动态超压工况下正拱开缝型爆破片的爆破性能研究

动态超压工况下的升压速率是影响爆破片爆破压力的一个重要因素,但目前对其影响规律还不清楚。搭建了可调节升压速率的爆破片动态爆破实验平台,以正拱开缝型爆破片为对象,对比采用无背压托架影响的单片结构与常见双片结构两种试件,研究了静态、不同升压速率动态工况下的爆破压力变化规律。结果表明,在静态工况下,单片结构与双片结构的正拱开缝型爆破片爆破压力基本一致;在动态超压工况下,爆破片爆破压力显著高于静态数值,且增高的幅度与升压速率有关。定义超压倍数为动态爆破压力与静态爆破压力的比值。超压倍数随着升压速率的增大而增加,其中双片结构的超压倍数远大于单片结构。本研究为预测动态工况下爆破片的爆破压力提供参考。

Study on Bursting Performance of Positive-arch Slotted Rupture Disc under Dynamic Overpressure Conditions

The rate of pressure increase under dynamic overpressure conditions is an important factor affecting the bursting pressure of rupture disc,but the influence law is still unclear.A dynamic bursting experiment platform for rupture disc with adjustable rate of pressure increase was set up.With the positive-arch slotted rupture disc as the object,and by comparing the monolithic structure without the influence of the back pressure bracket and the common two-piece structure,the variation law of bursting pressure under both static condition and dynamic condition of different rate of pressure increase was studied.The results show that under static operating conditions,the bursting pressure of the positive-arch slotted rupture disc of monolithic structure and that of two-piece structure are basically the same.Under dynamic overpressure conditions,the bursting pressure of the rupture disc is significantly higher than the static values and the amplitude of increase is related to the rate of pressure increase.The overpressure multiple is defined as the ratio of the dynamic bursting pressure to the static bursting pressure.The overpressure multiple increases with the increase of the rate of pressure increase and the overpressure multiple of the two-piece structure is much larger than that of the monolithic structure.This study provides a reference for predicting bursting pressure of bursting discs under dynamic conditions.