高压环境条件下煤矿瓦斯爆炸特性数值模拟
Numerical Simulation of Gas Explosion Characteristics Under High Pressure Environment
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摘要: 环境压力对瓦斯爆炸特性有明显影响。针对处于高压环境的瓦斯气体爆炸特性，运用流场模拟软件对瓦斯爆炸过程进行数值模拟，对爆炸过程中的压力场、温度场和速度场进行分析。数值模拟结果表明：当环境压力为2.0 MPa范围内时，最大爆炸压力随着环境压力的升高成倍增加；随着初始环境压力的增大，各测点火焰的到达时间相应变短，爆炸温度也同比升高；初期燃烧过程受环境压力影响明显，在前20 ms内，燃烧速度随环境压力的升高先下降后上升，而终态燃烧速度基本一致。Abstract: The environmental pressure has obvious influence on gas explosion. The simulation of gas explosion was carried out to analyze the pressure field, velocity field and temperature field by flow field platform under high pressure environment. According to the simulation results, the maximum explosion pressure increases exponentially with increasing of environmental pressure at the range of 2.0 MPa. With the increase of the initial pressure of the environment, the time of flame arrival is shorter, and the explosion temperature is increased. With environmental pressure increasing, the flame burning velocity is decreased and then increased within 20 ms, but the final state is consistent with different initial pressure.
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Keywords:
- gas explosion /
- environmental pressure /
- explosion pressure /
- flame temperature /
- burning rate /
- density /
- flow field
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