中文摘要：

为进一步研究影响粉尘爆炸特性参数的因素,在5L柱形密闭爆炸容器中,以食用玉米淀粉为试样,利用高压放电火花点火,并通过压力采集系统记录容器内压力的变化,研究了不同吹粉压力下,点火延迟时间对粉尘爆炸压力参数的影响,并对实验现象进行了理论分析。实验结果表明：点火延迟时间对粉尘爆炸压力和压力上升速率影响显著;吹粉压力存在一个临界值,当吹粉压力大于临界值时,存在一个最佳点火延迟时间,使得爆炸压力峰值和压力上升速率峰值最大,且随着吹粉压力的增大,粉尘爆炸的最佳点火延迟时间缩短;当吹粉压力小于临界值时,点火延迟时间越长,粉尘爆炸压力越小。

英文摘要：

Dust explosion experiments were carried out in a 5 L closed cylindrical vessel using corn- starch dispersed with compressed air and ignited by high-voltage spark, for further study of the factors which affect the dust explosion parameters. With different dispersion pressure, the influence of ignition delay time on the pressure parameters of dust explosion was studied, and the experimental results were analyzed theoretically. The results show that the influence of ignition delay time on explosion pressure and rise rate of pressure is significant,a critical value of dispersion pressure is found. When dispersion pressure is higher than the critical pressure, there is an optimum ignition delay time, making the explosion pressure and pressure rise rate maximal. With the increasing of dispersion pressure,the optimum ignition delay time decreases. When dispersion pressure is lower than the critical pressure, the pressure of dust explosion rises as the ignition delay time increases.