爆炸压力积聚工况下石松子粉尘爆炸火焰传播特性

搭建了一套兼具承压和可视性能粉尘爆炸实验平台,在压力积聚工况下实验研究了石松子粉尘爆炸火焰传播特性。实验结果表明:压力积聚工况下的石松子粉尘爆炸火焰呈现空间离散的束状结构,火焰锋面呈齿状。随着粉尘浓度的提升,火焰连续性增强,锋面趋于平滑,亮度增加,并在750g/m^3达到最佳。不同浓度条件下的石松子粉尘爆炸火焰在传播过程中均呈现明显的速度脉动特征,但脉动频率随粉尘浓度的增大而减小。爆炸火焰平均传播速度随粉尘浓度的增大先增大后减小,并在750g/m^3达到最高。不同浓度条件下的石松子粉尘爆炸火焰前期传播速度均高于后期传播速度。

Flame propagation characteristics of lycopodium dust explosion under explosion pressure accumulation conditions

An experimental setup which can withstand high pressure with good visibility was built. Flame propagation characteristics of lycopodium dust explosion were investigated under explosion pressure accumulation conditions. The experimental results showed that a space-dispersed fascicle-like flame structure was formed after the explosion of lycopodium dust under explosion pressure accumulation conditions. The flame front with a serrate structure was observed. However, on further increasing the dust concentration the flame continuity as well as the luminance increased and reached the top at the concentration of 750 g/m3. The velocity fluctuation during the flame propagation process of lycopodium dust explosion at different concentrations was found. But the fluctuation frequency decreased with the increase of dust concentration. The average flame propagation velocity increased and then decreased with the increase of dust concentration and reached the top at the dust concentration of 750 g/m3. The value of flame velocity was higher in the early stage, but lower in the later stage.