点火延迟时间对铝粉爆炸压力的影响研究

Effect of the Ignition Delay Time on the Explosion Pressure of Aluminum Dust

在实验室自行设计的水平管道式粉尘爆炸装置中,利用高压电极点火,在不同点火延迟时间对3种粒度铝粉的爆炸压力进行了实验研究.结果表明:随着点火延迟时间的增大,铝粉的最大爆炸压力和最大压力上升速率先增大后减小;存在一个最佳点火延迟时间使得最大爆炸压力和最大压力上升速率的值最大.而且铝粉粒度越大,最佳点火延迟时间越小.同时,还存在一个可爆延迟时间范围,随着铝粉粒度的改变,该延迟时间范围也会发生相应的变化.最后,从理论上对实验结果进行了定性分析.

The experimental study of aluminum dust explosion pressure with three kinds of size under different ignition delay time was made in the self-designed horizontal pipeline dust exploding device by utilizing high voltage electrode ignition. The results show that. with the increasing of ignition delay time, the explosion pressure and the rate of pressure rise of aluminum dust first enlarge and then reduce; there exists an optimum ignition delay time to maximize the explosion pressure and the rate of explosion pressure rise of aluminum dust; the larger the aluminum dust size is, the more the optimum ignition delay time diminution is; and there exists an explosion delay time range which changes with the variation of the aluminum dust size. At last, experimental results is qualitative investigated in theory.