 5.5% of natural gas
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