超压爆轰产物声速以及热力学CJ点的实验研究

超压爆轰产物声速是建立超压爆轰产物状态方程的基础性实验数据,而CJ点数据是反映炸药爆轰性能的重要参数。利用稀疏波追赶技术,通过光纤探针监测三氯甲烷中稀疏波追赶向前冲击波的过程,测量了不同压力点下JB-9014炸药超压爆轰产物的声速,得到了拉格朗日声速随粒子速度的变化曲线,由Lc线与稳定爆速D的交点确定了热力学CJ点,对JB-9014炸药所得到的CJ压力为28.8 GPa,与通常测量值28.5 GPa仅相差0.3 GPa。介绍了应用光纤探针测量爆轰驱动飞片的速度和平面性的方法,应用该方法得到了飞片的击靶速度和形状,此方法具有较高的测量精度。

Experimental Study on Sound-Speed of Overdriven-Detonation Product and the Thermodynamic CJ State

Sound-speed data of overdriven-detonation product are fundamental to model EOS, and CJ data are important to manifest detonation properties of explosive. Using rarefaction wave chasing technique, the sound-speeds in overdriven detonation product at different pressures are measured with optic-fiber probes, which are used to monitor the process of rarefaction wave chasing shock wave in the trichloromethane behind explosive. The thermodynamic CJ state is determined by the intersection point of the steady detonation velocity and the sound-speed line L_c. The thermodynamic CJ pressure is evaluated 28.8 GPa by this method. There is only a slight difference of 0.3 GPa between the thermodynamic CJ pressure and the ordinarily measured value 28.5 GPa. The method to measure velocity and planarity of detonation driving flyer with optic-fiber probes is also introduced. The velocity and planarity of the flyer are obtained using this method, which possesses good precision of measurement.